Liabilities / Assets
28th percentile
Higher debt load relative to assets than 28% of similar nonprofits.
EIN 04-3268863 • 501(c)3 • Boston, MA
Profile
Our mission is to ensure that the people of greater boston benefit from a vibrant, resilient, and inclusive waterfront, harbor, and islands; these spaces are equitable, accessible, and adapted to climate change; and to ensure our public, environmental, and economic health and well-being.
Precomputed percentiles relative to similar nonprofits. These scores are descriptive rather than judgmental.
Liabilities / Assets
28th percentile
Higher debt load relative to assets than 28% of similar nonprofits.
Liabilities / Revenue
19th percentile
Higher debt load relative to revenue than 19% of similar nonprofits.
Net Margin
88th percentile
Higher net margin than 88% of similar nonprofits.
Top Officer Pay
78th percentile
Higher top officer pay than 78% of similar nonprofits.
Top officer pay equals 3.0% of source-year revenue.
Asset Growth
97th percentile
Faster asset growth than 97% of similar nonprofits.
Revenue Growth
88th percentile
Faster revenue growth than 88% of similar nonprofits.
Assets
Up$9,729,333
Up $4,787,831 (+97%) from 2024
Liabilities
Up$426,607
Up $116,694 (+38%) from 2024
Net Assets
Up$9,302,726
Up $4,671,137 (+101%) from 2024
Revenue
Up$10,122,273
Up $4,045,184 (+67%) from 2024
Expenses
Up$5,450,425
Up $538,508 (+11%) from 2024
Net Income
Up$4,671,848
Up $3,506,676 (+301%) from 2024
Most recent year
2025 • Form 990Facts available. Structured filing facts are available, but richer extracted sections are limited.
Boston harbor now's (bhn) mission is to ensure that boston harbor, its waterfront and islands are accessible and inclusive and that these special places are properly adapted to the risks of climate change.we accomplish this by: advancing a broad vision for development on the harbor; offering everyone opportunities to utilize and enjoy the harbor, waterfront and islands; researching effective measures to protect the islands and the greater boston region from sea level rise; andpartnering with federal, state, municipal governments and nonprofits to implement programs and projects consistent with the above.
Our mission is to ensure that the people of greater boston benefit from a vibrant, resilient, and inclusive waterfront, harbor, and islands; these spaces are equitable, accessible, and adapted to climate change; and to ensure our public, environmental, and economic health and well-being.
| Line | Beginning | End | Change |
|---|---|---|---|
| Assets | |||
| Pledges and Grants Receivable | $1,913,637 | $4,587,625 | ▲ $2,673,988 |
| Savings and Temporary Cash Investments | $2,408,411 | $4,304,774 | ▲ $1,896,363 |
| Cash and Non-Interest-Bearing Accounts | $369,648 | $432,741 | ▲ $63,093 |
| Land, Buildings, and Equipment, Net | $92,996 | $190,291 | ▲ $97,295 |
| Prepaid Expenses and Deferred Charges | $86,965 | $99,471 | ▲ $12,506 |
| Investments Other Securities | $69,845 | $69,665 | ▼ $180 |
| Investments in Publicly Traded Securities | - | $44,766 | - |
| Total Assets | $4,941,502 | $9,729,333 | ▲ $4,787,831 |
| Liabilities | |||
| Accounts Payable and Accrued Expenses | $309,913 | $426,607 | ▲ $116,694 |
| Total Liabilities | $309,913 | $426,607 | ▲ $116,694 |
| Net Assets / Fund Balance | |||
| Net Assets With Donor Restrictions | $3,921,623 | $8,547,143 | ▲ $4,625,520 |
| Net Assets Without Donor Restrictions | $709,966 | $755,583 | ▲ $45,617 |
| Total Net Assets Fund Balance | $4,631,589 | $9,302,726 | ▲ $4,671,137 |
| Total Liabilities and Net Assets / Fund Balance | $4,941,502 | $9,729,333 | ▲ $4,787,831 |
| Asset | Book Value | Depreciation | Basis |
|---|---|---|---|
| Equipment | $73,111 | $92,144 | $165,255 |
| Other Land Buildings | $117,180 | - | $117,180 |
| Name | Title | Full / Part Time | Base | Other | Total |
|---|---|---|---|---|---|
| Katherine Abbott | President and CEO | FT | $278,486 | $27,229 | $305,715 |
| Janine Dailey | Chief Advancement Officer | FT | $182,411 | $9,688 | $192,099 |
