Liabilities / Assets
36th percentile
Higher debt load relative to assets than 36% of similar nonprofits.
EIN 36-6162709 • 501(c)3 • Lake Forest, IL
Profile
Since its establishment in 1967, the association has acquired, preserved and maintained over 800 acres of local native landscapes including prairies, savannas, ravines, woodlands and wetlands for the benefit and enjoyment of the entire community. We continue our efforts to restore the land to its historical landscape and maintain these critical habitats. In addition, to promote a connection between the community and the land within it, our preserves are home to over 12 miles of walking trails which are open to the public year round.the association also provides naturalist-led environmental education to school children and special workshops offered to children, adults and families. Our environmental education programs are designed to develop an understanding of and a love and respect for the natural world around us by including hands-on, participatory activities in a natural setting. Association also cooperates with several institutions promote the scientific study of our preserves.
Precomputed percentiles relative to similar nonprofits. These scores are descriptive rather than judgmental.
Liabilities / Assets
36th percentile
Higher debt load relative to assets than 36% of similar nonprofits.
Liabilities / Revenue
78th percentile
Higher debt load relative to revenue than 78% of similar nonprofits.
Net Margin
94th percentile
Higher net margin than 94% of similar nonprofits.
Top Officer Pay
Score unavailable
No filing with officer rows is available for this organization yet.
Asset Growth
54th percentile
Faster asset growth than 54% of similar nonprofits.
Revenue Growth
25th percentile
Faster revenue growth than 25% of similar nonprofits.
Assets
Up$82,361,192
Up $6,047,810 (+7.9%) from 2024
Liabilities
Up$10,261,935
Up $80,949 (+0.8%) from 2024
Net Assets
Up$72,099,257
Up $5,966,861 (+9.0%) from 2024
Revenue
Up$8,902,765
Up $4,711,264 (+112%) from 2024
Expenses
Up$2,754,868
Up $238,683 (+9.5%) from 2024
Net Income
Up$6,147,897
Up $4,472,581 (+267%) from 2024
Most recent year
2025 • Form 990Facts available. Structured filing facts are available, but richer extracted sections are limited.
Since its establishment in 1967, the association has acquired, preserved and maintained over 800 acres of local native landscapes including prairies, savannas, ravines, woodlands and wetlands for the benefit and enjoyment of the entire community. We continue our efforts to restore the land to its historical landscape and maintain these critical habitats. In addition, to promote a connection between the community and the land within it, our preserves are home to over 12 miles of walking trails that are open to the public year round.the association also provides naturalist-led environmental education to school children and special workshops to children, adults and families. Our environmental education programs are designed to develop an understanding of and a love and respect for the natural world around us by including hands-on, participatory activities in a natural setting. The association also promotes the scientific study of our preserves.
The preservation and maintenance of open lands, to promote a connection between the community and the land within and to provide naturalist-led environmental engagement to school children and special workshops to children, adults and families.
| Line | Beginning | End | Change |
|---|---|---|---|
| Assets | |||
| Land, Buildings, and Equipment, Net | $43,499,962 | $50,955,540 | ▲ $7,455,578 |
| Investments Other Securities | $21,545,884 | $22,304,169 | ▲ $758,285 |
| Savings and Temporary Cash Investments | $8,346,845 | $6,377,803 | ▼ $1,969,042 |
| Pledges and Grants Receivable | $1,024,047 | $1,291,379 | ▲ $267,332 |
| Cash and Non-Interest-Bearing Accounts | $516,365 | $532,490 | ▲ $16,125 |
| Other Notes and Loans Receivable, Net | $460,864 | - | - |
| Prepaid Expenses and Deferred Charges | $89,723 | $81,566 | ▼ $8,157 |
| Accounts Receivable | $37,997 | $31,671 | ▼ $6,326 |
| Total Assets | $76,313,382 | $82,361,192 | ▲ $6,047,810 |
| Other Assets Total | $791,695 | $786,574 | ▼ $5,121 |
| Liabilities | |||
| Tax Exempt Bond Liabilities | $9,946,690 | $9,952,402 | ▲ $5,712 |
| Deferred Revenue | $77,892 | $135,080 | ▲ $57,188 |
| Accounts Payable and Accrued Expenses | $111,209 | $134,379 | ▲ $23,170 |
| Other Liabilities | $45,195 | $40,074 | ▼ $5,121 |
| Total Liabilities | $10,180,986 | $10,261,935 | ▲ $80,949 |
| Net Assets / Fund Balance | |||
| Net Assets Without Donor Restrictions | $46,901,379 | $53,154,552 | ▲ $6,253,173 |
| Net Assets With Donor Restrictions | $19,231,017 | $18,944,705 | ▼ $286,312 |
| Total Net Assets Fund Balance | $66,132,396 | $72,099,257 | ▲ $5,966,861 |
| Total Liabilities and Net Assets / Fund Balance | $76,313,382 | $82,361,192 | ▲ $6,047,810 |
