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      <OrganizationFollowsFASB117Ind>X</OrganizationFollowsFASB117Ind>
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        <EOYAmt>11475460</EOYAmt>
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      <DonorRestrictionNetAssetsGrp>
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      <ReconcilationRevenueExpnssAmt>148040</ReconcilationRevenueExpnssAmt>
      <NetUnrlzdGainsLossesInvstAmt>10443</NetUnrlzdGainsLossesInvstAmt>
      <MethodOfAccountingAccrualInd>X</MethodOfAccountingAccrualInd>
      <AccountantCompileOrReviewInd>true</AccountantCompileOrReviewInd>
      <AcctCompileOrReviewBasisGrp>
        <SeparateBasisFinclStmtInd>X</SeparateBasisFinclStmtInd>
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      <FSAuditedInd>false</FSAuditedInd>
      <AuditCommitteeInd>true</AuditCommitteeInd>
      <FederalGrantAuditRequiredInd>false</FederalGrantAuditRequiredInd>
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        <CurrentTaxYearMinus3YearsAmt>503011</CurrentTaxYearMinus3YearsAmt>
        <CurrentTaxYearMinus2YearsAmt>143872</CurrentTaxYearMinus2YearsAmt>
        <CurrentTaxYearMinus1YearAmt>215103</CurrentTaxYearMinus1YearAmt>
        <CurrentTaxYearAmt>269297</CurrentTaxYearAmt>
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        <CurrentTaxYearAmt>269297</CurrentTaxYearAmt>
        <TotalAmt>1537344</TotalAmt>
      </TotalCalendarYear170Grp>
      <SubstantialContributorsTotAmt>93457</SubstantialContributorsTotAmt>
      <PublicSupportTotal170Amt>1443887</PublicSupportTotal170Amt>
      <GrossInvestmentIncome170Grp>
        <CurrentTaxYearMinus4YearsAmt>980</CurrentTaxYearMinus4YearsAmt>
        <CurrentTaxYearMinus3YearsAmt>2137</CurrentTaxYearMinus3YearsAmt>
        <CurrentTaxYearMinus2YearsAmt>66049</CurrentTaxYearMinus2YearsAmt>
        <CurrentTaxYearMinus1YearAmt>54543</CurrentTaxYearMinus1YearAmt>
        <CurrentTaxYearAmt>36276</CurrentTaxYearAmt>
        <TotalAmt>159985</TotalAmt>
      </GrossInvestmentIncome170Grp>
      <TotalSupportAmt>1697329</TotalSupportAmt>
      <PublicSupportCY170Pct>0.85070</PublicSupportCY170Pct>
      <PublicSupportPY170Pct>0.84200</PublicSupportPY170Pct>
      <ThirtyThrPctSuprtTestsCY170Ind>X</ThirtyThrPctSuprtTestsCY170Ind>
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    <IRS990ScheduleB documentId="990B" softwareId="24019898" softwareVersionNum="24.0.1.0">
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      <ProtectionNaturalHabitatInd>X</ProtectionNaturalHabitatInd>
      <PreservationOpenSpaceInd>X</PreservationOpenSpaceInd>
      <TotalEasementsCnt>19</TotalEasementsCnt>
      <TotalAcreageCnt>66.64</TotalAcreageCnt>
      <StatesEasementsHeldCnt>1</StatesEasementsHeldCnt>
      <WrittenPolicyMonitoringInd>true</WrittenPolicyMonitoringInd>
      <StaffHoursSpentEnforcementCnt>180.00</StaffHoursSpentEnforcementCnt>
      <InclEscrowCustodialAcctLiabInd>false</InclEscrowCustodialAcctLiabInd>
      <LandGrp>
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        <BookValueAmt>9189254</BookValueAmt>
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      <EquipmentGrp>
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        <DepreciationAmt>9918</DepreciationAmt>
        <BookValueAmt>57317</BookValueAmt>
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      <TotalBookValueLandBuildingsAmt>9246571</TotalBookValueLandBuildingsAmt>
      <OtherSecuritiesGrp>
        <Desc>Financial derivatives and other financial products</Desc>
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      <OtherSecuritiesGrp>
        <Desc>Closely-held equity interests</Desc>
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      <OtherLiabilitiesOrgGrp>
        <Desc>Federal income taxes</Desc>
      </OtherLiabilitiesOrgGrp>
      <FootnoteTextInd>X</FootnoteTextInd>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>II 5</FormAndLineReferenceDesc>
        <ExplanationTxt>The Organizations conservation monitoring policy requires annual monitoring of each conservation easement by the executive director or a member of the board of directors. A written property inspection report, including photographs of the property is prepared to document the monitoring visit.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>II 9</FormAndLineReferenceDesc>