| Alankrita Narang | Chief Operating Officer | FT | $129,234 | $12,144 | $141,378 |
| Joseph Christo | Mgmt. Dir., Stone Living Lab | FT | $128,991 | $9,577 | $138,568 |
| Rebecca Smerling | Director - Public Programs | FT | $103,992 | $25,448 | $129,440 |
| Buttra Christian Merfeld | Director - Communications | FT | $106,661 | $19,087 | $125,748 |
| Name | Title |
|---|---|
| Meaghan Hooper-berdik | Chair |
| Mary Kay Leonard | Chair, Board of Advisors |
| Bob Delhome | Vice Chair |
| Andrew Mcelwee | Director |
| Ann Lagasse | Director |
| Bethany Card | Director |
| Betsy Wall | Director |
| Bud Ris | Director |
| Grace Macomber Bird | Director |
| Greg Herrema | Director |
| James Miner | Director |
| Jamie Fay | Director |
| Kevin Clarke | Director |
| Kishore Varanasi | Director |
| MARTIN O'NEILL | Director |
| Malia Lazu | Director |
| Nalini Sharma | Director |
| Richard Walker | Director |
| Shelagh Mahoney | Director |
| Bob Golledge | Director (until 10/2024) |
| Demetriouse Russell | Director (until 3/2025) |
| Cathy Stone | Clerk |
| Elaine Richardson | Treasurer |
| Contractor | Services | Location | Compensation |
|---|---|---|---|
| Carroll Biel LLC | Consulting Services | 88 ARSENAL YARDS BLVD APT 620, Watertown, MA 02472 | $144,000 |
| Contribution Type | Contribution Count | Reported Amount | Valuation Method |
|---|---|---|---|
| Food Inventory | 7 | $27,949 | Fair Market Value (FMV) |
| Total Noncash Contributions | 7 | $27,949 | - |
| Line Item | Amount |
|---|---|
| Other Expenses | $2,800,111 |
| Salaries, Compensation, and Employee Benefits | $2,586,821 |
| Total Fundraising Expense | $541,616 |
| Professional Fundraising Fees | $63,493 |
| Grants and Similar Amounts Paid | $0 |
| Line Item | Program | Management | Fundraising | Total |
|---|---|---|---|---|
| Other Salaries and Wages | $1,282,875 | $241,459 | $326,156 | $1,850,490 |
| Fees for Services Other | $374,854 | $108,250 | $11,840 | $494,944 |
| Other Expenses | $320,074 | $3,000 | $3,384 | $323,074 |
| Current Officers, Directors, Trustees, and Key Employees | $156,900 | $125,519 | $31,380 | $313,799 |
| Other Employee Benefits | $133,782 | $33,290 | $33,975 | $201,047 |
| Payroll Taxes | $133,313 | $33,428 | $32,210 | $198,951 |
| Fees for Services Accounting | - | $106,423 | - | $106,423 |
| All Other Expenses | $14,963 | $39,064 | $11,039 | $65,066 |
| Fees for Services Professional Fundraising | - | - | $63,493 | $63,493 |
| Occupancy | $46,298 | $9,188 | - | $55,486 |
| Information Technology | $31,762 | $7,365 | $15,366 | $54,493 |
| Office Expenses | $21,016 | $24,250 | $5,821 | $51,087 |
| Insurance | - | $46,310 | - | $46,310 |
| Depreciation Depletion | - | $27,075 | - | $27,075 |
| Travel | $13,599 | $10,946 | $434 | $24,979 |
| Pension Plan Contributions | $18,078 | $898 | $3,558 | $22,534 |
| Fees for Services Lobbying | $20,000 | - | - | $20,000 |
| Advertising | $10,052 | - | $2,960 | $13,012 |
| Total Functional Expenses | $4,092,203 | $816,606 | $541,616 | $5,450,425 |
| Line Item | Amount |
|---|---|
| Total Expenses per Audited Statements | $5,760,856 |
| Expenses per Audited Statements | $5,450,425 |
| Total Expenses per Form 990 | $5,450,425 |
| Expenses Not Reported on Form 990 | $310,431 |
| Expenses Not Reported on Financial Statements | $0 |
| Line Item | Amount |
|---|---|
| Fundraising Direct Expenses | $375,877 |
| Fundraising Gross Income | $111,750 |
| Professional Fundraising Fees | $63,493 |
| Event | Gross Receipts | Gross Revenue | Direct Expenses | Net Income |
|---|---|---|---|---|
| Spectacle on Spectacle | $892,613 | $82,050 | $306,543 | $-224,493 |
| Onboard Awards | $262,684 | $29,700 | $69,334 | $-39,634 |
| Total Events | $1,155,297 | $111,750 | $375,877 | $-264,127 |
“The president & ceo, chief operating officer, and the finance/audit committee review a draft of the form 990 as prepared by independent tax professionals and discuss any questions/issues with the tax professionals. Once they accept the draft, the return is filed.”
