| IRS990/AccountantCompileOrReviewInd | 0 | 0 |
| IRS990/AccountsPayableAccrExpnssGrp/BOYAmt | 0 | 101578 |
| IRS990/AccountsPayableAccrExpnssGrp/EOYAmt | 0 | 136454 |
| IRS990/AccountsReceivableGrp/BOYAmt | 0 | 370141 |
| IRS990/AccountsReceivableGrp/EOYAmt | 0 | 170434 |
| IRS990/ActivitiesConductedPrtshpInd | 0 | 0 |
| 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 PEOPLE'S EXPERIENCE, AWARENESS, AND STEWARDSHIP OF THIS MAGNIFICENT NATURAL RESOURCE. |
| IRS990/AdvertisingGrp/ManagementAndGeneralAmt | 0 | 665 |
| IRS990/AdvertisingGrp/ProgramServicesAmt | 0 | 526 |
| IRS990/AdvertisingGrp/TotalAmt | 0 | 1191 |
| IRS990/AllOtherContributionsAmt | 0 | 648174 |
| IRS990/AllOtherExpensesGrp/FundraisingAmt | 0 | 1230 |
| IRS990/AllOtherExpensesGrp/ManagementAndGeneralAmt | 0 | -2079 |
| IRS990/AllOtherExpensesGrp/ProgramServicesAmt | 0 | 2760 |
| IRS990/AllOtherExpensesGrp/TotalAmt | 0 | 1911 |
| IRS990/AnnualDisclosureCoveredPrsnInd | 0 | 1 |
| IRS990/BackupWthldComplianceInd | 0 | 1 |
| IRS990/BooksInCareOfDetail/BusinessName/BusinessNameLine1Txt | 0 | DAVID TOMAN |
| IRS990/BooksInCareOfDetail/PhoneNum | 0 | 8452658080 |
| IRS990/BooksInCareOfDetail/USAddress/AddressLine1Txt | 0 | 724 WOLCOTT AVENUE |
| IRS990/BooksInCareOfDetail/USAddress/CityNm | 0 | BEACON |
| IRS990/BooksInCareOfDetail/USAddress/StateAbbreviationCd | 0 | NY |
| IRS990/BooksInCareOfDetail/USAddress/ZIPCd | 0 | 12508 |
| IRS990/BusinessRlnWith35CtrlEntInd | 0 | 0 |
| IRS990/BusinessRlnWithFamMemInd | 0 | 0 |
| IRS990/BusinessRlnWithOrgMemInd | 0 | 0 |
| IRS990/CashNonInterestBearingGrp/BOYAmt | 0 | 21119 |
| IRS990/CashNonInterestBearingGrp/EOYAmt | 0 | 5061 |
| IRS990/ChangeToOrgDocumentsInd | 0 | 0 |
| IRS990/CntrctRcvdGreaterThan100KCnt | 0 | 0 |
| IRS990/CollectionsOfArtInd | 0 | 0 |
| IRS990/CompCurrentOfcrDirectorsGrp/ManagementAndGeneralAmt | 0 | 45027 |
| IRS990/CompCurrentOfcrDirectorsGrp/ProgramServicesAmt | 0 | 67542 |
| IRS990/CompCurrentOfcrDirectorsGrp/TotalAmt | 0 | 112569 |
| 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/CostOfGoodsSoldAmt | 0 | 2620 |
| IRS990/CreditCounselingInd | 0 | 0 |
| IRS990/CYBenefitsPaidToMembersAmt | 0 | 0 |
| IRS990/CYContributionsGrantsAmt | 0 | 648174 |
| IRS990/CYGrantsAndSimilarPaidAmt | 0 | 0 |
| IRS990/CYInvestmentIncomeAmt | 0 | 9662 |
| IRS990/CYOtherExpensesAmt | 0 | 566502 |
| IRS990/CYOtherRevenueAmt | 0 | 96859 |
| IRS990/CYProgramServiceRevenueAmt | 0 | 370844 |
| IRS990/CYRevenuesLessExpensesAmt | 0 | -436006 |
| IRS990/CYSalariesCompEmpBnftPaidAmt | 0 | 995043 |
| IRS990/CYTotalExpensesAmt | 0 | 1561545 |
| IRS990/CYTotalFundraisingExpenseAmt | 0 | 205335 |
| IRS990/CYTotalProfFndrsngExpnsAmt | 0 | 0 |
| IRS990/CYTotalRevenueAmt | 0 | 1125539 |
| IRS990/DecisionsSubjectToApprovaInd | 0 | 1 |
| IRS990/DeductibleArtContributionInd | 0 | 0 |
| IRS990/DeductibleNonCashContriInd | 0 | 0 |
| IRS990/DelegationOfMgmtDutiesInd | 0 | 0 |