| Asset | Book Value | Depreciation | Basis |
|---|---|---|---|
| Land | $42,792,687 | - | $42,792,687 |
| Other Land Buildings | $8,028,786 | $2,505,624 | $10,534,410 |
| Equipment | $134,067 | $755,605 | $889,672 |
| Other Securities | $16,892,498 | - | - |
| Period | Beginning | Contrib. | Gain/Loss | Other Uses | End |
|---|---|---|---|---|---|
| 2024 | $23,346,690 | $1,637,477 | - | $1,393,135 | $23,591,032 |
| 2023 | $21,732,251 | $2,215,323 | - | $600,884 | $23,346,690 |
| 2022 | $17,904,005 | $5,718,446 | - | $1,890,200 | $21,732,251 |
| 2021 | $18,639,174 | $1,347,419 | - | $2,082,588 | $17,904,005 |
| 2020 | $15,002,627 | $3,941,501 | - | $304,954 | $18,639,174 |
| Name | Title | Full / Part Time | Base | Other | Total |
|---|---|---|---|---|---|
| Ryan G London | President | FT | $160,925 | $755 | $161,680 |
| Paula Clair-gould | Vice President - Developme | FT | $126,079 | - | $126,079 |
| John Hemenway | Controller | FT | $102,097 | - | $102,097 |
| Name | Title |
|---|---|
| Brett L Paschke | Chairman |
| James F Dean | Vice-chair |
| Melissa Goltra | Vice-chair |
| Steven H Baer | Vice President & Treasurer |
| Amy Rogers | Director |
| Kim Madden | Director |
| Lois Morrison | Director |
| Margaret Jessen Kelley | Director |
| Marion Searle | Director |
| Mark T Ahern | Director |
| Matt Sunderman | Director |
| Matthew Claeys | Director |
| Miah Armour | Director |
| Paula L Preschlack | Director |
| George M Covington | Secretary |
| Contractor | Services | Location | Compensation |
|---|---|---|---|
| Res Great Lakes LLC | Land Restoration | 6575 WEST LOOP SOUTH SUITE 300, Bellaire, TX 77401 | $254,025 |
| Liberty Prairie Restorations | Land Maintenance | 928 BARTLETT TERRACE, Libertyville, IL 60048 | $107,423 |
| Contribution Type | Contribution Count | Reported Amount | Valuation Method |
|---|---|---|---|
| Securities Publicly Traded | 7 | $100,206 | Fair Market Value |
| Other Non Cash Contri Table | 5 | $95,994 | Fair Market Value |
| Other Non Cash Contri Table | 1 | $30,000 | Fair Market Value |
| Total Noncash Contributions | 13 | $226,200 | - |
| Line Item | Amount |
|---|---|
| Other Expenses | $1,523,538 |
| Salaries, Compensation, and Employee Benefits | $1,231,330 |
| Total Fundraising Expense | $268,961 |
| Grants and Similar Amounts Paid | $0 |
| Professional Fundraising Fees | $0 |
| Line Item | Program | Management | Fundraising | Total |
|---|---|---|---|---|
| Other Salaries and Wages | $722,580 | $81,160 | $145,078 | $948,818 |
| Interest | $284,781 | - | - | $284,781 |
| Depreciation Depletion | $211,562 | $5,567 | $5,567 | $222,696 |
| Current Officers, Directors, Trustees, and Key Employees | $69,704 | - | $34,898 | $104,602 |
| All Other Expenses | $71,801 | $13,117 | $17,741 | $102,659 |
| Other Employee Benefits | $74,120 | $7,593 | $16,837 | $98,550 |
| Other Expenses | $86,012 | $22,005 | $10,522 | $86,012 |
| Payroll Taxes | $59,687 | $6,114 | $13,559 | $79,360 |
| Insurance | $63,029 | $12,776 | $852 | $76,657 |
| Fees for Services Accounting | $34,435 | - | $1,903 | $36,338 |
| Fees for Services Legal | $10,765 | - | - | $10,765 |
| Occupancy | $6,600 | - | - | $6,600 |
| Total Functional Expenses | $2,337,575 | $148,332 | $268,961 | $2,754,868 |
| Line Item | Amount |
|---|---|
| Total Expenses per Audited Statements | $3,026,763 |
| Expenses per Audited Statements | $2,754,868 |
| Total Expenses per Form 990 | $2,754,868 |
| Expenses Not Reported on Form 990 | $271,895 |
| Expenses Not Reported on Financial Statements | $0 |
| Line Item | Amount |
|---|---|
| Fundraising Direct Expenses | $271,895 |
| Fundraising Gross Income | $117,199 |
| Professional Fundraising Fees | $0 |
| Event | Gross Receipts | Gross Revenue | Direct Expenses | Net Income |
|---|---|---|---|---|
| Cattails & Cocktails | $126,566 | - | $25,489 | - |
| Bagpipes and Bonfire | $426,942 | $117,199 | $95,336 | $21,863 |
| Total Events | $570,242 | $117,199 | $271,895 | $-154,696 |
| Interested Party | Relationship | Description | Shared Revenue | Amount |
|---|---|---|---|---|
| George Covington | Member of the Board of Directors | Legal Services | No | $10,764 |
| Liability | Amount |
|---|---|
| Lease Liabilities | $40,074 |
| Bond | Issuer | Issued | Issue Price | Purpose |
|---|---|---|---|---|
| A | Northern Trust | 2017-01-26 | $10,000,000 | Refunding and redeeming all of its series 1999 bonds |
| Bond | Total Proceeds | Spent | Retired | Issuance Costs |
|---|---|---|---|---|
| A | $10,000,000 | $10,000,000 | - | - |
“The board of directors has delegated the responsibility of the review and approval of the form 990 to the audit committee. The audit committee does a complete review of the form 990 with the cpa firm and approves the filing of the form 990. The chairman of the audit committee reports the committees procedures and approval process of the form 990 to the board of directors.”