“Our conflict of interest policy requires board and staff to disclose any potential conflict of interest. Conflict of interest forms are completed at the start of each fiscal year and updated as need be. If the matter involves staff and is relatively minor, the president makes a decision on what course of action the staff member should follow. If the matter involves a board member or is a major issue involving staff, the president and executive committee discuss the question, and make a recommendation to the full board. Alternatively, a board member may recuse themselves from any boston harbor now participation in a matter that they believe raises a conflict or the appearance of a conflict.”
“The president and ceo's salaries are determined by the board of trustees. The review is based on an online analysis of comparable salaries, a self-evaluation provided by the president, their own internal conversations, and conversations with additional board members as well as conversations with their direct reports. Other officers and key employees' salaries are determined by the president and ceo.”
“Documents are made available upon request. Financial statements are also available on the organization's website.”
“This process has not changed from the prior year.”
“Income taxes bhn accounts for uncertainty in income taxes in accordance with asc topic, income taxes. This standard clarifies the accounting for uncertainty in tax positions and prescribes a recognition threshold and measurement attribute for the financial statements regarding a tax position taken or expected to be taken in a tax return. Bhn has determined that there are no uncertain tax positions which qualify for either recognition or disclosure in the financial statements at march 31, 2025 and 2024. Bhn's information and tax returns are subject to examination by federal and state jurisdictions.”
“Special event expenses -264,127.”
“Special event expenses 264,127.”
This appendix keeps the raw XML leaves available for debugging and edge-case review. The human report above is the primary experience.
| Path | # | Value |
|---|---|---|
| IRS990/AccountantCompileOrReviewInd | 0 | 0 |
| IRS990/AccountsPayableAccrExpnssGrp/BOYAmt | 0 | 309913 |
| IRS990/AccountsPayableAccrExpnssGrp/EOYAmt | 0 | 426607 |
| IRS990/ActivitiesConductedPrtshpInd | 0 | 0 |
| IRS990/ActivityOrMissionDesc | 0 | OUR MISSION IS TO ENSURE THAT THE PEOPLE OF GREATER BOSTON BENEFIT FROM A VIBRANT, RESILIENT, AND INCLUSIVE WATERFRONT, HARBOR, AND ISLANDS; THESE SPACES ARE EQUITABLE, ACCESSIBLE, AND ADAPTED TO CLIMATE CHANGE; AND TO ENSURE OUR PUBLIC, ENVIRONMENTAL, AND ECONOMIC HEALTH AND WELL-BEING. |
| IRS990/AdvertisingGrp/FundraisingAmt | 0 | 2960 |
| IRS990/AdvertisingGrp/ProgramServicesAmt | 0 | 10052 |
| IRS990/AdvertisingGrp/TotalAmt | 0 | 13012 |
| IRS990/AllOtherContributionsAmt | 0 | 3511037 |
| IRS990/AllOtherExpensesGrp/FundraisingAmt | 0 | 11039 |
| IRS990/AllOtherExpensesGrp/ManagementAndGeneralAmt | 0 | 39064 |
| IRS990/AllOtherExpensesGrp/ProgramServicesAmt | 0 | 14963 |
| IRS990/AllOtherExpensesGrp/TotalAmt | 0 | 65066 |
| IRS990/AnnualDisclosureCoveredPrsnInd | 0 | 1 |
| IRS990/AuditCommitteeInd | 0 | 1 |
| IRS990/BackupWthldComplianceInd | 0 | 1 |
| IRS990/BooksInCareOfDetail/BusinessName/BusinessNameLine1Txt | 0 | BOSTON HARBOR NOW |
| IRS990/BooksInCareOfDetail/PhoneNum | 0 | 5083773003 |
| IRS990/BooksInCareOfDetail/USAddress/AddressLine1Txt | 0 | 15 STATE STREET 1100 |
| IRS990/BooksInCareOfDetail/USAddress/CityNm | 0 | BOSTON |
| IRS990/BooksInCareOfDetail/USAddress/StateAbbreviationCd | 0 | MA |
| IRS990/BooksInCareOfDetail/USAddress/ZIPCd | 0 | 02109 |
| IRS990/BusinessRlnWith35CtrlEntInd | 0 | 0 |
| IRS990/BusinessRlnWithFamMemInd | 0 | 0 |
| IRS990/BusinessRlnWithOrgMemInd | 0 | 0 |
| IRS990/CashNonInterestBearingGrp/BOYAmt | 0 | 369648 |