| IRS990/DepreciationDepletionGrp/ProgramServicesAmt | 0 | 156145 |
| IRS990/DepreciationDepletionGrp/TotalAmt | 0 | 156145 |
| IRS990/Desc | 0 | EDUCATION & SLOOP - ACTIVITIES: THE SLOOP CLEARWATER, "AMERICA'S ENVIRONMENTAL FLAGSHIP" FOR MORE THAN 54 YEARS, SERVES AS A FLOATING CLASSROOM 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 WELL AS PROGRAMS IN ENVIRONMENTAL LEADERSHIP. IN ADDITION, THE PHYSICAL VESSEL ITSELF SERVES AS A TEACHING TOOL IN THE MARTIME ARTS. VOLUNTEERS: VOLUNTEERS HELP STAFF THE SLOOP AND TEACH AT LEARNING STATIONS DURING SAILING SEASON. |
| IRS990/DescribedInSection501c3Ind | 0 | 1 |
| IRS990/DisregardedEntityInd | 0 | 0 |
| IRS990/DocumentRetentionPolicyInd | 0 | 1 |
| IRS990/DonorAdvisedFundInd | 0 | 0 |
| IRS990/DonorRstrOrQuasiEndowmentsInd | 0 | 0 |
| IRS990/ElectionOfBoardMembersInd | 0 | 1 |
| IRS990/EmployeeCnt | 0 | 64 |
| IRS990/EmploymentTaxReturnsFiledInd | 0 | 1 |
| IRS990/EngagedInExcessBenefitTransInd | 0 | 0 |
| IRS990/ExpenseAmt | 0 | 774405 |
| IRS990/FamilyOrBusinessRlnInd | 0 | 0 |
| IRS990/FederalGrantAuditRequiredInd | 0 | 0 |
| IRS990/FeesForServicesAccountingGrp/ManagementAndGeneralAmt | 0 | 41200 |
| IRS990/FeesForServicesAccountingGrp/TotalAmt | 0 | 41200 |
| IRS990/FeesForServicesOtherGrp/FundraisingAmt | 0 | 1772 |
| IRS990/FeesForServicesOtherGrp/ManagementAndGeneralAmt | 0 | 38965 |
| IRS990/FeesForServicesOtherGrp/ProgramServicesAmt | 0 | 26459 |
| IRS990/FeesForServicesOtherGrp/TotalAmt | 0 | 67196 |
| 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 | 5.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 2 | 5.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 3 | 5.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 4 | 2.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 5 | 2.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 6 | 2.00 |
| 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 | 1.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 24 | 1.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 25 | 40.00 |
| IRS990/Form990PartVIISectionAGrp/IndividualTrusteeOrDirectorInd | 0 | X |
| IRS990/Form990PartVIISectionAGrp/IndividualTrusteeOrDirectorInd | 1 | X |
| IRS990/Form990PartVIISectionAGrp/IndividualTrusteeOrDirectorInd | 2 | X |
| IRS990/Form990PartVIISectionAGrp/IndividualTrusteeOrDirectorInd | 3 | X |
| IRS990/Form990PartVIISectionAGrp/IndividualTrusteeOrDirectorInd | 4 | X |
| IRS990/Form990PartVIISectionAGrp/IndividualTrusteeOrDirectorInd | 5 | X |
| IRS990/Form990PartVIISectionAGrp/IndividualTrusteeOrDirectorInd | 6 | X |
| IRS990/Form990PartVIISectionAGrp/IndividualTrusteeOrDirectorInd | 7 | X |
| IRS990/Form990PartVIISectionAGrp/IndividualTrusteeOrDirectorInd | 8 | X |
| IRS990/Form990PartVIISectionAGrp/IndividualTrusteeOrDirectorInd | 9 | X |
| IRS990/Form990PartVIISectionAGrp/IndividualTrusteeOrDirectorInd | 10 | X |