“The board of directors and officers are required on an annual basis to submit a statement of their status regarding the conflict of interest policy.”
“The executive committee of the board of directors obtains comparative compensation reports for executive directors from the forefront organization. This information along with the analysis of the executive director's performance are the basis for determining the executive director's compensation.”
“Copies of the association's governing documents, conflict of interest policy and financial statements are available upon request at the association's offices for a nominal fee.”
“The oversight and selection process has not changed from the prior year.”
“One conservation easement was amended to strengthen the protection of conservation values and prevent the building that existed at the time of the gift from being expanded by a future owner of the property.”
“The association recognizes revenue and records an asset based on the approximate market value of the easement at the time of contribution. As of march 31, 2025, the association had title or conservation easements to land in lake forest, illinois amounting to $42,792,688 of which $26,372,438 was acquired through purchase, $10,199,091 was received by contributions and $6,221,159 was transferred from a related party. The $10,199,091 of donated property noted above has been stated at amounts which approximate the market value of such property at the dates the individual parcels were contributed to the association. 1) the association held thirty four easements consisting of approximately 302 acres at the end of the year. One easement wad added during the current year. All easements are located in the state of illinois and primarily in the city of lake forest. 2) no easements were sold, transferred, released or terminated during the year covered by this form 990 schedule d. 3)a. The association does not hold any easements that encumber a golf course or portions of a golf course. B. The association does not hold any easements that were acquired in a transaction described under purchase of real property from charitable organizations in notice 2004-41. 4) the association monitored all the acreage of its easements during the year covered by this form 990 schedule d through physical inspection and other means. 5) the total staff hours incurred for monitoring and enforcing new or existing easements during the year covered by this form 990 schedule d were 41 hours. The list of expenses incurred are as follows: easement monitoring $1,380 g&a costs $117,701 6) the association has one easement on a log cabin that was received in 1998. Therefore the association has not acquired an easement on buildings or structures after august 17, 2006.”
“The artistic collections consist of paintings, a sculpture and a stone ring. All artistic collections were donated. The artist collections are on display in the offices and on the grounds to provide inspiration and further our exempt purpose.”
“The endowment funds are to be used to further the mission of the organization.”
“The association is a not-for-profit entity as described in section 501(c)(3) of the internal revenue code and is exempt from federal income taxes on related income. It is also exempt from state income taxes for related income and qualifies for charitable contribution deductions in regard to its donors. The association would be subject to both federal and state taxes on unrelated business income, though it did not have any for the years ending march 31, 2025 and 2024. As of march 31, 2025 and 2024, the association did not have any uncertain tax positions that it is obligated to disclose. Additionally, there were no returns under review or open to review by taxing authorities in excess of statutory periods. The association follows a conservative approach of research and open disclosure in regard to its tax-exempt status and positions held.”
“Special events income shown gross on audited f/s, shown net on form 990 271,895.”
“Special events expenses shown gross on audited f/s, netted on form 990 271,895.”
This appendix keeps the raw XML leaves available for debugging and edge-case review. The human report above is the primary experience.
| Path | # | Value |
|---|---|---|
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| IRS990/AccountsPayableAccrExpnssGrp/BOYAmt | 0 | 111209 |