| IRS990/CashNonInterestBearingGrp/EOYAmt | 0 | 432741 |
| IRS990/ChangeToOrgDocumentsInd | 0 | 0 |
| IRS990/CntrctRcvdGreaterThan100KCnt | 0 | 1 |
| IRS990/CollectionsOfArtInd | 0 | 0 |
| IRS990/CompCurrentOfcrDirectorsGrp/FundraisingAmt | 0 | 31380 |
| IRS990/CompCurrentOfcrDirectorsGrp/ManagementAndGeneralAmt | 0 | 125519 |
| IRS990/CompCurrentOfcrDirectorsGrp/ProgramServicesAmt | 0 | 156900 |
| IRS990/CompCurrentOfcrDirectorsGrp/TotalAmt | 0 | 313799 |
| IRS990/CompensationFromOtherSrcsInd | 0 | 0 |
| IRS990/CompensationProcessCEOInd | 0 | 1 |
| IRS990/CompensationProcessOtherInd | 0 | 0 |
| IRS990/ConflictOfInterestPolicyInd | 0 | 1 |
| IRS990/ConservationEasementsInd | 0 | 0 |
| IRS990/ConsolidatedAuditFinclStmtInd | 0 | 0 |
| IRS990/ContractorCompensationGrp/CompensationAmt | 0 | 144000 |
| IRS990/ContractorCompensationGrp/ContractorAddress/USAddress/AddressLine1Txt | 0 | 88 ARSENAL YARDS BLVD APT 620 |
| IRS990/ContractorCompensationGrp/ContractorAddress/USAddress/CityNm | 0 | WATERTOWN |
| IRS990/ContractorCompensationGrp/ContractorAddress/USAddress/StateAbbreviationCd | 0 | MA |
| IRS990/ContractorCompensationGrp/ContractorAddress/USAddress/ZIPCd | 0 | 02472 |
| IRS990/ContractorCompensationGrp/ContractorName/BusinessName/BusinessNameLine1Txt | 0 | CARROLL BIEL LLC |
| IRS990/ContractorCompensationGrp/ServicesDesc | 0 | CONSULTING SERVICES |
| IRS990/ContriRptFundraisingEventAmt | 0 | 1043547 |
| IRS990/CreditCounselingInd | 0 | 0 |
| IRS990/CYBenefitsPaidToMembersAmt | 0 | 0 |
| IRS990/CYContributionsGrantsAmt | 0 | 10059619 |
| IRS990/CYGrantsAndSimilarPaidAmt | 0 | 0 |
| IRS990/CYInvestmentIncomeAmt | 0 | 150700 |
| IRS990/CYOtherExpensesAmt | 0 | 2800111 |
| IRS990/CYOtherRevenueAmt | 0 | -264127 |
| IRS990/CYProgramServiceRevenueAmt | 0 | 176081 |
| IRS990/CYRevenuesLessExpensesAmt | 0 | 4671848 |
| IRS990/CYSalariesCompEmpBnftPaidAmt | 0 | 2586821 |
| IRS990/CYTotalExpensesAmt | 0 | 5450425 |
| IRS990/CYTotalFundraisingExpenseAmt | 0 | 541616 |
| IRS990/CYTotalProfFndrsngExpnsAmt | 0 | 63493 |
| IRS990/CYTotalRevenueAmt | 0 | 10122273 |
| IRS990/DecisionsSubjectToApprovaInd | 0 | 0 |
| IRS990/DeductibleArtContributionInd | 0 | 0 |
| IRS990/DeductibleNonCashContriInd | 0 | 1 |
| IRS990/DelegationOfMgmtDutiesInd | 0 | 0 |
| IRS990/DepreciationDepletionGrp/ManagementAndGeneralAmt | 0 | 27075 |
| IRS990/DepreciationDepletionGrp/TotalAmt | 0 | 27075 |
| IRS990/Desc | 0 | BOSTON HARBOR NOW, INC. (BHN), AS THE NON-PROFIT PARTNER OF THE BOSTON HARBOR ISLANDS NATIONAL AND STATE PARK, MANAGES A NUMBER OF OPERATIONS, FACILITIES, AND REVENUE-GENERATING SERVICES TO ENHANCE VISITOR EXPERIENCE AND PROVIDE FUNDING TO SUPPORT THE PARK. MANAGED SERVICES INCLUDE PUBLIC FERRY OPERATIONS, ISLAND-BASED FOOD SERVICE AND PRIVATE EVENTS. IN ADDITION, BHN MANAGES THE MAINLAND PARK WELCOME CENTER LOCATED IN BOSTON ON BEHALF OF THE NATIONAL PARK SERVICE. BHN ALSO ORGANIZES PROGRAMMING, PROVIDES FREE AND REDUCED COST ACCESS TO UNDERSERVED YOUTH AND FAMILIES, AND WORKS WITH MANY COMMUNITY PARTNERS AND NONPROFITS TO INCREASE USE AND APPRECIATION OF THE HARBOR. |
| IRS990/DescribedInSection501c3Ind | 0 | 1 |
| IRS990/DisregardedEntityInd | 0 | 0 |
| IRS990/DocumentRetentionPolicyInd | 0 | 0 |
| IRS990/DonorAdvisedFundInd | 0 | 0 |
| IRS990/DonorRestrictionNetAssetsGrp/BOYAmt | 0 | 3921623 |
| IRS990/DonorRestrictionNetAssetsGrp/EOYAmt | 0 | 8547143 |
| IRS990/DonorRstrOrQuasiEndowmentsInd | 0 | 0 |
| IRS990/ElectionOfBoardMembersInd | 0 | 0 |
| IRS990/EmployeeCnt | 0 | 33 |
| IRS990/EmploymentTaxReturnsFiledInd | 0 | 1 |
| IRS990/EngagedInExcessBenefitTransInd | 0 | 0 |
| IRS990/ExpenseAmt | 0 | 2163368 |
| IRS990/FamilyOrBusinessRlnInd | 0 | 0 |
| IRS990/FederalGrantAuditRequiredInd | 0 | 0 |
| IRS990/FeesForServicesAccountingGrp/ManagementAndGeneralAmt | 0 | 106423 |
| IRS990/FeesForServicesAccountingGrp/TotalAmt | 0 | 106423 |
