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        <FilingOrganizationsTotalAmt>10000</FilingOrganizationsTotalAmt>
      </TotalDirectLobbyingGrp>
      <TotalLobbyingExpendGrp>
        <FilingOrganizationsTotalAmt>20000</FilingOrganizationsTotalAmt>
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      <OtherExemptPurposeExpendGrp>
        <FilingOrganizationsTotalAmt>3804691</FilingOrganizationsTotalAmt>
      </OtherExemptPurposeExpendGrp>
      <TotalExemptPurposeExpendGrp>
        <FilingOrganizationsTotalAmt>3824691</FilingOrganizationsTotalAmt>
      </TotalExemptPurposeExpendGrp>
      <LobbyingNontaxableAmountGrp>
        <FilingOrganizationsTotalAmt>341235</FilingOrganizationsTotalAmt>
      </LobbyingNontaxableAmountGrp>
      <GrassrootsNontaxableGrp>
        <FilingOrganizationsTotalAmt>85309</FilingOrganizationsTotalAmt>
      </GrassrootsNontaxableGrp>
      <Form4720FiledInd>false</Form4720FiledInd>
      <AvgLobbyingNontaxableAmountGrp>
        <CurrentYearMinus3Amt>306787</CurrentYearMinus3Amt>
        <CurrentYearMinus2Amt>358132</CurrentYearMinus2Amt>
        <CurrentYearMinus1Amt>322620</CurrentYearMinus1Amt>
        <CurrentYearAmt>341235</CurrentYearAmt>
        <TotalAmt>1328774</TotalAmt>
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      <LobbyingCeilingAmt>1993161</LobbyingCeilingAmt>
      <AvgTotalLobbyingExpendGrp>
        <CurrentYearMinus3Amt>18000</CurrentYearMinus3Amt>
        <CurrentYearMinus2Amt>18000</CurrentYearMinus2Amt>
        <CurrentYearMinus1Amt>20000</CurrentYearMinus1Amt>
        <CurrentYearAmt>20000</CurrentYearAmt>
        <TotalAmt>76000</TotalAmt>
      </AvgTotalLobbyingExpendGrp>
      <AvgGrassrootsNontaxableGrp>
        <CurrentYearMinus3Amt>76697</CurrentYearMinus3Amt>
        <CurrentYearMinus2Amt>89533</CurrentYearMinus2Amt>
        <CurrentYearMinus1Amt>80655</CurrentYearMinus1Amt>
        <CurrentYearAmt>85309</CurrentYearAmt>
        <TotalAmt>332194</TotalAmt>
      </AvgGrassrootsNontaxableGrp>
      <GrassrootsCeilingAmt>498291</GrassrootsCeilingAmt>
      <AvgGrassrootsLobbyingExpendGrp>
        <CurrentYearMinus3Amt>2000</CurrentYearMinus3Amt>
        <CurrentYearMinus2Amt>2000</CurrentYearMinus2Amt>
        <CurrentYearMinus1Amt>10000</CurrentYearMinus1Amt>
        <CurrentYearAmt>10000</CurrentYearAmt>
        <TotalAmt>24000</TotalAmt>
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      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Part II-B, Line 1i - Other Activities Description</FormAndLineReferenceDesc>
        <ExplanationTxt>FOUR STAFF RIVERKEEPERS SPEND APPROXIMATELY 5-10% OF THEIR TIME TESTIFYING BEFORE AND MEETING WITH LEGISLATORS, SPEAKING TO LEGISLATORS AND THE PUBLIC IN SUPPORT OF LEGISLATION, AND SENDING EMAILS TO LEGISLATORS AND THE PUBLIC ON BEHALF OF LEGISLATION, ALL OF WHICH IS IN SUPPORT OF RIVER RESTORATION AND PROTECTION. THE ORGANIZATION'S NEWSLETTERS WILL ON OCCASION CONTAIN ARTICLES ADDRESSING LEGISLATION AFFECTING OUR WATERSHEDS.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Part IV - Additional Information</FormAndLineReferenceDesc>
      </SupplementalInformationDetail>
