Liabilities / Assets
8th percentile
Higher debt load relative to assets than 8% of similar nonprofits.
EIN 13-3523329 • 501(c)3 • Bedford, NY
Profile
To preserve, protect and promote appreciation of the natural heritage of the mianus river watershed through land acquisition and conservation, scientific research & public education.
Precomputed percentiles relative to similar nonprofits. These scores are descriptive rather than judgmental.
Liabilities / Assets
8th percentile
Higher debt load relative to assets than 8% of similar nonprofits.
Liabilities / Revenue
14th percentile
Higher debt load relative to revenue than 14% of similar nonprofits.
Net Margin
80th percentile
Higher net margin than 80% of similar nonprofits.
Top Officer Pay
Score unavailable
No filing with officer rows is available for this organization yet.
Asset Growth
41st percentile
Faster asset growth than 41% of similar nonprofits.
Revenue Growth
8th percentile
Faster revenue growth than 8% of similar nonprofits.
Assets
Up$27,050,438
Up $783,893 (+3.0%) from 2023
Liabilities
Down$67,318
Down $13,754 (-17%) from 2023
Net Assets
Up$26,983,120
Up $797,647 (+3.0%) from 2023
Revenue
Down$1,457,308
Down $597,763 (-29%) from 2023
Expenses
Up$1,054,272
Up $100,794 (+11%) from 2023
Net Income
Down$403,036
Down $698,557 (-63%) from 2023
Most recent year
2024 • Form 990Detailed filing. Detailed filing data is available for this year.
The mission of mianus river gorge, an independent, not-for-profit organization is to preserve, protect and promote appreciation of the natural heritage of the mianus river watershed through land acquisition and conservation, scientific research & public education.
Mianus river gorge, inc.'s mission is to preserve, protect, and promote appreciation of the natural heritage of the mianus river watershed through land acquisition and conservation, scientific research and public education throughout the region.
| Line | Beginning | End | Change |
|---|---|---|---|
| Assets | |||
| Land, Buildings, and Equipment, Net | $22,121,557 | $22,474,850 | ▲ $353,293 |
| Investments in Publicly Traded Securities | $3,830,559 | $4,148,555 | ▲ $317,996 |
| Savings and Temporary Cash Investments | $227,615 | $196,025 | ▼ $31,590 |
| Pledges and Grants Receivable | $20,593 | $134,604 | ▲ $114,011 |
| Cash and Non-Interest-Bearing Accounts | $47,005 | $76,688 | ▲ $29,683 |
| Prepaid Expenses and Deferred Charges | $12,310 | $15,110 | ▲ $2,800 |
| Inventories for Sale or Use | $6,906 | $4,606 | ▼ $2,300 |
| Total Assets | $26,266,545 | $27,050,438 | ▲ $783,893 |
| Liabilities | |||
| Accounts Payable and Accrued Expenses | $81,072 | $67,318 | ▼ $13,754 |
| Total Liabilities | $81,072 | $67,318 | ▼ $13,754 |
| Net Assets / Fund Balance | |||
| Net Assets Without Donor Restrictions | $26,079,679 | $26,798,054 | ▲ $718,375 |
| Net Assets With Donor Restrictions | $105,794 | $185,066 | ▲ $79,272 |
| Total Net Assets Fund Balance | $26,185,473 | $26,983,120 | ▲ $797,647 |
| Total Liabilities and Net Assets / Fund Balance | $26,266,545 | $27,050,438 | ▲ $783,893 |
| Asset | Book Value | Depreciation | Basis |
|---|---|---|---|
| Land | $22,158,901 | - | $22,158,901 |
| Leasehold Improvements | $216,647 | $153,298 | $369,945 |
| Equipment | $99,302 | $129,213 | $228,515 |
| Period | Beginning | Contrib. | Gain/Loss | Other Uses | End |
|---|---|---|---|---|---|
| 2024 | $3,765,149 | - | ▲ $468,312 | $15,000 | $4,218,461 |
| 2023 | $3,524,668 | - | ▲ $273,262 | $32,781 | $3,765,149 |
| 2022 | $4,333,251 | - | ▼ $733,806 | $74,777 | $3,524,668 |