| IRS990/FeesForServicesLobbyingGrp/ProgramServicesAmt | 0 | 20000 |
| IRS990/FeesForServicesLobbyingGrp/TotalAmt | 0 | 20000 |
| IRS990/FeesForServicesOtherGrp/FundraisingAmt | 0 | 11840 |
| IRS990/FeesForServicesOtherGrp/ManagementAndGeneralAmt | 0 | 108250 |
| IRS990/FeesForServicesOtherGrp/ProgramServicesAmt | 0 | 374854 |
| IRS990/FeesForServicesOtherGrp/TotalAmt | 0 | 494944 |
| IRS990/FeesForServicesProfFundraising/FundraisingAmt | 0 | 63493 |
| IRS990/FeesForServicesProfFundraising/TotalAmt | 0 | 63493 |
| IRS990/ForeignActivitiesInd | 0 | 0 |
| IRS990/ForeignFinancialAccountInd | 0 | 0 |
| IRS990/ForeignOfficeInd | 0 | 0 |
| IRS990/Form8282PropertyDisposedOfInd | 0 | 0 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 0 | 5.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 1 | 3.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 2 | 3.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 3 | 3.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 4 | 3.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 5 | 1.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 6 | 1.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 7 | 1.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 8 | 1.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 9 | 1.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 10 | 1.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 11 | 1.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 12 | 1.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 13 | 1.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 14 | 1.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 15 | 1.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 16 | 1.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 17 | 1.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 18 | 1.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 19 | 1.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 20 | 1.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 21 | 1.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 22 | 1.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 23 | 40.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 24 | 40.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 25 | 40.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 26 | 40.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 27 | 40.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 28 | 40.00 |
| IRS990/Form990PartVIISectionAGrp/HighestCompensatedEmployeeInd | 0 | X |
| IRS990/Form990PartVIISectionAGrp/HighestCompensatedEmployeeInd | 1 | X |
| IRS990/Form990PartVIISectionAGrp/HighestCompensatedEmployeeInd | 2 | X |
| IRS990/Form990PartVIISectionAGrp/HighestCompensatedEmployeeInd | 3 | X |
| IRS990/Form990PartVIISectionAGrp/HighestCompensatedEmployeeInd | 4 | X |
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| IRS990/Form990PartVIISectionAGrp/IndividualTrusteeOrDirectorInd | 1 | X |
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| IRS990/Form990PartVIISectionAGrp/IndividualTrusteeOrDirectorInd | 15 | X |
| IRS990/Form990PartVIISectionAGrp/IndividualTrusteeOrDirectorInd | 16 | X |
| IRS990/Form990PartVIISectionAGrp/IndividualTrusteeOrDirectorInd | 17 | X |
| IRS990/Form990PartVIISectionAGrp/IndividualTrusteeOrDirectorInd | 18 | X |
| IRS990/Form990PartVIISectionAGrp/IndividualTrusteeOrDirectorInd | 19 | X |
| IRS990/Form990PartVIISectionAGrp/IndividualTrusteeOrDirectorInd | 20 | X |
| IRS990/Form990PartVIISectionAGrp/IndividualTrusteeOrDirectorInd | 21 | X |
| IRS990/Form990PartVIISectionAGrp/IndividualTrusteeOrDirectorInd | 22 | 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/OtherCompensationAmt | 0 | 0 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 1 | 0 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 2 | 0 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 3 | 0 |