    </IRS990ScheduleC>
    <IRS990ScheduleD documentId="IRS990ScheduleD" softwareId="21013475" softwareVersionNum="2021v4.0">
      <LeaseholdImprovementsGrp>
        <OtherCostOrOtherBasisAmt>81775</OtherCostOrOtherBasisAmt>
        <DepreciationAmt>39886</DepreciationAmt>
        <BookValueAmt>41889</BookValueAmt>
      </LeaseholdImprovementsGrp>
      <EquipmentGrp>
        <OtherCostOrOtherBasisAmt>419965</OtherCostOrOtherBasisAmt>
        <DepreciationAmt>306515</DepreciationAmt>
        <BookValueAmt>113450</BookValueAmt>
      </EquipmentGrp>
      <OtherLandBuildingsGrp>
        <OtherCostOrOtherBasisAmt>-28528</OtherCostOrOtherBasisAmt>
        <DepreciationAmt>-21605</DepreciationAmt>
        <BookValueAmt>-6923</BookValueAmt>
      </OtherLandBuildingsGrp>
      <TotalBookValueLandBuildingsAmt>148416</TotalBookValueLandBuildingsAmt>
      <OtherLiabilitiesOrgGrp>
        <Desc>PAYROLL TAXES PAYABLE</Desc>
        <Amt>1135</Amt>
      </OtherLiabilitiesOrgGrp>
      <OtherLiabilitiesOrgGrp>
        <Desc>Rounding</Desc>
        <Amt>1</Amt>
      </OtherLiabilitiesOrgGrp>
      <TotalLiabilityAmt>1136</TotalLiabilityAmt>
      <TotalRevEtcAuditedFinclStmtAmt>4418969</TotalRevEtcAuditedFinclStmtAmt>
      <NetUnrealizedGainsInvstAmt>46693</NetUnrealizedGainsInvstAmt>
      <OtherRevenueAmt>31818</OtherRevenueAmt>
      <RevenueNotReportedAmt>78511</RevenueNotReportedAmt>
      <RevenueSubtotalAmt>4340458</RevenueSubtotalAmt>
      <TotalRevenuePerForm990Amt>4340458</TotalRevenuePerForm990Amt>
      <TotExpnsEtcAuditedFinclStmtAmt>4376129</TotExpnsEtcAuditedFinclStmtAmt>
      <OtherExpensesIncludedAmt>31818</OtherExpensesIncludedAmt>
      <ExpensesNotReportedAmt>31818</ExpensesNotReportedAmt>
      <ExpensesSubtotalAmt>4344311</ExpensesSubtotalAmt>
      <TotalExpensesPerForm990Amt>4344311</TotalExpensesPerForm990Amt>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Part V, Line 4: Intended uses of the endowment fund.</FormAndLineReferenceDesc>
        <ExplanationTxt>BOARD DIRECTED ENDOWMENT FOR THE RIVERKEEPER PROGRAM.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Part XI, Line 2d: Other revenue amounts included in F/S but not included on form 990</FormAndLineReferenceDesc>
        <ExplanationTxt>SPECIAL EVENT DIRECT EXPENSES $31818</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Part XII, Line 2d: Other expenses and losses per audited F/S</FormAndLineReferenceDesc>
        <ExplanationTxt>SPECIAL EVENT DIRECT EXPENSES $31818</ExplanationTxt>
      </SupplementalInformationDetail>
    </IRS990ScheduleD>
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      <SpecialFundraisingEventsInd>X</SpecialFundraisingEventsInd>
      <AgrmtProfFundraisingActyInd>false</AgrmtProfFundraisingActyInd>
      <FundraisingEventInformationGrp>
        <Event1Nm>SUMMER SOLSTICE GALA</Event1Nm>
        <GrossReceiptsEvent1Amt>92230</GrossReceiptsEvent1Amt>
        <GrossRevenueEvent1Amt>92230</GrossRevenueEvent1Amt>
        <OtherDirectExpensesEvent1Amt>6661</OtherDirectExpensesEvent1Amt>
        <Event2Nm>RIDE FOR CLEAN RIVERS</Event2Nm>
        <GrossReceiptsEvent2Amt>36766</GrossReceiptsEvent2Amt>