| 2021 | $4,952,007 | - | ▲ $600,917 | $1,219,673 | $4,333,251 |
| 2020 | $4,410,359 | - | ▲ $666,355 | $124,707 | $4,952,007 |
| Name | Title | Full / Part Time | Base | Other | Total |
|---|---|---|---|---|---|
| Roderick Christie | Executive Di | FT | $136,432 | $75,468 | $211,900 |
| Roderick Christie | Executive Director | - | $130,432 | $81,468 | $211,900 |
| Leslie Zachary | Dev Director | FT | $105,750 | $14,988 | $120,738 |
| Name | Title |
|---|---|
| Timothy W Evnin | Chairman |
| Andre a Hunter | President |
| Christopher Du P Roosevelt | Vice Chairma |
| Alexandra Kotur | Trustee |
| Ashley W Schulten | Trustee |
| Brian Choi | Trustee |
| Daniel T Ryan | Trustee |
| Gerardo Mendez | Trustee |
| Happy Menocal | Trustee |
| Heather V Wolf | Trustee |
| Jayni Chase | Trustee |
| John S Needham | Trustee |
| Lloyd Gerry | Trustee |
| Martin Torres | Trustee |
| Nicholas Firth | Trustee |
| Nicki Dugan Pogue | Trustee |
| Robert Morse | Trustee |
| William G Foulke Jr | Trustee |
| Sarah Schwarzschild | Secretary |
| Katheryn Hoenig | Treasurer |
| Contribution Type | Contribution Count | Reported Amount | Valuation Method |
|---|---|---|---|
| Real Estate Other | 1 | $275,000 | Land-appraisal Value |
| Securities Publicly Traded | 10 | $81,128 | Fair Market Value |
| Total Noncash Contributions | 11 | $356,128 | - |
| Line Item | Amount |
|---|---|
| Salaries, Compensation, and Employee Benefits | $718,940 |
| Other Expenses | $335,332 |
| Total Fundraising Expense | $187,278 |
| Grants and Similar Amounts Paid | $0 |
| Professional Fundraising Fees | $0 |
| Line Item | Program | Management | Fundraising | Total |
|---|---|---|---|---|
| Other Salaries and Wages | $270,524 | $40,632 | $107,701 | $418,857 |
| Current Officers, Directors, Trustees, and Key Employees | $107,781 | $15,008 | $13,643 | $136,432 |
| Occupancy | $121,608 | $7,487 | $1,431 | $130,526 |
| Pension Plan Contributions | $51,752 | $7,294 | $8,273 | $67,319 |
| Office Expenses | $38,031 | $5,779 | $18,759 | $62,569 |
| Other Employee Benefits | $42,236 | $3,058 | $9,366 | $54,660 |
| Payroll Taxes | $28,337 | $4,167 | $9,168 | $41,672 |
| Insurance | $29,794 | $3,795 | $1,898 | $35,487 |
| Depreciation Depletion | $24,406 | $3,051 | $3,051 | $30,508 |
| Other Expenses | $22,929 | - | $13,988 | $22,929 |
| Fees for Services Accounting | - | $21,041 | - | $21,041 |
| Fees for Services Legal | $1,368 | - | - | $1,368 |
| Fees for Services Other | $8 | $32 | - | $40 |
| Total Functional Expenses | $755,650 | $111,344 | $187,278 | $1,054,272 |
| Line Item | Amount |
|---|---|
| Total Expenses per Audited Statements | $1,079,660 |
| Expenses per Audited Statements | $1,054,272 |
| Total Expenses per Form 990 | $1,054,272 |
| Expenses Not Reported on Form 990 | $25,388 |
| Line Item | Amount |
|---|---|
| Fundraising Direct Expenses | $23,388 |
| Fundraising Gross Income | $19,570 |
| Professional Fundraising Fees | $0 |
| Event | Gross Receipts | Gross Revenue | Direct Expenses | Net Income |
|---|---|---|---|---|
| Caramoor | $40,082 | - | - | - |
| Wingding | $106,949 | $19,570 | - | $19,570 |
| Total Events | $147,031 | $19,570 | $23,388 | $-3,818 |
“Form 990 is prepared by an outside accounting firm. It is reviewed by management and the audit committee. Any questions or recommendations are addressed by the accountant and executive director. The final 990 is then reviewed by the treasurer and chairman. A completed copy is distributed electronically to the board before filing.”