| IRS990/AccountsPayableAccrExpnssGrp/EOYAmt | 0 | 134379 |
| IRS990/AccountsReceivableGrp/BOYAmt | 0 | 37997 |
| IRS990/AccountsReceivableGrp/EOYAmt | 0 | 31671 |
| IRS990/ActivitiesConductedPrtshpInd | 0 | 0 |
| IRS990/ActivityOrMissionDesc | 0 | THE PRESERVATION AND MAINTENANCE OF OPEN LANDS, TO PROMOTE A CONNECTION BETWEEN THE COMMUNITY AND THE LAND WITHIN AND TO PROVIDE NATURALIST-LED ENVIRONMENTAL ENGAGEMENT TO SCHOOL CHILDREN AND SPECIAL WORKSHOPS TO CHILDREN, ADULTS AND FAMILIES. |
| IRS990/AllOtherContributionsAmt | 0 | 6496896 |
| IRS990/AllOtherExpensesGrp/FundraisingAmt | 0 | 17741 |
| IRS990/AllOtherExpensesGrp/ManagementAndGeneralAmt | 0 | 13117 |
| IRS990/AllOtherExpensesGrp/ProgramServicesAmt | 0 | 71801 |
| IRS990/AllOtherExpensesGrp/TotalAmt | 0 | 102659 |
| IRS990/AnnualDisclosureCoveredPrsnInd | 0 | 1 |
| IRS990/AuditCommitteeInd | 0 | 1 |
| IRS990/BackupWthldComplianceInd | 0 | 1 |
| IRS990/BooksInCareOfDetail/BusinessName/BusinessNameLine1Txt | 0 | JOHN HEMENWAY |
| IRS990/BooksInCareOfDetail/PhoneNum | 0 | 8472343880 |
| IRS990/BooksInCareOfDetail/USAddress/AddressLine1Txt | 0 | 350 NORTH WAUKEGAN ROAD |
| IRS990/BooksInCareOfDetail/USAddress/CityNm | 0 | LAKE FOREST |
| IRS990/BooksInCareOfDetail/USAddress/StateAbbreviationCd | 0 | IL |
| IRS990/BooksInCareOfDetail/USAddress/ZIPCd | 0 | 60045 |
| IRS990/BusinessRlnWith35CtrlEntInd | 0 | 0 |
| IRS990/BusinessRlnWithFamMemInd | 0 | 0 |
| IRS990/BusinessRlnWithOrgMemInd | 0 | 1 |
| IRS990/CashNonInterestBearingGrp/BOYAmt | 0 | 516365 |
| IRS990/CashNonInterestBearingGrp/EOYAmt | 0 | 532490 |
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| IRS990/CntrctRcvdGreaterThan100KCnt | 0 | 2 |
| IRS990/CollectionsOfArtInd | 0 | 1 |
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| IRS990/CompCurrentOfcrDirectorsGrp/ProgramServicesAmt | 0 | 69704 |
| IRS990/CompCurrentOfcrDirectorsGrp/TotalAmt | 0 | 104602 |
| IRS990/CompensationFromOtherSrcsInd | 0 | 0 |
| IRS990/CompensationProcessCEOInd | 0 | 1 |
| IRS990/CompensationProcessOtherInd | 0 | 0 |
| IRS990/ConflictOfInterestPolicyInd | 0 | 1 |
| IRS990/ConservationEasementsInd | 0 | 1 |
| IRS990/ConsolidatedAuditFinclStmtInd | 0 | 0 |
| IRS990/ContractorCompensationGrp/CompensationAmt | 0 | 254025 |
| IRS990/ContractorCompensationGrp/CompensationAmt | 1 | 107423 |
| IRS990/ContractorCompensationGrp/ContractorAddress/USAddress/AddressLine1Txt | 0 | 6575 WEST LOOP SOUTH SUITE 300 |
| IRS990/ContractorCompensationGrp/ContractorAddress/USAddress/AddressLine1Txt | 1 | 928 BARTLETT TERRACE |
| IRS990/ContractorCompensationGrp/ContractorAddress/USAddress/CityNm | 0 | BELLAIRE |
| IRS990/ContractorCompensationGrp/ContractorAddress/USAddress/CityNm | 1 | LIBERTYVILLE |
| IRS990/ContractorCompensationGrp/ContractorAddress/USAddress/StateAbbreviationCd | 0 | TX |
| IRS990/ContractorCompensationGrp/ContractorAddress/USAddress/StateAbbreviationCd | 1 | IL |
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| IRS990/ContractorCompensationGrp/ContractorAddress/USAddress/ZIPCd | 1 | 60048 |
| IRS990/ContractorCompensationGrp/ContractorName/BusinessName/BusinessNameLine1Txt | 0 | RES GREAT LAKES LLC |
| IRS990/ContractorCompensationGrp/ContractorName/BusinessName/BusinessNameLine1Txt | 1 | LIBERTY PRAIRIE RESTORATIONS |
| IRS990/ContractorCompensationGrp/ServicesDesc | 0 | LAND RESTORATION |
| IRS990/ContractorCompensationGrp/ServicesDesc | 1 | LAND MAINTENANCE |
| IRS990/ContriRptFundraisingEventAmt | 0 | 453043 |
| IRS990/CreditCounselingInd | 0 | 0 |
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| IRS990/CYContributionsGrantsAmt | 0 | 7265461 |
| IRS990/CYGrantsAndSimilarPaidAmt | 0 | 0 |
| IRS990/CYInvestmentIncomeAmt | 0 | 1612705 |
| IRS990/CYOtherExpensesAmt | 0 | 1523538 |
| IRS990/CYOtherRevenueAmt | 0 | -153796 |
| IRS990/CYProgramServiceRevenueAmt | 0 | 178395 |
| IRS990/CYRevenuesLessExpensesAmt | 0 | 6147897 |
| IRS990/CYSalariesCompEmpBnftPaidAmt | 0 | 1231330 |
| IRS990/CYTotalExpensesAmt | 0 | 2754868 |
| IRS990/CYTotalFundraisingExpenseAmt | 0 | 268961 |
| IRS990/CYTotalProfFndrsngExpnsAmt | 0 | 0 |
| IRS990/CYTotalRevenueAmt | 0 | 8902765 |
| IRS990/DecisionsSubjectToApprovaInd | 0 | 0 |
| IRS990/DeductibleArtContributionInd | 0 | 0 |
| IRS990/DeductibleNonCashContriInd | 0 | 1 |
| IRS990/DeferredRevenueGrp/BOYAmt | 0 | 77892 |
