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| IRS990/ActivityOrMissionDesc | 0 | To preserve and protect the Hudson River, its tributaries, and related bodies of water. As an organization, Clearwater works to provide innovative environmental education programs, advocacy, and celebrations designed to expand peoples experience, awareness, and stewardship of this magnificent natural resource. |
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| IRS990/Desc | 0 | sloop & education - activities: the sloop clearwater, "america's environmental flagship" for more than 54 years, serves as a floating classoom for children and adults, offering experiential and practical lessons about the history, science, ecology and social issues involved in the cleanup and preservation of the hudson river, as wel as programs in environmental leadership. in addition, the physical vessel itself serves as a teaching tool in the maritime arts. volunteers: volunteers help staff the sloop and teach at learning stations during sailing season. |
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| IRS990/Form990PartVIISectionAGrp/TitleTxt | 12 | BOARD MEMBER |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 13 | BOARD MEMBER |
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| IRS990/Form990PartVIISectionAGrp/TitleTxt | 15 | BOARD MEMBER |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 16 | BOARD MEMBER |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 17 | BOARD MEMBER |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 18 | BOARD MEMBER |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 19 | board member |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 20 | board member |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 21 | board member |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 22 | board member |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 23 | BOARD MEMBER |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 24 | AT LARGE MEMBER |
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| IRS990/IndependentVotingMemberCnt | 0 | 22 |
| IRS990/IndivRcvdGreaterThan100KCnt | 0 | 0 |
| IRS990/IndoorTanningServicesInd | 0 | false |
| IRS990/InfoInScheduleOPartVIInd | 0 | X |
| IRS990/InfoInScheduleOPartXIInd | 0 | X |
| IRS990/InformationTechnologyGrp/TotalAmt | 0 | 0 |
| IRS990/InsuranceGrp/ManagementAndGeneralAmt | 0 | 25150 |
| IRS990/InsuranceGrp/ProgramServicesAmt | 0 | 59392 |
| IRS990/InsuranceGrp/TotalAmt | 0 | 84542 |
| IRS990/IntangibleAssetsGrp/EOYAmt | 0 | 0 |
| IRS990/InterestGrp/ManagementAndGeneralAmt | 0 | 12199 |
| IRS990/InterestGrp/TotalAmt | 0 | 12199 |
| IRS990/InventoriesForSaleOrUseGrp/BOYAmt | 0 | 9640 |
| IRS990/InventoriesForSaleOrUseGrp/EOYAmt | 0 | 9640 |
| IRS990/InvestmentIncomeGrp/ExclusionAmt | 0 | 12 |
| IRS990/InvestmentIncomeGrp/TotalRevenueColumnAmt | 0 | 12 |
| IRS990/InvestmentInJointVentureInd | 0 | false |
| IRS990/InvestmentsOtherSecuritiesGrp/EOYAmt | 0 | 0 |
| IRS990/InvestmentsProgramRelatedGrp/EOYAmt | 0 | 0 |
| IRS990/InvestmentsPubTradedSecGrp/EOYAmt | 0 | 0 |
| IRS990/IRPDocumentCnt | 0 | 4 |
| IRS990/IRPDocumentW2GCnt | 0 | 0 |
| IRS990/LandBldgEquipAccumDeprecAmt | 0 | 2248793 |
| IRS990/LandBldgEquipBasisNetGrp/BOYAmt | 0 | 1585394 |
| IRS990/LandBldgEquipBasisNetGrp/EOYAmt | 0 | 1438327 |