“The organization has a conflict of interest policy in place which it annually monitors and enforces. All members of management and the governing body annually sign a conflict of interest policy and disclose any potential or actual conflicts that may exist. If an actual conflict exists, that member does not participate in the consideration nor vote on the matter and may be required to leave that portion of the meeting during the discussion. The minutes will disclose such matters.”
“The board determines compensation by reviewing appropriate and adequate data to determine the reasonableness of the compensation being considered. A performance evaluation is conducted annually and the compensation is adjusted periodically. The approval of the compensation is documented in the meeting minutes.”
“The organization makes its 990 available for public inspections on guidestar.org. Form 990 and financial statements are also available on charitiesnys.com and the organizations website. In addition, the policies of the organization, form 1023, bylaws, financial statements and form 990 are available upon request.”
“Mianus river gorge, inc.'s mission is to preserve, protect, and promote appreciation of the natural heritage of the mianus river watershed through land acquisition and conservation, scientific research and public education throughout the region.”
“Land protection: in 2024 mrg continued to work on land projects that we hope will lead to more protected land in the future. Mrg also continued habitat restoration work on many of the lands acquired in previous years including invasive species removal, replanting of native species, and protection of rare plant communities. Research & education: research assistantship program (rap) offers funding for graduate-level research in the fields of ecology and conservation. Each rap recipient receives a yearly stipend of 5000 for three years toward a specific project addressing an ecological question that affects mrg. Rap recipients also mentor high school students in our wtp program. In 2024, mrg hosted the rap student from cornell university, who is in the second year of his study, and also co-authored three scholarly papers. College intern program in suburban ecology (cise) offers internships to undergraduate students to study a variety of issues facing suburban preserves. Students work with staff and rap and wtp students. Mrg hosted four undergraduate interns in 2024. Our wildlife technician program (wtp) offers high school students from the region the opportunity to conduct a 2.5-year (from 10th grade to 12th grade) research study under the mentorship of our staff and rap students. The program was designed to complement the state university of new york science research in the high school (srhs) curriculum and provides access to scientific mentors, hands-on field experience, and immersion into real- world conservation problems facing suburban ecosystems. In 2024, mrg mentored 12 wtp students across 10th to 12th grade. Public programs & outreach: in 2024, mrg staff presented numerous public programs across the region about co-existing with bears, consulted with community members about invasive species biology and management, and lead general education programs / nature walks for approx. 100 people. Specific topics included vernal pools in spring landscapes; the old-growth forest; birding; owl biology; and winter tree id. Stewardship: we worked on stewarding the trail system by designing an easy loop trail and restoring the iconic havemeyer falls trail in 2024. Mrg successfully completed a forest restoration project that included removing invasive species and erecting deer exclosures to protect the forest floor from hungry deer. Mianus river gorge systematically follows a land management plan that divides protected land into management units, each with a specific strategy based on phenology and habitat type.”
“Direct fundraising costs 23,388 direct fundraising costs -23,388”
“The organization has a written management plan for conservation easement management. All easements are annually monitored whereby the director of land management coordinates a site visit with the property owner, if they so desire to participate, a brief report is written and sometimes photos are taken if there have been changes to the property and/or any violations have occured.”
“Conservation easements are not reflected in the financial statements as either assets or liabilities. The acquisition costs or other costs associated with the conservation easements are expensed as incurred.”
“The organization maintains various board-designated funds to provide long- term support for its mission. Funds are designated for future land purchases, to cover the costs of enforcing its easements, to cover costs of stewarding land and easements and funds for future periods or specific purposes.”
“The organization has determined that there are no material uncertain tax positions that require recognition or disclosure in the financial statements.”
“Direct fundraising costs 23,388”
“Direct fundraising costs 23,388”
This appendix keeps the raw XML leaves available for debugging and edge-case review. The human report above is the primary experience.