| IRS990/DeferredRevenueGrp/EOYAmt | 0 | 135080 |
| IRS990/DelegationOfMgmtDutiesInd | 0 | 0 |
| IRS990/DepreciationDepletionGrp/FundraisingAmt | 0 | 5567 |
| IRS990/DepreciationDepletionGrp/ManagementAndGeneralAmt | 0 | 5567 |
| IRS990/DepreciationDepletionGrp/ProgramServicesAmt | 0 | 211562 |
| IRS990/DepreciationDepletionGrp/TotalAmt | 0 | 222696 |
| IRS990/Desc | 0 | PRESERVATION AND MAINTENANCE OF OPEN LANDS FOR SCIENTIFIC AND ENGAGEMENT PURPOSES - PUBLIC HAS ACCESS TO THE LAND |
| IRS990/DescribedInSection501c3Ind | 0 | 1 |
| IRS990/DisregardedEntityInd | 0 | 0 |
| IRS990/DocumentRetentionPolicyInd | 0 | 1 |
| IRS990/DonorAdvisedFundInd | 0 | 0 |
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| IRS990/DonorRestrictionNetAssetsGrp/EOYAmt | 0 | 18944705 |
| IRS990/DonorRstrOrQuasiEndowmentsInd | 0 | 1 |
| IRS990/ElectionOfBoardMembersInd | 0 | 0 |
| IRS990/EmployeeCnt | 0 | 27 |
| IRS990/EmploymentTaxReturnsFiledInd | 0 | 1 |
| IRS990/EngagedInExcessBenefitTransInd | 0 | 0 |
| IRS990/EscrowAccountInd | 0 | 0 |
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| IRS990/FeesForServicesAccountingGrp/TotalAmt | 0 | 36338 |
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| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 17 | 40.00 |
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| IRS990/Form990PartVIISectionAGrp/IndividualTrusteeOrDirectorInd | 5 | X |
| IRS990/Form990PartVIISectionAGrp/IndividualTrusteeOrDirectorInd | 6 | X |
| IRS990/Form990PartVIISectionAGrp/IndividualTrusteeOrDirectorInd | 7 | X |
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| IRS990/Form990PartVIISectionAGrp/IndividualTrusteeOrDirectorInd | 9 | X |
| IRS990/Form990PartVIISectionAGrp/IndividualTrusteeOrDirectorInd | 10 | X |
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| IRS990/Form990PartVIISectionAGrp/IndividualTrusteeOrDirectorInd | 12 | X |
| IRS990/Form990PartVIISectionAGrp/IndividualTrusteeOrDirectorInd | 13 | X |
| IRS990/Form990PartVIISectionAGrp/IndividualTrusteeOrDirectorInd | 14 | X |
| IRS990/Form990PartVIISectionAGrp/IndividualTrusteeOrDirectorInd | 15 | X |
| IRS990/Form990PartVIISectionAGrp/OfficerInd | 0 | X |
| IRS990/Form990PartVIISectionAGrp/OfficerInd | 1 | X |
| IRS990/Form990PartVIISectionAGrp/OfficerInd | 2 | X |
| IRS990/Form990PartVIISectionAGrp/OfficerInd | 3 | X |
| IRS990/Form990PartVIISectionAGrp/OfficerInd | 4 | X |
| IRS990/Form990PartVIISectionAGrp/OfficerInd | 5 | X |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 0 | 0 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 1 | 755 |
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| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 16 | 0 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 17 | 0 |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 0 | MARK T AHERN |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 1 | RYAN G LONDON |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 2 | GEORGE M COVINGTON |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 3 | STEVEN H BAER |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 4 | BRETT L PASCHKE |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 5 | MATTHEW CLAEYS |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 6 | LOIS MORRISON |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 7 | JAMES F DEAN |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 8 | MELISSA GOLTRA |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 9 | MARGARET JESSEN KELLEY |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 10 | KIM MADDEN |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 11 | PAULA L PRESCHLACK |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 12 | MATT SUNDERMAN |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 13 | MIAH ARMOUR |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 14 | AMY ROGERS |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 15 | MARION SEARLE |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 16 | PAULA CLAIR-GOULD |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 17 | JOHN HEMENWAY |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 0 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 1 | 160925 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 2 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 3 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 