        <GrossRevenueEvent2Amt>36766</GrossRevenueEvent2Amt>
        <FoodAndBeverageEvent2Amt>3750</FoodAndBeverageEvent2Amt>
        <OtherDirectExpensesEvent2Amt>7707</OtherDirectExpensesEvent2Amt>
        <OtherEventsTotalCnt>2</OtherEventsTotalCnt>
        <GrossReceiptsOtherEventsAmt>35768</GrossReceiptsOtherEventsAmt>
        <GrossRevenueOtherEventsAmt>35768</GrossRevenueOtherEventsAmt>
        <RentFcltyCostsOtherEventsAmt>1148</RentFcltyCostsOtherEventsAmt>
        <OthDirectExpnssOtherEventsAmt>7619</OthDirectExpnssOtherEventsAmt>
        <GrossReceiptsTotalAmt>164764</GrossReceiptsTotalAmt>
        <GrossRevenueTotalEventsAmt>164764</GrossRevenueTotalEventsAmt>
        <RentFcltyCostsTotalEventsAmt>1148</RentFcltyCostsTotalEventsAmt>
        <FoodAndBeverageTotalEventsAmt>3750</FoodAndBeverageTotalEventsAmt>
        <OthDirectExpnssTotalEventsAmt>21987</OthDirectExpnssTotalEventsAmt>
        <DirectExpenseSummaryEventsAmt>26885</DirectExpenseSummaryEventsAmt>
        <NetIncomeSummaryAmt>137879</NetIncomeSummaryAmt>
      </FundraisingEventInformationGrp>
    </IRS990ScheduleG>
    <IRS990ScheduleM documentId="IRS990ScheduleM" softwareId="21013475" softwareVersionNum="2021v4.0">
      <SecuritiesPubliclyTradedGrp>
        <NonCashCheckboxInd>X</NonCashCheckboxInd>
        <ContributionCnt>10</ContributionCnt>
        <NoncashContributionsRptF990Amt>31981</NoncashContributionsRptF990Amt>
      </SecuritiesPubliclyTradedGrp>
      <AnyPropertyThatMustBeHeldInd>false</AnyPropertyThatMustBeHeldInd>
      <ReviewProcessUnusualNCGiftsInd>true</ReviewProcessUnusualNCGiftsInd>
      <ThirdPartiesUsedInd>false</ThirdPartiesUsedInd>
    </IRS990ScheduleM>
    <IRS990ScheduleO documentId="IRS990ScheduleO" softwareId="21013475" softwareVersionNum="2021v4.0">
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VI, Line 2: Description of Business or Family Relationship of Officers, Directors, Et</FormAndLineReferenceDesc>
        <ExplanationTxt>THE EXECUTIVE DIRECTOR IS THE DAUGHTER OF THE DIRECTOR OF OPERATIONS/FINANCE.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VI, Line 8: Explanation of No Contemporaneously Documentation of Meetings</FormAndLineReferenceDesc>
        <ExplanationTxt>MINUTES ARE RECORDED AND MAINTAINED ON FILE FOR EACH BOARD OF DIRECTORS MEETING.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VI, Line 11b: Form 990 Review Process</FormAndLineReferenceDesc>
        <ExplanationTxt>THE 990 IS PRESENTED TO THE EXECUTIVE DIRECTOR AND BOARD OF DIRECTORS FOR REVIEW PRIOR TO FILING.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VI, Line 12c: Explanation of Monitoring and Enforcement of Conflicts</FormAndLineReferenceDesc>
        <ExplanationTxt>CONFLICT OF INTEREST DISCLOSURE FORMS ARE SENT OUT ANNUALLY TO ALL BOARD MEMBERS AND KEY STAFF.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VI, Line 19: Other Organization Documents Publicly Available</FormAndLineReferenceDesc>
        <ExplanationTxt>No documents available to the public.</ExplanationTxt>
      </SupplementalInformationDetail>
    </IRS990ScheduleO>
  </ReturnData>
</Return>