        <ExplanationTxt>The Organization records conservation land and land rights at cost when purchased or at fair value when donated. Fair value is generally determined by independent appraisal.Land rights are intangible assets comprised of listed rights, easements and / or restrictions over properties that are conveyed by property owners to the Organization, almost always in perpetuity, in order to protect the properties as significant natural areas. In some cases, these intangible assets may be sold or transferred to others however, they are always subject to the original restrictions and purposes as intended by the original donors/ sellers.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>X 2</FormAndLineReferenceDesc>
        <ExplanationTxt>The Organization accounts for uncertainty in income taxes in accordance with ASC Topic Income Taxes. This standard clarifies the accounting for uncertainty in tax positions and describes a recognition threshold and measurement attribute for the financial statements regarding a tax position taken or expected to be taken in a tax return. The Organization has determined that there are no uncertain tax positions which qualify for either recognition or disclosure in the financial statements as of June 30, 2024 and 2023.</ExplanationTxt>
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        <FormAndLineReferenceDesc>Form 990, Part I, Line 13</FormAndLineReferenceDesc>
        <ExplanationTxt>The Conservancys mission is to preserve, protect and maintain open space, wildlife habitats and natural resources on Block Island. The Conservancy focuses on land acquisition and stewardship, as well as educating local residents, future generations and the public about the importance of conservation and responsible use of local resources.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VI, Section A, Line 6</FormAndLineReferenceDesc>
        <ExplanationTxt>Anyone that offers a contribution of any amount to the Organization becomes a Member of the Organization. Regular Members consist of persons 18 years of age or over and may attand all meetings and have the right to vote on all matters submitted to a vote of the members Charter Members may attend all meetings but have no voting rights Honorary Members, elected by the Board of Directors, may attend all meetings and have all the rights and privileges of Regular Members. Junior Members consist of persons under 18 years of age and may attend all meetings, without voting privileges.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VI, Section A, Line 7a</FormAndLineReferenceDesc>
        <ExplanationTxt>All voting members have the right to vote on all matters submitted to them for voting, including the election of the governing body.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VI, Section B, Line 8b</FormAndLineReferenceDesc>
        <ExplanationTxt>There are no committees with authority to act on behalf of the governing body.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VI, Section B, Line 11b</FormAndLineReferenceDesc>
        <ExplanationTxt>The Finance Committee reviews the Form 990. Prior to filing, the Form 990 is provided electronically to the full Board for review.</ExplanationTxt>
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      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VI, Section B, Line 12c</FormAndLineReferenceDesc>
        <ExplanationTxt>Director signatures are obtained as evidence that they agree to abide by the terms of the Conflict of Interest Policy.</ExplanationTxt>
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      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VI, Section B, Line 15</FormAndLineReferenceDesc>
        <ExplanationTxt>The Board of Directors perform an annual performance review of the Executive Director and document any changes to her compensation in the minutes of the Board meeting following the review.</ExplanationTxt>
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      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VI, Section C, Line 19</FormAndLineReferenceDesc>
        <ExplanationTxt>There is no policy to make the governing documents and financial statements available to the public. Form 990 is provided to the RI Department of Business Regulation Charitable Solicitation Division.</ExplanationTxt>
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</Return>