| IRS990/Form990PartVIISectionAGrp/IndividualTrusteeOrDirectorInd | 11 | X |
| IRS990/Form990PartVIISectionAGrp/IndividualTrusteeOrDirectorInd | 12 | X |
| IRS990/Form990PartVIISectionAGrp/IndividualTrusteeOrDirectorInd | 13 | X |
| IRS990/Form990PartVIISectionAGrp/IndividualTrusteeOrDirectorInd | 14 | X |
| 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/IndividualTrusteeOrDirectorInd | 23 | X |
| IRS990/Form990PartVIISectionAGrp/IndividualTrusteeOrDirectorInd | 24 | 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 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 4 | 0 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 5 | 0 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 6 | 0 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 7 | 0 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 8 | 0 |
| 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 | 0 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 24 | 0 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 25 | 13608 |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 0 | SAMANTHA HICKS |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 1 | ARTHUR JONES |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 2 | ROSEMARY THOMAS |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 3 | NEIL GORDON |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 4 | STEVE STANNE |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 5 | MITZI ELKES |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 6 | HENRY NEALE |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 7 | SARAH ARMOUR |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 8 | ADENIKE BAMGBOYE |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 9 | PETER CAPEK |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 10 | JOAN GAYLORD |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 11 | SCOTT GREATHEAD |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 12 | ALLEN GUTKIN |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 13 | GARETH HOUGHAM |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 14 | STEVE KEILAR |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 15 | AARON MAIR |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 16 | JENNIFER MCMILLAN |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 17 | TOM MURPHY |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 18 | JEREMY RAINER |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 19 | DANIEL REISEL |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 20 | LARRY ROTHBART |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 21 | DONNA STEIN |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 22 | SARAH UNDERHILL |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 23 | GREG WILLIAMS |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 24 | THOMASINA WINSLOW |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 25 | DAVID TOMAN |