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| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 9 | 0 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 10 | 0 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 11 | 0 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 12 | 0 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 13 | 0 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 14 | 0 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 15 | 0 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 16 | 0 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 17 | 0 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 18 | 0 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 19 | 0 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 20 | 0 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 21 | 0 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 22 | 0 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 23 | 17229 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 24 | 9688 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 25 | 12144 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 26 | 9577 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 27 | 25448 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 28 | 19087 |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 0 | MEAGHAN HOOPER-BERDIK |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 1 | BOB DELHOME |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 2 | ELAINE RICHARDSON |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 3 | CATHY STONE |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 4 | MARY KAY LEONARD |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 5 | GRACE MACOMBER BIRD |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 6 | KISHORE VARANASI |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 7 | MARTIN O'NEILL |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 8 | MALIA LAZU |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 9 | SHELAGH MAHONEY |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 10 | ANN LAGASSE |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 11 | ANDREW MCELWEE |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 12 | BUD RIS |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 13 | GREG HERREMA |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 14 | JAMES MINER |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 15 | JAMIE FAY |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 16 | KEVIN CLARKE |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 17 | NALINI SHARMA |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 18 | RICHARD WALKER |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 19 | BETHANY CARD |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 20 | DEMETRIOUSE RUSSELL |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 21 | BOB GOLLEDGE |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 22 | BETSY WALL |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 23 | KATHERINE ABBOTT |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 24 | JANINE DAILEY |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 25 | ALANKRITA NARANG |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 26 | JOSEPH CHRISTO |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 27 | REBECCA SMERLING |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 28 | BUTTRA CHRISTIAN MERFELD |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 0 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 1 | 0 |