4 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 5 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 6 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 7 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 8 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 9 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 10 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 11 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 12 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 13 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 14 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 15 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 16 | 126079 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 17 | 102097 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromRltdOrgAmt | 0 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromRltdOrgAmt | 1 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromRltdOrgAmt | 2 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromRltdOrgAmt | 3 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromRltdOrgAmt | 4 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromRltdOrgAmt | 5 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromRltdOrgAmt | 6 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromRltdOrgAmt | 7 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromRltdOrgAmt | 8 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromRltdOrgAmt | 9 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromRltdOrgAmt | 10 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromRltdOrgAmt | 11 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromRltdOrgAmt | 12 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromRltdOrgAmt | 13 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromRltdOrgAmt | 14 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromRltdOrgAmt | 15 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromRltdOrgAmt | 16 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromRltdOrgAmt | 17 | 0 |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 0 | DIRECTOR |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 1 | PRESIDENT |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 2 | SECRETARY |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 3 | VICE PRESIDENT & TREASURER |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 4 | CHAIRMAN |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 5 | DIRECTOR |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 6 | DIRECTOR |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 7 | VICE-CHAIR |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 8 | VICE-CHAIR |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 9 | DIRECTOR |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 10 | DIRECTOR |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 11 | DIRECTOR |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 12 | DIRECTOR |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 13 | DIRECTOR |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 14 | DIRECTOR |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 15 | DIRECTOR |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 16 | VICE PRESIDENT - DEVELOPME |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 17 | CONTROLLER |
| IRS990/Form990ProvidedToGvrnBodyInd | 0 | 1 |
| IRS990/FormationYr | 0 | 1967 |
| IRS990/FormerOfcrEmployeesListedInd | 0 | 0 |
| IRS990/FSAuditedBasisGrp/SeparateBasisFinclStmtInd | 0 | X |
| IRS990/FSAuditedInd | 0 | 1 |
| IRS990/FundraisingActivitiesInd | 0 | 1 |
| IRS990/FundraisingAmt | 0 | 453043 |
| IRS990/FundraisingDirectExpensesAmt | 0 | 271895 |
| IRS990/FundraisingGrossIncomeAmt | 0 | 117199 |
| IRS990/GainOrLossGrp/OtherAmt | 0 | 500 |
| IRS990/GainOrLossGrp/SecuritiesAmt | 0 | 969638 |
| IRS990/GamingActivitiesInd | 0 | 0 |
| IRS990/GoverningBodyVotingMembersCnt | 0 | 16 |
| IRS990/GrantsToIndividualsInd | 0 | 0 |
| IRS990/GrantsToOrganizationsInd | 0 | 0 |
| IRS990/GrantToRelatedPersonInd | 0 | 0 |
| IRS990/GrossAmountSalesAssetsGrp/OtherAmt | 0 | 500 |
| IRS990/GrossAmountSalesAssetsGrp/SecuritiesAmt | 0 | 8311096 |
| IRS990/GrossReceiptsAmt | 0 | 16516118 |
| IRS990/GrossRentsGrp/RealAmt | 0 | 900 |
| IRS990/GroupReturnForAffiliatesInd | 0 | 0 |
| IRS990/IncludeFIN48FootnoteInd | 0 | 1 |