| 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 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 24 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 25 | 84000 |
| 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/TitleTxt | 0 | PRESIDENT |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 1 | VICE PRESIDENT |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 2 | SECRETARY |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 3 | TREASURER |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 4 | AT-LARGE MEMBER |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 5 | AT-LARGE MEMBER |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 6 | AT-LARGE MEMBER |
| 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 |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 21 | DIRECTOR |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 22 | DIRECTOR |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 23 | DIRECTOR |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 24 | DIRECTOR |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 25 | EXECUTIVE DIRECTOR |
| IRS990/Form990ProvidedToGvrnBodyInd | 0 | 1 |
| IRS990/FormationYr | 0 | 1966 |
| IRS990/FormerOfcrEmployeesListedInd | 0 | 0 |
| IRS990/FSAuditedInd | 0 | 0 |
| IRS990/FundraisingActivitiesInd | 0 | 1 |
| IRS990/FundraisingDirectExpensesAmt | 0 | 20674 |
| IRS990/FundraisingGrossIncomeAmt | 0 | 112047 |
| IRS990/GamingActivitiesInd | 0 | 0 |
| IRS990/GoverningBodyVotingMembersCnt | 0 | 24 |
| IRS990/GrantsToIndividualsInd | 0 | 0 |
| IRS990/GrantsToOrganizationsInd | 0 | 0 |
| IRS990/GrantToRelatedPersonInd | 0 | 0 |
| IRS990/GrossReceiptsAmt | 0 | 1148833 |
| IRS990/GrossSalesOfInventoryAmt | 0 | 8106 |
| IRS990/GroupReturnForAffiliatesInd | 0 | 0 |
| IRS990/IncludeFIN48FootnoteInd | 0 | 0 |
| IRS990/IndependentAuditFinclStmtInd | 0 | 0 |
| IRS990/IndependentVotingMemberCnt | 0 | 24 |
| IRS990/IndivRcvdGreaterThan100KCnt | 0 | 0 |
| IRS990/IndoorTanningServicesInd | 0 | 0 |
| IRS990/InfoInScheduleOPartIIIInd | 0 | X |
| IRS990/InfoInScheduleOPartVIInd | 0 | X |
| IRS990/InsuranceGrp/ManagementAndGeneralAmt | 0 | 24510 |
| IRS990/InsuranceGrp/ProgramServicesAmt | 0 | 49768 |
| IRS990/InsuranceGrp/TotalAmt | 0 | 74278 |
| IRS990/InterestGrp/ManagementAndGeneralAmt | 0 | 17315 |
| IRS990/InterestGrp/TotalAmt | 0 | 17315 |
| IRS990/InventoriesForSaleOrUseGrp/BOYAmt | 0 | 12413 |
| IRS990/InventoriesForSaleOrUseGrp/EOYAmt | 0 | 12413 |
| IRS990/InvestmentIncomeGrp/ExclusionAmt | 0 | 9662 |
| IRS990/InvestmentIncomeGrp/TotalRevenueColumnAmt | 0 | 9662 |
| IRS990/InvestmentInJointVentureInd | 0 | 0 |
| IRS990/IRPDocumentCnt | 0 | 10 |
| IRS990/IRPDocumentW2GCnt | 0 | 0 |
| IRS990/LandBldgEquipAccumDeprecAmt | 0 | 2408834 |
| IRS990/LandBldgEquipBasisNetGrp/BOYAmt | 0 | 1609740 |
| IRS990/LandBldgEquipBasisNetGrp/EOYAmt | 0 | 1308195 |