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| IRS990/ActivityOrMissionDesc | 0 | MIANUS RIVER GORGE, INC.'S MISSION IS TO PRESERVE, PROTECT, AND PROMOTE APPRECIATION OF THE NATURAL HERITAGE OF THE MIANUS RIVER WATERSHED THROUGH LAND ACQUISITION AND CONSERVATION, SCIENTIFIC RESEARCH AND PUBLIC EDUCATION THROUGHOUT THE REGION. |
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| IRS990/Desc | 0 | LAND PROTECTION: IN 2024 MRG CONTINUED TO WORK ON LAND PROJECTS THAT WE HOPE WILL LEAD TO MORE PROTECTED LAND IN THE FUTURE. MRG ALSO CONTINUED HABITAT RESTORATION WORK ON MANY OF THE LANDS ACQUIRED IN PREVIOUS YEARS INCLUDING INVASIVE SPECIES REMOVAL, REPLANTING OF NATIVE SPECIES, AND PROTECTION OF RARE PLANT COMMUNITIES. RESEARCH & EDUCATION: RESEARCH ASSISTANTSHIP PROGRAM (RAP) OFFERS FUNDING FOR GRADUATE-LEVEL RESEARCH IN THE FIELDS OF ECOLOGY AND CONSERVATION. EACH RAP RECIPIENT RECEIVES A YEARLY STIPEND OF 5000 FOR THREE YEARS TOWARD A SPECIFIC PROJECT ADDRESSING AN ECOLOGICAL QUESTION THAT AFFECTS MRG. RAP RECIPIENTS ALSO MENTOR HIGH SCHOOL STUDENTS IN OUR WTP PROGRAM. IN 2024, MRG HOSTED THE RAP STUDENT FROM CORNELL UNIVERSITY, WHO IS IN THE SECOND YEAR OF HIS STUDY, AND ALSO CO-AUTHORED THREE SCHOLARLY PAPERS. COLLEGE INTERN PROGRAM IN SUBURBAN ECOLOGY (CISE) OFFERS INTERNSHIPS TO UNDERGRADUATE STUDENTS TO STUDY A VARIETY OF ISSUES FACING SUBURBAN PRESERVES. STUDENTS WORK WITH STAFF AND RAP AND WTP STUDENTS. MRG HOSTED FOUR UNDERGRADUATE INTERNS IN 2024. OUR WILDLIFE TECHNICIAN PROGRAM (WTP) OFFERS HIGH SCHOOL STUDENTS FROM THE REGION THE OPPORTUNITY TO CONDUCT A 2.5-YEAR (FROM 10TH GRADE TO 12TH GRADE) RESEARCH STUDY UNDER THE MENTORSHIP OF OUR STAFF AND RAP STUDENTS. THE PROGRAM WAS DESIGNED TO COMPLEMENT THE STATE UNIVERSITY OF NEW YORK SCIENCE RESEARCH IN THE HIGH SCHOOL (SRHS) CURRICULUM AND PROVIDES ACCESS TO SCIENTIFIC MENTORS, HANDS-ON FIELD EXPERIENCE, AND IMMERSION INTO REAL- WORLD CONSERVATION PROBLEMS FACING SUBURBAN ECOSYSTEMS. IN 2024, MRG MENTORED 12 WTP STUDENTS ACROSS 10TH TO 12TH GRADE. PUBLIC PROGRAMS & OUTREACH: IN 2024, MRG STAFF PRESENTED NUMEROUS PUBLIC PROGRAMS ACROSS THE REGION ABOUT CO-EXISTING WITH BEARS, CONSULTED WITH COMMUNITY MEMBERS ABOUT INVASIVE SPECIES BIOLOGY AND MANAGEMENT, AND LEAD GENERAL EDUCATION PROGRAMS / NATURE WALKS FOR APPROX. 100 PEOPLE. SPECIFIC TOPICS INCLUDED VERNAL POOLS IN SPRING LANDSCAPES; THE OLD-GROWTH FOREST; BIRDING; OWL BIOLOGY; AND WINTER TREE ID. STEWARDSHIP: WE WORKED ON STEWARDING THE TRAIL SYSTEM BY DESIGNING AN EASY LOOP TRAIL AND RESTORING THE ICONIC HAVEMEYER FALLS TRAIL IN 2024. MRG SUCCESSFULLY COMPLETED A FOREST RESTORATION PROJECT THAT INCLUDED REMOVING INVASIVE SPECIES AND ERECTING DEER EXCLOSURES TO PROTECT THE FOREST FLOOR FROM HUNGRY DEER. MIANUS RIVER GORGE SYSTEMATICALLY FOLLOWS A LAND MANAGEMENT PLAN THAT DIVIDES PROTECTED LAND INTO MANAGEMENT UNITS, EACH WITH A SPECIFIC STRATEGY BASED ON PHENOLOGY AND HABITAT TYPE. |