| IRS990/IndependentAuditFinclStmtInd | 0 | 1 |
| IRS990/IndependentVotingMemberCnt | 0 | 15 |
| IRS990/IndivRcvdGreaterThan100KCnt | 0 | 3 |
| IRS990/IndoorTanningServicesInd | 0 | 0 |
| IRS990/InfoInScheduleOPartIIIInd | 0 | X |
| IRS990/InfoInScheduleOPartVIInd | 0 | X |
| IRS990/InfoInScheduleOPartXIIInd | 0 | X |
| IRS990/InsuranceGrp/FundraisingAmt | 0 | 852 |
| IRS990/InsuranceGrp/ManagementAndGeneralAmt | 0 | 12776 |
| IRS990/InsuranceGrp/ProgramServicesAmt | 0 | 63029 |
| IRS990/InsuranceGrp/TotalAmt | 0 | 76657 |
| IRS990/InterestGrp/ProgramServicesAmt | 0 | 284781 |
| IRS990/InterestGrp/TotalAmt | 0 | 284781 |
| IRS990/InvestmentIncomeGrp/ExclusionAmt | 0 | 642567 |
| IRS990/InvestmentIncomeGrp/TotalRevenueColumnAmt | 0 | 642567 |
| IRS990/InvestmentInJointVentureInd | 0 | 0 |
| IRS990/InvestmentsOtherSecuritiesGrp/BOYAmt | 0 | 21545884 |
| IRS990/InvestmentsOtherSecuritiesGrp/EOYAmt | 0 | 22304169 |
| IRS990/InvestTaxExemptBondsInd | 0 | 0 |
| IRS990/IRPDocumentCnt | 0 | 2 |
| IRS990/IRPDocumentW2GCnt | 0 | 0 |
| IRS990/LandBldgEquipAccumDeprecAmt | 0 | 3261229 |
| IRS990/LandBldgEquipBasisNetGrp/BOYAmt | 0 | 43499962 |
| IRS990/LandBldgEquipBasisNetGrp/EOYAmt | 0 | 50955540 |
| IRS990/LandBldgEquipCostOrOtherBssAmt | 0 | 54216769 |
| IRS990/LegalDomicileStateCd | 0 | IL |
| IRS990/LessCostOthBasisSalesExpnssGrp/OtherAmt | 0 | 0 |
| IRS990/LessCostOthBasisSalesExpnssGrp/SecuritiesAmt | 0 | 7341458 |
| IRS990/LessRentalExpensesGrp/RealAmt | 0 | 0 |
| IRS990/LoanOutstandingInd | 0 | 0 |
| IRS990/LobbyingActivitiesInd | 0 | 1 |
| IRS990/LocalChaptersInd | 0 | 0 |
| IRS990/MaterialDiversionOrMisuseInd | 0 | 0 |
| IRS990/MembershipDuesAmt | 0 | 315522 |
| IRS990/MembersOrStockholdersInd | 0 | 0 |
| IRS990/MethodOfAccountingAccrualInd | 0 | X |
| IRS990/MinutesOfCommitteesInd | 0 | 1 |
| IRS990/MinutesOfGoverningBodyInd | 0 | 1 |
| IRS990/MissionDesc | 0 | SINCE ITS ESTABLISHMENT IN 1967, THE ASSOCIATION HAS ACQUIRED, PRESERVED AND MAINTAINED OVER 930 ACRES OF LOCAL NATIVE LANDSCAPES INCLUDING PRAIRIES, SAVANNAS, RAVINES, WOODLANDS AND WETLANDS FOR THE BENEFIT AND ENJOYMENT OF THE ENTIRE COMMUNITY. WE CONTINUE OUR EFFORTS TO RESTORE THE LAND TO ITS HISTORICAL LANDSCAPE AND MAINTAIN THESE CRITICAL HABITATS. IN ADDITION, TO PROMOTE A CONNECTION BETWEEN THE COMMUNITY AND THE LAND WITHIN IT, OUR PRESERVES ARE HOME TO OVER 20 MILES OF WALKING TRAILS WHICH ARE OPEN TO THE PUBLIC YEAR ROUND.THE ASSOCIATION ALSO PROVIDES NATURALIST-LED ENVIRONMENTAL ENGAGEMENTS TO SCHOOL CHILDREN & SPECIAL WORKSHOPS OFFERED TO CHILDREN, ADULTS & FAMILIES. OUR ENVIRONMENTAL ENGAGEMENT PROGRAMS ARE DESIGNED TO DEVELOP AN UNDERSTANDING OF AND A LOVE AND RESPECT FOR THE NATURAL WORLD AROUND US BY INCLUDING HANDS-ON, PARTICIPATORY ACTIVITIES IN A NATURAL SETTING. ASSOCIATION ALSO COOPERATES WITH SEVERAL INSTITUTIONS PROMOTE THE SCIENTIFIC STUDY OF OUR PRESERVES. |
| IRS990/MoreThan5000KToIndividualsInd | 0 | 0 |
| IRS990/MoreThan5000KToOrgInd | 0 | 0 |
| IRS990/NetAssetsOrFundBalancesBOYAmt | 0 | 66132396 |
| IRS990/NetAssetsOrFundBalancesEOYAmt | 0 | 72099257 |
| IRS990/NetGainOrLossInvestmentsGrp/ExclusionAmt | 0 | 970138 |
| IRS990/NetGainOrLossInvestmentsGrp/TotalRevenueColumnAmt | 0 | 970138 |
| IRS990/NetIncmFromFundraisingEvtGrp/ExclusionAmt | 0 | -154696 |
| IRS990/NetIncmFromFundraisingEvtGrp/TotalRevenueColumnAmt | 0 | -154696 |
| IRS990/NetRentalIncomeOrLossGrp/ExclusionAmt | 0 | 900 |
| IRS990/NetRentalIncomeOrLossGrp/TotalRevenueColumnAmt | 0 | 900 |
| IRS990/NetUnrelatedBusTxblIncmAmt | 0 | 0 |
| IRS990/NetUnrlzdGainsLossesInvstAmt | 0 | -181036 |
| IRS990/NoDonorRestrictionNetAssetsGrp/BOYAmt | 0 | 46901379 |
| IRS990/NoDonorRestrictionNetAssetsGrp/EOYAmt | 0 | 53154552 |
| IRS990/NoncashContributionsAmt | 0 | 226200 |
| IRS990/NondeductibleContributionsInd | 0 | 0 |
| IRS990/OccupancyGrp/ProgramServicesAmt | 0 | 6600 |
| IRS990/OccupancyGrp/TotalAmt | 0 | 6600 |
| IRS990/OfficerMailingAddressInd | 0 | 0 |
| IRS990/OnBehalfOfIssuerInd | 0 | 0 |
| IRS990/OperateHospitalInd | 0 | 0 |
| IRS990/Organization501c3Ind | 0 | X |
| IRS990/OrganizationFollowsFASB117Ind | 0 | X |
| IRS990/OtherAssetsTotalGrp/BOYAmt | 0 | 791695 |
| IRS990/OtherAssetsTotalGrp/EOYAmt | 0 | 786574 |
| IRS990/OtherChangesInNetAssetsAmt | 0 | 0 |
| IRS990/OtherEmployeeBenefitsGrp/FundraisingAmt | 0 | 16837 |
| IRS990/OtherEmployeeBenefitsGrp/ManagementAndGeneralAmt | 0 | 7593 |