| IRS990/LandBldgEquipCostOrOtherBssAmt | 0 | 3717029 |
| IRS990/LegalDomicileStateCd | 0 | NY |
| IRS990/LoanOutstandingInd | 0 | 1 |
| IRS990/LoansFromOfficersDirectorsGrp/BOYAmt | 0 | 25100 |
| IRS990/LoansFromOfficersDirectorsGrp/EOYAmt | 0 | 106630 |
| IRS990/LobbyingActivitiesInd | 0 | 0 |
| IRS990/LocalChaptersInd | 0 | 0 |
| IRS990/MaterialDiversionOrMisuseInd | 0 | 0 |
| IRS990/MembersOrStockholdersInd | 0 | 1 |
| IRS990/MethodOfAccountingAccrualInd | 0 | X |
| IRS990/MinutesOfCommitteesInd | 0 | 1 |
| IRS990/MinutesOfGoverningBodyInd | 0 | 1 |
| 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 PEOPLE'S EXPERIENCE, AWARENESS, AND STEWARDSHIP OF THIS MAGNIFICENT NATURAL RESOURCE. |
| IRS990/MoreThan5000KToIndividualsInd | 0 | 0 |
| IRS990/MoreThan5000KToOrgInd | 0 | 0 |
| IRS990/MortgNotesPyblScrdInvstPropGrp/BOYAmt | 0 | 391866 |
| IRS990/MortgNotesPyblScrdInvstPropGrp/EOYAmt | 0 | 345825 |
| IRS990/NetAssetsOrFundBalancesBOYAmt | 0 | 1494869 |
| IRS990/NetAssetsOrFundBalancesEOYAmt | 0 | 907194 |
| IRS990/NetIncmFromFundraisingEvtGrp/ExclusionAmt | 0 | 91373 |
| IRS990/NetIncmFromFundraisingEvtGrp/TotalRevenueColumnAmt | 0 | 91373 |
| IRS990/NetIncomeOrLossGrp/ExclusionAmt | 0 | 5486 |
| IRS990/NetIncomeOrLossGrp/TotalRevenueColumnAmt | 0 | 5486 |
| IRS990/NetUnrelatedBusTxblIncmAmt | 0 | 0 |
| IRS990/NoDonorRestrictionNetAssetsGrp/BOYAmt | 0 | 1494869 |
| IRS990/NoDonorRestrictionNetAssetsGrp/EOYAmt | 0 | 907194 |
| IRS990/NondeductibleContributionsInd | 0 | 0 |
| IRS990/OccupancyGrp/ManagementAndGeneralAmt | 0 | 20841 |
| IRS990/OccupancyGrp/ProgramServicesAmt | 0 | 28220 |
| IRS990/OccupancyGrp/TotalAmt | 0 | 49061 |
| IRS990/OfficeExpensesGrp/FundraisingAmt | 0 | 28608 |
| IRS990/OfficeExpensesGrp/ManagementAndGeneralAmt | 0 | 15185 |
| IRS990/OfficeExpensesGrp/ProgramServicesAmt | 0 | 4127 |
| IRS990/OfficeExpensesGrp/TotalAmt | 0 | 47920 |
| IRS990/OfficerMailingAddressInd | 0 | 0 |
| IRS990/OperateHospitalInd | 0 | 0 |
| IRS990/Organization501c3Ind | 0 | X |
| IRS990/OrganizationFollowsFASB117Ind | 0 | X |
| IRS990/OtherChangesInNetAssetsAmt | 0 | 0 |
| IRS990/OtherEmployeeBenefitsGrp/FundraisingAmt | 0 | 13113 |
| IRS990/OtherEmployeeBenefitsGrp/ManagementAndGeneralAmt | 0 | 58869 |
| IRS990/OtherEmployeeBenefitsGrp/ProgramServicesAmt | 0 | 44742 |
| IRS990/OtherEmployeeBenefitsGrp/TotalAmt | 0 | 116724 |
| IRS990/OtherExpensesGrp/Desc | 0 | EQUIPMENT RENTAL & MAIN |
| IRS990/OtherExpensesGrp/Desc | 1 | FOOD |
| IRS990/OtherExpensesGrp/Desc | 2 | OPERATING SUPPLIES |
| IRS990/OtherExpensesGrp/Desc | 3 | DUES/MEMBERSHIPS |
| IRS990/OtherExpensesGrp/FundraisingAmt | 0 | 2410 |
| IRS990/OtherExpensesGrp/FundraisingAmt | 1 | 628 |
| IRS990/OtherExpensesGrp/ManagementAndGeneralAmt | 0 | 173 |
| IRS990/OtherExpensesGrp/ManagementAndGeneralAmt | 1 | 651 |
| IRS990/OtherExpensesGrp/ManagementAndGeneralAmt | 2 | 256 |
| IRS990/OtherExpensesGrp/ManagementAndGeneralAmt | 3 | 2681 |