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| IRS990/Form990PartVIISectionAGrp/PersonNm | 3 | CHRISTOPHER DU P ROOSEVELT |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 4 | ANDRE A HUNTER |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 5 | KATHERYN HOENIG |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 6 | SARAH SCHWARZSCHILD |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 7 | JAYNI CHASE |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 8 | BRIAN CHOI |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 9 | NICHOLAS FIRTH |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 10 | WILLIAM G FOULKE JR |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 11 | LLOYD GERRY |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 12 | ALEXANDRA KOTUR |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 13 | GERARDO MENDEZ |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 14 | HAPPY MENOCAL |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 15 | ROBERT MORSE |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 16 | JOHN S NEEDHAM |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 17 | NICKI DUGAN POGUE |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 18 | DANIEL T RYAN |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 19 | ASHLEY W SCHULTEN |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 20 | MARTIN TORRES |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 21 | HEATHER V WOLF |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 0 | 136432 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 1 | 105750 |
| 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 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 17 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 18 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 19 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 20 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 21 | 0 |
| 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/ReportableCompFromRltdOrgAmt | 18 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromRltdOrgAmt | 19 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromRltdOrgAmt | 20 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromRltdOrgAmt | 21 | 0 |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 0 | EXECUTIVE DI |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 1 | DEV DIRECTOR |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 2 | CHAIRMAN |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 3 | VICE CHAIRMA |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 4 | PRESIDENT |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 5 | TREASURER |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 6 | SECRETARY |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 7 | TRUSTEE |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 8 | TRUSTEE |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 9 | TRUSTEE |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 10 | TRUSTEE |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 11 | TRUSTEE |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 12 | TRUSTEE |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 13 | TRUSTEE |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 14 | TRUSTEE |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 15 | TRUSTEE |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 16 | TRUSTEE |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 17 | TRUSTEE |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 18 | TRUSTEE |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 19 | TRUSTEE |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 20 | TRUSTEE |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 21 | TRUSTEE |