| 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/ReportableCompFromOrgAmt | 22 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 23 | 288486 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 24 | 182411 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 25 | 129234 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 26 | 128991 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 27 | 103992 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 28 | 106661 |
| 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/ReportableCompFromRltdOrgAmt | 22 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromRltdOrgAmt | 23 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromRltdOrgAmt | 24 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromRltdOrgAmt | 25 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromRltdOrgAmt | 26 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromRltdOrgAmt | 27 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromRltdOrgAmt | 28 | 0 |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 0 | CHAIR |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 1 | VICE CHAIR |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 2 | TREASURER |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 3 | CLERK |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 4 | CHAIR, BOARD OF ADVISORS |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 5 | DIRECTOR |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 6 | DIRECTOR |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 7 | DIRECTOR |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 8 | DIRECTOR |
| 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 | DIRECTOR |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 17 | DIRECTOR |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 18 | DIRECTOR |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 19 | DIRECTOR |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 20 | DIRECTOR (UNTIL 3/2025) |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 21 | DIRECTOR (UNTIL 10/2024) |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 22 | DIRECTOR |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 23 | PRESIDENT AND CEO |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 24 | CHIEF ADVANCEMENT OFFICER |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 25 | CHIEF OPERATING OFFICER |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 26 | MGMT. DIR., STONE LIVING LAB |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 27 | DIRECTOR - PUBLIC PROGRAMS |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 28 | DIRECTOR - COMMUNICATIONS |
| IRS990/Form990ProvidedToGvrnBodyInd | 0 | 1 |
| IRS990/FormationYr | 0 | 1995 |
| IRS990/FormerOfcrEmployeesListedInd | 0 | 0 |
| IRS990/FSAuditedBasisGrp/SeparateBasisFinclStmtInd | 0 | X |
| IRS990/FSAuditedInd | 0 | 1 |
| IRS990/FundraisingActivitiesInd | 0 | 1 |
| IRS990/FundraisingAmt | 0 | 1043547 |
| IRS990/FundraisingDirectExpensesAmt | 0 | 375877 |
| IRS990/FundraisingGrossIncomeAmt | 0 | 111750 |
| IRS990/GamingActivitiesInd | 0 | 0 |
| IRS990/GoverningBodyVotingMembersCnt | 0 | 21 |
| IRS990/GovernmentGrantsAmt | 0 | 5505035 |
| IRS990/GrantsToIndividualsInd | 0 | 0 |
| IRS990/GrantsToOrganizationsInd | 0 | 0 |
| IRS990/GrantToRelatedPersonInd | 0 | 0 |
| IRS990/GrossReceiptsAmt | 0 | 10498150 |
| IRS990/GroupReturnForAffiliatesInd | 0 | 0 |
| IRS990/IncludeFIN48FootnoteInd | 0 | 1 |
| IRS990/IndependentAuditFinclStmtInd | 0 | 1 |
| IRS990/IndependentVotingMemberCnt | 0 | 21 |
| IRS990/IndivRcvdGreaterThan100KCnt | 0 | 6 |
| IRS990/IndoorTanningServicesInd | 0 | 0 |
| IRS990/InfoInScheduleOPartIIIInd | 0 | X |
| IRS990/InfoInScheduleOPartVIInd | 0 | X |
| IRS990/InfoInScheduleOPartXIIInd | 0 | X |
| IRS990/InformationTechnologyGrp/FundraisingAmt | 0 | 15366 |
| IRS990/InformationTechnologyGrp/ManagementAndGeneralAmt | 0 | 7365 |
| IRS990/InformationTechnologyGrp/ProgramServicesAmt | 0 | 31762 |
| IRS990/InformationTechnologyGrp/TotalAmt | 0 | 54493 |