| IRS990/OtherExpensesGrp/ProgramServicesAmt | 0 | 56912 |
| IRS990/OtherExpensesGrp/ProgramServicesAmt | 1 | 25081 |
| IRS990/OtherExpensesGrp/ProgramServicesAmt | 2 | 9222 |
| IRS990/OtherExpensesGrp/ProgramServicesAmt | 3 | 1141 |
| IRS990/OtherExpensesGrp/TotalAmt | 0 | 57085 |
| IRS990/OtherExpensesGrp/TotalAmt | 1 | 25732 |
| IRS990/OtherExpensesGrp/TotalAmt | 2 | 11888 |
| IRS990/OtherExpensesGrp/TotalAmt | 3 | 4450 |
| IRS990/OtherSalariesAndWagesGrp/FundraisingAmt | 0 | 157032 |
| IRS990/OtherSalariesAndWagesGrp/ManagementAndGeneralAmt | 0 | 169319 |
| IRS990/OtherSalariesAndWagesGrp/ProgramServicesAmt | 0 | 439399 |
| IRS990/OtherSalariesAndWagesGrp/TotalAmt | 0 | 765750 |
| IRS990/PartialLiquidationInd | 0 | 0 |
| IRS990/PayPremiumsPrsnlBnftCntrctInd | 0 | 0 |
| IRS990/PoliticalCampaignActyInd | 0 | 0 |
| IRS990/PrincipalOfficerNm | 0 | SAMANTHA HICKS |
| IRS990/PriorPeriodAdjustmentsAmt | 0 | -151669 |
| IRS990/ProfessionalFundraisingInd | 0 | 0 |
| IRS990/ProgramServiceRevenueGrp/BusinessCd | 0 | 900099 |
| IRS990/ProgramServiceRevenueGrp/BusinessCd | 1 | 900099 |
| IRS990/ProgramServiceRevenueGrp/Desc | 0 | SLOOP & EDUCATION PROG |
| IRS990/ProgramServiceRevenueGrp/Desc | 1 | COMMUNITY PROGRAM |
| IRS990/ProgramServiceRevenueGrp/RelatedOrExemptFuncIncomeAmt | 0 | 229798 |
| IRS990/ProgramServiceRevenueGrp/RelatedOrExemptFuncIncomeAmt | 1 | 141046 |
| IRS990/ProgramServiceRevenueGrp/TotalRevenueColumnAmt | 0 | 229798 |
| IRS990/ProgramServiceRevenueGrp/TotalRevenueColumnAmt | 1 | 141046 |
| IRS990/ProgSrvcAccomActy2Grp/Desc | 0 | ENVIRONMENTAL ACTION - ACTIVITIES: THE ORGANIZATION ACTIVATES INDIVIDUALS OF ALL AGES TO BECOME STEWARDS OF THE ENVIRONMENT AND TO LEAD WITHIN THEIR OWN COMMUNITIES THROUGH DIRECT RESEARCH AND CITIZEN INVOLVEMENT IN WATER QUALITY AND ENVIRONMENTAL CONCERNS. |
| IRS990/ProgSrvcAccomActy2Grp/ExpenseAmt | 0 | 129488 |
| IRS990/ProgSrvcAccomActy2Grp/RevenueAmt | 0 | 141046 |
| IRS990/ProgSrvcAccomActy3Grp/Desc | 0 | COMMUNITY OUTREACH - THE ORGANIZATION INSPIRES INDIVIDUALS AND COMMUNITIES TO HELP PRESERVE AND PROTECT THE HUDSON RIVER THROUGH COMMUNITY EVENTS AND MUSIC. VOLUNTEERS ARE ALSO ENGAGED TO HELP MANAGE AND RUN THE EVENTS AND TO HELP EDUCATE THE GENERAL PUBLIC. |
| IRS990/ProgSrvcAccomActy3Grp/ExpenseAmt | 0 | 18716 |
| IRS990/ProgSrvcAccomActyOtherGrp/Desc | 0 | EDUCATION PROGRAMS - "SAILING CLASSROOM AND ENVIRONMENTAL EDUCATION PROGRAMS SERVING CHILDRENADULT PUBLIC AWARENESS - DISTRIBUTION OF RELEVANT RIVER WATER QUALITY INFORMATION |
| IRS990/ProhibitedTaxShelterTransInd | 0 | 0 |
| IRS990/PYBenefitsPaidToMembersAmt | 0 | 0 |
| IRS990/PYContributionsGrantsAmt | 0 | 775776 |
| IRS990/PYExcessBenefitTransInd | 0 | 0 |
| IRS990/PYGrantsAndSimilarPaidAmt | 0 | 0 |
| IRS990/PYInvestmentIncomeAmt | 0 | 910 |
| IRS990/PYOtherExpensesAmt | 0 | 470777 |
| IRS990/PYOtherRevenueAmt | 0 | 103976 |