| IRS990/Form990ProvidedToGvrnBodyInd | 0 | true |
| IRS990/FormationYr | 0 | 1989 |
| IRS990/FormerOfcrEmployeesListedInd | 0 | false |
| IRS990/FSAuditedBasisGrp/SeparateBasisFinclStmtInd | 0 | X |
| IRS990/FSAuditedInd | 0 | true |
| IRS990/FundraisingActivitiesInd | 0 | true |
| IRS990/FundraisingAmt | 0 | 127461 |
| IRS990/FundraisingDirectExpensesAmt | 0 | 23388 |
| IRS990/FundraisingGrossIncomeAmt | 0 | 19570 |
| IRS990/GainOrLossGrp/SecuritiesAmt | 0 | 54418 |
| IRS990/GamingActivitiesInd | 0 | false |
| IRS990/GoverningBodyVotingMembersCnt | 0 | 20 |
| IRS990/GovernmentGrantsAmt | 0 | 188342 |
| IRS990/GrantsToIndividualsInd | 0 | false |
| IRS990/GrantsToOrganizationsInd | 0 | false |
| IRS990/GrantToRelatedPersonInd | 0 | false |
| IRS990/GrossAmountSalesAssetsGrp/SecuritiesAmt | 0 | 1689889 |
| IRS990/GrossReceiptsAmt | 0 | 3116167 |
| IRS990/GroupReturnForAffiliatesInd | 0 | false |
| IRS990/IncludeFIN48FootnoteInd | 0 | true |
| IRS990/IndependentAuditFinclStmtInd | 0 | true |
| IRS990/IndependentVotingMemberCnt | 0 | 20 |
| IRS990/IndivRcvdGreaterThan100KCnt | 0 | 2 |
| IRS990/IndoorTanningServicesInd | 0 | false |
| IRS990/InfoInScheduleOPartIIIInd | 0 | X |
| IRS990/InfoInScheduleOPartVIInd | 0 | X |
| IRS990/InfoInScheduleOPartXIInd | 0 | X |
| IRS990/InsuranceGrp/FundraisingAmt | 0 | 1898 |
| IRS990/InsuranceGrp/ManagementAndGeneralAmt | 0 | 3795 |
| IRS990/InsuranceGrp/ProgramServicesAmt | 0 | 29794 |
| IRS990/InsuranceGrp/TotalAmt | 0 | 35487 |
| IRS990/InventoriesForSaleOrUseGrp/BOYAmt | 0 | 6906 |
| IRS990/InventoriesForSaleOrUseGrp/EOYAmt | 0 | 4606 |
| IRS990/InvestmentExpenseAmt | 0 | -11016 |
| IRS990/InvestmentIncomeGrp/ExclusionAmt | 0 | 101002 |
| IRS990/InvestmentIncomeGrp/TotalRevenueColumnAmt | 0 | 101002 |
| IRS990/InvestmentInJointVentureInd | 0 | false |
| IRS990/InvestmentsPubTradedSecGrp/BOYAmt | 0 | 3830559 |
| IRS990/InvestmentsPubTradedSecGrp/EOYAmt | 0 | 4148555 |
| IRS990/IRPDocumentCnt | 0 | 4 |
| IRS990/IRPDocumentW2GCnt | 0 | 0 |
| IRS990/LandBldgEquipAccumDeprecAmt | 0 | 282511 |
| IRS990/LandBldgEquipBasisNetGrp/BOYAmt | 0 | 22121557 |
| IRS990/LandBldgEquipBasisNetGrp/EOYAmt | 0 | 22474850 |
| IRS990/LandBldgEquipCostOrOtherBssAmt | 0 | 22757361 |
| IRS990/LegalDomicileStateCd | 0 | NY |
| IRS990/LessCostOthBasisSalesExpnssGrp/SecuritiesAmt | 0 | 1635471 |
| IRS990/LoanOutstandingInd | 0 | false |
| IRS990/LobbyingActivitiesInd | 0 | false |
| IRS990/LocalChaptersInd | 0 | false |
| IRS990/MaterialDiversionOrMisuseInd | 0 | false |
| IRS990/MembersOrStockholdersInd | 0 | false |
| IRS990/MethodOfAccountingAccrualInd | 0 | X |
| IRS990/MinutesOfCommitteesInd | 0 | true |
| IRS990/MinutesOfGoverningBodyInd | 0 | true |
| IRS990/MissionDesc | 0 | MIANUS RIVER GORGE, INC.'S MISSION IS TO PRESERVE, PROTECT, AND PROMOTE APPRECIATION OF THE NATURAL HERITAGE OF THE MIANUS RIVER WATERSHED THROUGH LAND ACQUISITION AND CONSERVATION, SCIENTIFIC RESEARCH AND PUBLIC EDUCATION THROUGHOUT THE REGION. |