| IRS990/InsuranceGrp/ManagementAndGeneralAmt | 0 | 46310 |
| IRS990/InsuranceGrp/TotalAmt | 0 | 46310 |
| IRS990/InvestmentIncomeGrp/ExclusionAmt | 0 | 150700 |
| IRS990/InvestmentIncomeGrp/TotalRevenueColumnAmt | 0 | 150700 |
| IRS990/InvestmentInJointVentureInd | 0 | 0 |
| IRS990/InvestmentsOtherSecuritiesGrp/BOYAmt | 0 | 69845 |
| IRS990/InvestmentsOtherSecuritiesGrp/EOYAmt | 0 | 69665 |
| IRS990/InvestmentsPubTradedSecGrp/EOYAmt | 0 | 44766 |
| IRS990/IRPDocumentCnt | 0 | 79 |
| IRS990/IRPDocumentW2GCnt | 0 | 0 |
| IRS990/LandBldgEquipAccumDeprecAmt | 0 | 92144 |
| IRS990/LandBldgEquipBasisNetGrp/BOYAmt | 0 | 92996 |
| IRS990/LandBldgEquipBasisNetGrp/EOYAmt | 0 | 190291 |
| IRS990/LandBldgEquipCostOrOtherBssAmt | 0 | 282435 |
| IRS990/LegalDomicileStateCd | 0 | MA |
| IRS990/LoanOutstandingInd | 0 | 0 |
| IRS990/LobbyingActivitiesInd | 0 | 1 |
| IRS990/LocalChaptersInd | 0 | 0 |
| IRS990/MaterialDiversionOrMisuseInd | 0 | 0 |
| IRS990/MembersOrStockholdersInd | 0 | 0 |
| IRS990/MethodOfAccountingAccrualInd | 0 | X |
| IRS990/MinutesOfCommitteesInd | 0 | 1 |
| IRS990/MinutesOfGoverningBodyInd | 0 | 1 |
| IRS990/MissionDesc | 0 | OUR MISSION IS TO ENSURE THAT THE PEOPLE OF GREATER BOSTON BENEFIT FROM A VIBRANT, RESILIENT, AND INCLUSIVE WATERFRONT, HARBOR, AND ISLANDS; THESE SPACES ARE EQUITABLE, ACCESSIBLE, AND ADAPTED TO CLIMATE CHANGE; AND TO ENSURE OUR PUBLIC, ENVIRONMENTAL, AND ECONOMIC HEALTH AND WELL-BEING. |
| IRS990/MoreThan5000KToIndividualsInd | 0 | 0 |
| IRS990/MoreThan5000KToOrgInd | 0 | 0 |
| IRS990/NetAssetsOrFundBalancesBOYAmt | 0 | 4631589 |
| IRS990/NetAssetsOrFundBalancesEOYAmt | 0 | 9302726 |
| IRS990/NetIncmFromFundraisingEvtGrp/ExclusionAmt | 0 | -264127 |
| IRS990/NetIncmFromFundraisingEvtGrp/TotalRevenueColumnAmt | 0 | -264127 |
| IRS990/NetUnrelatedBusTxblIncmAmt | 0 | 0 |
| IRS990/NetUnrlzdGainsLossesInvstAmt | 0 | -711 |
| IRS990/NoDonorRestrictionNetAssetsGrp/BOYAmt | 0 | 709966 |
| IRS990/NoDonorRestrictionNetAssetsGrp/EOYAmt | 0 | 755583 |
| IRS990/NoncashContributionsAmt | 0 | 27949 |
| IRS990/NondeductibleContributionsInd | 0 | 0 |
| IRS990/OccupancyGrp/ManagementAndGeneralAmt | 0 | 9188 |
| IRS990/OccupancyGrp/ProgramServicesAmt | 0 | 46298 |
| IRS990/OccupancyGrp/TotalAmt | 0 | 55486 |
| IRS990/OfficeExpensesGrp/FundraisingAmt | 0 | 5821 |
| IRS990/OfficeExpensesGrp/ManagementAndGeneralAmt | 0 | 24250 |
| IRS990/OfficeExpensesGrp/ProgramServicesAmt | 0 | 21016 |
| IRS990/OfficeExpensesGrp/TotalAmt | 0 | 51087 |
| IRS990/OfficerMailingAddressInd | 0 | 0 |
| IRS990/OperateHospitalInd | 0 | 0 |
| IRS990/Organization501c3Ind | 0 | X |
| IRS990/OrganizationFollowsFASB117Ind | 0 | X |
| IRS990/OtherChangesInNetAssetsAmt | 0 | 0 |
| IRS990/OtherEmployeeBenefitsGrp/FundraisingAmt | 0 | 33975 |
| IRS990/OtherEmployeeBenefitsGrp/ManagementAndGeneralAmt | 0 | 33290 |
| IRS990/OtherEmployeeBenefitsGrp/ProgramServicesAmt | 0 | 133782 |
| IRS990/OtherEmployeeBenefitsGrp/TotalAmt | 0 | 201047 |
| IRS990/OtherExpensesGrp/Desc | 0 | PROJECT EXPENSES |
| IRS990/OtherExpensesGrp/Desc | 1 | PROGRAM COSTS |
| IRS990/OtherExpensesGrp/Desc | 2 | HARBOR IMPROVEMENTS |
| IRS990/OtherExpensesGrp/Desc | 3 | WATER TRANSPORTATION |
| IRS990/OtherExpensesGrp/FundraisingAmt | 0 | 3384 |
| IRS990/OtherExpensesGrp/ManagementAndGeneralAmt | 0 | 25 |
| IRS990/OtherExpensesGrp/ManagementAndGeneralAmt | 1 | 116 |
| IRS990/OtherExpensesGrp/ManagementAndGeneralAmt | 2 | 3000 |
| IRS990/OtherExpensesGrp/ProgramServicesAmt | 0 | 569269 |
| IRS990/OtherExpensesGrp/ProgramServicesAmt | 1 | 521617 |
| IRS990/OtherExpensesGrp/ProgramServicesAmt | 2 | 423751 |
| IRS990/OtherExpensesGrp/ProgramServicesAmt | 3 | 320074 |
| IRS990/OtherExpensesGrp/TotalAmt | 0 | 569294 |
| IRS990/OtherExpensesGrp/TotalAmt | 1 | 525117 |
| IRS990/OtherExpensesGrp/TotalAmt | 2 | 423751 |
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