| IRS990/OtherEmployeeBenefitsGrp/ProgramServicesAmt | 0 | 74120 |
| IRS990/OtherEmployeeBenefitsGrp/TotalAmt | 0 | 98550 |
| IRS990/OtherExpensesGrp/Desc | 0 | LAND MAINTENANCE |
| IRS990/OtherExpensesGrp/Desc | 1 | MISCELLANEOUS |
| IRS990/OtherExpensesGrp/Desc | 2 | NEWSLETTER & ANNUAL REP |
| IRS990/OtherExpensesGrp/Desc | 3 | EDUCATION PROGRAMS |
| IRS990/OtherExpensesGrp/FundraisingAmt | 0 | 22004 |
| IRS990/OtherExpensesGrp/FundraisingAmt | 1 | 10522 |
| IRS990/OtherExpensesGrp/ManagementAndGeneralAmt | 0 | 22005 |
| IRS990/OtherExpensesGrp/ProgramServicesAmt | 0 | 477439 |
| IRS990/OtherExpensesGrp/ProgramServicesAmt | 1 | 88017 |
| IRS990/OtherExpensesGrp/ProgramServicesAmt | 2 | 77043 |
| IRS990/OtherExpensesGrp/ProgramServicesAmt | 3 | 86012 |
| IRS990/OtherExpensesGrp/TotalAmt | 0 | 477439 |
| IRS990/OtherExpensesGrp/TotalAmt | 1 | 132026 |
| IRS990/OtherExpensesGrp/TotalAmt | 2 | 87565 |
| IRS990/OtherExpensesGrp/TotalAmt | 3 | 86012 |
| IRS990/OtherLiabilitiesGrp/BOYAmt | 0 | 45195 |
| IRS990/OtherLiabilitiesGrp/EOYAmt | 0 | 40074 |
| IRS990/OtherSalariesAndWagesGrp/FundraisingAmt | 0 | 145078 |
| IRS990/OtherSalariesAndWagesGrp/ManagementAndGeneralAmt | 0 | 81160 |
| IRS990/OtherSalariesAndWagesGrp/ProgramServicesAmt | 0 | 722580 |
| IRS990/OtherSalariesAndWagesGrp/TotalAmt | 0 | 948818 |
| IRS990/OthNotesLoansReceivableNetGrp/BOYAmt | 0 | 460864 |
| IRS990/PartialLiquidationInd | 0 | 0 |
| IRS990/PayPremiumsPrsnlBnftCntrctInd | 0 | 0 |
| IRS990/PayrollTaxesGrp/FundraisingAmt | 0 | 13559 |
| IRS990/PayrollTaxesGrp/ManagementAndGeneralAmt | 0 | 6114 |
| IRS990/PayrollTaxesGrp/ProgramServicesAmt | 0 | 59687 |
| IRS990/PayrollTaxesGrp/TotalAmt | 0 | 79360 |
| IRS990/PledgesAndGrantsReceivableGrp/BOYAmt | 0 | 1024047 |
| IRS990/PledgesAndGrantsReceivableGrp/EOYAmt | 0 | 1291379 |
| IRS990/PoliticalCampaignActyInd | 0 | 0 |
| IRS990/PrepaidExpensesDefrdChargesGrp/BOYAmt | 0 | 89723 |
| IRS990/PrepaidExpensesDefrdChargesGrp/EOYAmt | 0 | 81566 |
| IRS990/PrincipalOfficerNm | 0 | RYAN LONDON |
| IRS990/ProfessionalFundraisingInd | 0 | 0 |
| IRS990/ProgramServiceRevenueGrp/BusinessCd | 0 | 900099 |
| IRS990/ProgramServiceRevenueGrp/BusinessCd | 1 | 900099 |
| IRS990/ProgramServiceRevenueGrp/Desc | 0 | ASSESSMENT REVENUE |
| IRS990/ProgramServiceRevenueGrp/Desc | 1 | ENGAGEMENT PROGRAM FEE |
| IRS990/ProgramServiceRevenueGrp/ExclusionAmt | 0 | 124928 |
| IRS990/ProgramServiceRevenueGrp/RelatedOrExemptFuncIncomeAmt | 0 | 53467 |
| IRS990/ProgramServiceRevenueGrp/TotalRevenueColumnAmt | 0 | 124928 |
| IRS990/ProgramServiceRevenueGrp/TotalRevenueColumnAmt | 1 | 53467 |
| IRS990/ProgSrvcAccomActy2Grp/Desc | 0 | PROVIDE NATURALIST - LED ENVIRONMENTAL ENGAGEMENTS TO SCHOOL CHILDREN AND SPECIAL WORKSHOPS FOR CHILDREN, ADULTS AND FAMILIES. |
| IRS990/ProgSrvcAccomActy2Grp/ExpenseAmt | 0 | 922347 |
| IRS990/ProgSrvcAccomActy2Grp/RevenueAmt | 0 | 53467 |
| IRS990/ProhibitedTaxShelterTransInd | 0 | 0 |
| IRS990/PYBenefitsPaidToMembersAmt | 0 | 0 |
| IRS990/PYContributionsGrantsAmt | 0 | 3297607 |
| IRS990/PYExcessBenefitTransInd | 0 | 0 |
| IRS990/PYGrantsAndSimilarPaidAmt | 0 | 0 |
| IRS990/PYInvestmentIncomeAmt | 0 | 860064 |
| IRS990/PYOtherExpensesAmt | 0 | 1378792 |
| IRS990/PYOtherRevenueAmt | 0 | -158150 |
| IRS990/PYProgramServiceRevenueAmt | 0 | 191980 |
| IRS990/PYRevenuesLessExpensesAmt | 0 | 1675316 |
| IRS990/PYSalariesCompEmpBnftPaidAmt | 0 | 1137393 |
| IRS990/PYTotalExpensesAmt | 0 | 2516185 |
| IRS990/PYTotalProfFndrsngExpnsAmt | 0 | 0 |
| IRS990/PYTotalRevenueAmt | 0 | 4191501 |
| IRS990/QuidProQuoContributionsInd | 0 | 1 |
| IRS990/QuidProQuoContriDisclInd | 0 | 1 |
| IRS990/RcvFndsToPayPrsnlBnftCntrctInd | 0 | 0 |
| IRS990/ReconcilationRevenueExpnssAmt | 0 | 6147897 |
| IRS990/RegularMonitoringEnfrcInd | 0 | 1 |
| IRS990/RelatedEntityInd | 0 | 1 |
| IRS990/RelatedOrganizationCtrlEntInd | 0 | 0 |
| IRS990/RentalIncomeOrLossGrp/RealAmt | 0 | 900 |
| IRS990/ReportInvestmentsOtherSecInd | 0 | 1 |
| IRS990/ReportLandBuildingEquipmentInd | 0 | 1 |
| IRS990/ReportOtherAssetsInd | 0 | 0 |
| IRS990/ReportOtherLiabilitiesInd | 0 | 1 |
| IRS990/ReportProgramRelatedInvstInd | 0 | 0 |
| IRS990/SavingsAndTempCashInvstGrp/BOYAmt | 0 | 8346845 |
| IRS990/SavingsAndTempCashInvstGrp/EOYAmt | 0 | 6377803 |
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