| IRS990/MoreThan5000KToIndividualsInd | 0 | false |
| IRS990/MoreThan5000KToOrgInd | 0 | false |
| IRS990/NetAssetsOrFundBalancesBOYAmt | 0 | 26185473 |
| IRS990/NetAssetsOrFundBalancesEOYAmt | 0 | 26983120 |
| IRS990/NetGainOrLossInvestmentsGrp/ExclusionAmt | 0 | 54418 |
| IRS990/NetGainOrLossInvestmentsGrp/TotalRevenueColumnAmt | 0 | 54418 |
| IRS990/NetIncmFromFundraisingEvtGrp/TotalRevenueColumnAmt | 0 | -3818 |
| IRS990/NetUnrlzdGainsLossesInvstAmt | 0 | 405627 |
| IRS990/NoDonorRestrictionNetAssetsGrp/BOYAmt | 0 | 26079679 |
| IRS990/NoDonorRestrictionNetAssetsGrp/EOYAmt | 0 | 26798054 |
| IRS990/NoncashContributionsAmt | 0 | 356128 |
| IRS990/NondeductibleContributionsInd | 0 | false |
| IRS990/OccupancyGrp/FundraisingAmt | 0 | 1431 |
| IRS990/OccupancyGrp/ManagementAndGeneralAmt | 0 | 7487 |
| IRS990/OccupancyGrp/ProgramServicesAmt | 0 | 121608 |
| IRS990/OccupancyGrp/TotalAmt | 0 | 130526 |
| IRS990/OfficeExpensesGrp/FundraisingAmt | 0 | 18759 |
| IRS990/OfficeExpensesGrp/ManagementAndGeneralAmt | 0 | 5779 |
| IRS990/OfficeExpensesGrp/ProgramServicesAmt | 0 | 38031 |
| IRS990/OfficeExpensesGrp/TotalAmt | 0 | 62569 |
| IRS990/OfficerMailingAddressInd | 0 | false |
| IRS990/OperateHospitalInd | 0 | false |
| IRS990/Organization501c3Ind | 0 | X |
| IRS990/OrganizationFollowsFASB117Ind | 0 | X |
| IRS990/OtherEmployeeBenefitsGrp/FundraisingAmt | 0 | 9366 |
| IRS990/OtherEmployeeBenefitsGrp/ManagementAndGeneralAmt | 0 | 3058 |
| IRS990/OtherEmployeeBenefitsGrp/ProgramServicesAmt | 0 | 42236 |
| IRS990/OtherEmployeeBenefitsGrp/TotalAmt | 0 | 54660 |
| IRS990/OtherExpensesGrp/Desc | 0 | SPECIAL EVENTS |
| IRS990/OtherExpensesGrp/Desc | 1 | RESEARCH & EDUCATION |
| IRS990/OtherExpensesGrp/FundraisingAmt | 0 | 13988 |
| IRS990/OtherExpensesGrp/ProgramServicesAmt | 0 | 16876 |
| IRS990/OtherExpensesGrp/ProgramServicesAmt | 1 | 22929 |
| IRS990/OtherExpensesGrp/TotalAmt | 0 | 30864 |
| IRS990/OtherExpensesGrp/TotalAmt | 1 | 22929 |
| IRS990/OtherRevenueMiscGrp/Desc | 0 | OTHER |
| IRS990/OtherRevenueMiscGrp/RelatedOrExemptFuncIncomeAmt | 0 | 1260 |
| IRS990/OtherRevenueMiscGrp/TotalRevenueColumnAmt | 0 | 1260 |
| IRS990/OtherRevenueTotalAmt | 0 | 1260 |
| IRS990/OtherSalariesAndWagesGrp/FundraisingAmt | 0 | 107701 |
| IRS990/OtherSalariesAndWagesGrp/ManagementAndGeneralAmt | 0 | 40632 |
| IRS990/OtherSalariesAndWagesGrp/ProgramServicesAmt | 0 | 270524 |
| IRS990/OtherSalariesAndWagesGrp/TotalAmt | 0 | 418857 |
| IRS990/OtherWebsiteInd | 0 | X |
| IRS990/OwnWebsiteInd | 0 | X |
| IRS990/PartialLiquidationInd | 0 | false |
| IRS990/PayPremiumsPrsnlBnftCntrctInd | 0 | false |
| IRS990/PayrollTaxesGrp/FundraisingAmt | 0 | 9168 |
| IRS990/PayrollTaxesGrp/ManagementAndGeneralAmt | 0 | 4167 |
| IRS990/PayrollTaxesGrp/ProgramServicesAmt | 0 | 28337 |
| IRS990/PayrollTaxesGrp/TotalAmt | 0 | 41672 |
| IRS990/PensionPlanContributionsGrp/FundraisingAmt | 0 | 8273 |
| IRS990/PensionPlanContributionsGrp/ManagementAndGeneralAmt | 0 | 7294 |
| IRS990/PensionPlanContributionsGrp/ProgramServicesAmt | 0 | 51752 |