| IRS990/LandBldgEquipCostOrOtherBssAmt | 0 | 3687120 |
| IRS990/LegalDomicileStateCd | 0 | NY |
| IRS990/LoanOutstandingInd | 0 | true |
| IRS990/LoansFromOfficersDirectorsGrp/BOYAmt | 0 | 26700 |
| IRS990/LoansFromOfficersDirectorsGrp/EOYAmt | 0 | 25100 |
| IRS990/LobbyingActivitiesInd | 0 | false |
| IRS990/LocalChaptersInd | 0 | false |
| IRS990/MaterialDiversionOrMisuseInd | 0 | false |
| IRS990/MembersOrStockholdersInd | 0 | true |
| IRS990/MethodOfAccountingAccrualInd | 0 | X |
| IRS990/MinutesOfCommitteesInd | 0 | true |
| IRS990/MinutesOfGoverningBodyInd | 0 | true |
| IRS990/MissionDesc | 0 | To preserve and protect the Hudson River, its tributaries, and related bodies of water. As an organization, Clearwater works to provide innovative environmental education programs, advocacy, and celebrations designed to expand peoples experience, awareness, and stewardship of this magnificent natural resource. |
| IRS990/MoreThan5000KToIndividualsInd | 0 | false |
| IRS990/MoreThan5000KToOrgInd | 0 | false |
| IRS990/MortgNotesPyblScrdInvstPropGrp/BOYAmt | 0 | 437466 |
| IRS990/MortgNotesPyblScrdInvstPropGrp/EOYAmt | 0 | 391866 |
| IRS990/NetAssetsOrFundBalancesBOYAmt | 0 | 1430914 |
| IRS990/NetAssetsOrFundBalancesEOYAmt | 0 | 925233 |
| IRS990/NetGainOrLossInvestmentsGrp/TotalRevenueColumnAmt | 0 | 0 |
| IRS990/NetIncmFromFundraisingEvtGrp/TotalRevenueColumnAmt | 0 | 0 |
| IRS990/NetIncomeFromGamingGrp/TotalRevenueColumnAmt | 0 | 0 |
| IRS990/NetIncomeOrLossGrp/ExclusionAmt | 0 | 3262 |
| IRS990/NetIncomeOrLossGrp/TotalRevenueColumnAmt | 0 | 3262 |
| IRS990/NetRentalIncomeOrLossGrp/TotalRevenueColumnAmt | 0 | 0 |
| IRS990/NoDonorRestrictionNetAssetsGrp/BOYAmt | 0 | 1430914 |
| IRS990/NoDonorRestrictionNetAssetsGrp/EOYAmt | 0 | 925233 |
| IRS990/NoListedPersonsCompensatedInd | 0 | X |
| IRS990/NondeductibleContributionsInd | 0 | false |
| IRS990/OccupancyGrp/ManagementAndGeneralAmt | 0 | 11200 |
| IRS990/OccupancyGrp/TotalAmt | 0 | 11200 |
| IRS990/OfficeExpensesGrp/FundraisingAmt | 0 | 41567 |
| IRS990/OfficeExpensesGrp/ManagementAndGeneralAmt | 0 | 10567 |
| IRS990/OfficeExpensesGrp/ProgramServicesAmt | 0 | 196 |
| IRS990/OfficeExpensesGrp/TotalAmt | 0 | 52330 |
| IRS990/OfficerMailingAddressInd | 0 | false |
| IRS990/OperateHospitalInd | 0 | false |
| IRS990/Organization501c3Ind | 0 | X |
| IRS990/OrganizationFollowsFASB117Ind | 0 | X |
| IRS990/OtherAssetsTotalGrp/EOYAmt | 0 | 0 |
| IRS990/OtherChangesInNetAssetsAmt | 0 | -3261 |
| IRS990/OtherEmployeeBenefitsGrp/FundraisingAmt | 0 | 1031 |
| IRS990/OtherEmployeeBenefitsGrp/ManagementAndGeneralAmt | 0 | 35806 |
| IRS990/OtherEmployeeBenefitsGrp/ProgramServicesAmt | 0 | 18556 |
| IRS990/OtherEmployeeBenefitsGrp/TotalAmt | 0 | 55393 |
| IRS990/OtherExpensesGrp/Desc | 0 | equipment rental & maint. |
| IRS990/OtherExpensesGrp/Desc | 1 | program rentals |
| IRS990/OtherExpensesGrp/Desc | 2 | FOOD |
| IRS990/OtherExpensesGrp/Desc | 3 | Credit Card Fees & Bank Charge |
| IRS990/OtherExpensesGrp/FundraisingAmt | 0 | 909 |
| IRS990/OtherExpensesGrp/FundraisingAmt | 1 | 223 |
| IRS990/OtherExpensesGrp/ManagementAndGeneralAmt | 0 | 4195 |
| IRS990/OtherExpensesGrp/ManagementAndGeneralAmt | 1 | 160 |
| IRS990/OtherExpensesGrp/ManagementAndGeneralAmt | 2 | 8289 |
| IRS990/OtherExpensesGrp/ProgramServicesAmt | 0 | 95908 |