| IRS990/PensionPlanContributionsGrp/TotalAmt | 0 | 67319 |
| IRS990/PledgesAndGrantsReceivableGrp/BOYAmt | 0 | 20593 |
| IRS990/PledgesAndGrantsReceivableGrp/EOYAmt | 0 | 134604 |
| IRS990/PoliticalCampaignActyInd | 0 | false |
| IRS990/PrepaidExpensesDefrdChargesGrp/BOYAmt | 0 | 12310 |
| IRS990/PrepaidExpensesDefrdChargesGrp/EOYAmt | 0 | 15110 |
| IRS990/PrincipalOfficerNm | 0 | RODERICK CHRISTIE |
| IRS990/ProfessionalFundraisingInd | 0 | false |
| IRS990/ProgramServiceRevenueGrp/Desc | 0 | RESEARCH |
| IRS990/ProgramServiceRevenueGrp/RelatedOrExemptFuncIncomeAmt | 0 | 17350 |
| IRS990/ProgramServiceRevenueGrp/TotalRevenueColumnAmt | 0 | 17350 |
| IRS990/ProhibitedTaxShelterTransInd | 0 | false |
| IRS990/PYContributionsGrantsAmt | 0 | 617109 |
| IRS990/PYExcessBenefitTransInd | 0 | false |
| IRS990/PYInvestmentIncomeAmt | 0 | 1426974 |
| IRS990/PYOtherExpensesAmt | 0 | 368746 |
| IRS990/PYOtherRevenueAmt | 0 | 1386 |
| IRS990/PYProgramServiceRevenueAmt | 0 | 9602 |
| IRS990/PYRevenuesLessExpensesAmt | 0 | 1101593 |
| IRS990/PYSalariesCompEmpBnftPaidAmt | 0 | 584732 |
| IRS990/PYTotalExpensesAmt | 0 | 953478 |
| IRS990/PYTotalRevenueAmt | 0 | 2055071 |
| IRS990/QuidProQuoContributionsInd | 0 | true |
| IRS990/QuidProQuoContriDisclInd | 0 | true |
| IRS990/RcvFndsToPayPrsnlBnftCntrctInd | 0 | false |
| IRS990/ReconcilationRevenueExpnssAmt | 0 | 403036 |
| IRS990/RegularMonitoringEnfrcInd | 0 | true |
| IRS990/RelatedEntityInd | 0 | false |
| IRS990/RelatedOrganizationCtrlEntInd | 0 | false |
| IRS990/ReportInvestmentsOtherSecInd | 0 | false |
| IRS990/ReportLandBuildingEquipmentInd | 0 | true |
| IRS990/ReportOtherAssetsInd | 0 | false |
| IRS990/ReportOtherLiabilitiesInd | 0 | false |
| IRS990/ReportProgramRelatedInvstInd | 0 | false |
| IRS990/RevenueAmt | 0 | 17350 |
| IRS990/SavingsAndTempCashInvstGrp/BOYAmt | 0 | 227615 |
| IRS990/SavingsAndTempCashInvstGrp/EOYAmt | 0 | 196025 |
| IRS990ScheduleA/Form990ScheduleAPartVIGrp/ExplanationTxt | 0 | 26,938 |
| IRS990ScheduleA/Form990ScheduleAPartVIGrp/FormAndLineReferenceDesc | 0 | PART II, LINE 10 |
| IRS990ScheduleA/GiftsGrantsContriRcvd170Grp/CurrentTaxYearAmt | 0 | 1287096 |
| IRS990ScheduleA/GiftsGrantsContriRcvd170Grp/CurrentTaxYearMinus1YearAmt | 0 | 617109 |
| IRS990ScheduleA/GiftsGrantsContriRcvd170Grp/CurrentTaxYearMinus2YearsAmt | 0 | 738081 |
| IRS990ScheduleA/GiftsGrantsContriRcvd170Grp/CurrentTaxYearMinus3YearsAmt | 0 | 2177839 |
| IRS990ScheduleA/GiftsGrantsContriRcvd170Grp/CurrentTaxYearMinus4YearsAmt | 0 | 406249 |
| IRS990ScheduleA/GiftsGrantsContriRcvd170Grp/TotalAmt | 0 | 5226374 |
| IRS990ScheduleA/GrossInvestmentIncome170Grp/CurrentTaxYearAmt | 0 | 101002 |
| IRS990ScheduleA/GrossInvestmentIncome170Grp/CurrentTaxYearMinus1YearAmt | 0 | 85421 |
| IRS990ScheduleA/GrossInvestmentIncome170Grp/CurrentTaxYearMinus2YearsAmt | 0 | 76966 |
| IRS990ScheduleA/GrossInvestmentIncome170Grp/CurrentTaxYearMinus3YearsAmt | 0 | 87263 |
| IRS990ScheduleA/GrossInvestmentIncome170Grp/CurrentTaxYearMinus4YearsAmt | 0 | 110383 |
| IRS990ScheduleA/GrossInvestmentIncome170Grp/TotalAmt | 0 | 461035 |
| IRS990ScheduleA/GrossReceiptsRltdActivitiesAmt | 0 | 68207 |
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