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      <Desc>Outdoor Program Centers - The Appalachian Mountain Club (the AMC) manages more than 40 outdoor program centers and backcountry facilities, including lodges, mountain huts, full-service camps, cabins, shelters and campgrounds. These AMC facilities serve as a base for 4-season recreational activities, nature and environmental education courses, programs, scientific research, outdoor artistic pursuits, and other conservation-related activities. Visitors and overnight guests enjoy a broad range of walk-on programs, guided naturalist activities, outdoor recreational safety and skill building workshops, and backcountry activities to choose from. AMC facilities *Refer to Schedule O, Page 47 for Continuation*Outdoor Program Centers (Continued):are managed to reduce environmental impact by providing environmentally sensitive septic systems, composting, public drinking water, and overnight accommodations (some near treeline and in sensitive alpine areas) in areas where camping would have severe effects on the alpine plant life. The AMC facilities provide information and education on the local environment, recreational opportunities, outdoor safety, trails, and emergency shelter. The AMC staff also participates in search-and-rescue efforts throughout the White Mountains of NH and other regions. In 2023, the AMC provided 126,486 overnight guest accommodations at its facilities and information and other services to more than 2 million visitors.</Desc>
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        <Desc>Membership - The Appalachian Mountain Club (the AMC) members provide the grassroots network through which the AMC delivers its programming on a local level throughout our 12 state and district regions. The more than 400,000 members, advocates and supporters of the AMC provide a base of volunteers for trail projects, local clean-up and conservation projects, outdoor education and safety instruction. These members and volunteers organize and lead thousands of recreational outings and provide the local governance structure for the 11 local AMC chapters. Member dues and participation in the above mentioned activities provide a critical base of support for carrying out the AMC mission.</Desc>
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        <Desc>Conservation Research and Policy - The Appalachian Mountain Club (the AMC) actively fosters the protection, enjoyment and understanding of the outdoors. The AMC's Research and Policy Program conducts analyses of natural ecosystems to guide our efforts to protect natural and recreational resources from Maine to Virginia. This includes studying changes in land cover and land use and the impact of these changes on ecological and recreational resources; monitoring air quality and climate change impacts on Northeastern mountain ecosystems; analyzing in-stream flow criteria and hydroelectric dam operation impacts on river ecosystems and recreational resources; developing methods to reduce recreational user impacts on the region's*Refer to Schedule O, Pages 47-48 for Continuation*Conservation Research and Policy (Continued):mountains and trails; and studying the benefits and impacts of different transportation options and energy sources, including renewable energy, on the ecosystems of concern to the AMC. Achievements are exemplified by the development and successful implementation of the recovery plan for an alpine plant formerly listed on the federal endangered species list, publication of a national award winning "Ecological Atlas of the Upper Androscoggin Watershed", adoption by states of elements of AMC's wind power and solar siting guidelines and AMC's successful citizen science mountain monitoring program, Northeast Alpine Flower Watch and Flower and Fauna of the White Mountain National Forest.The AMC's Research and Policy program also works with conservation partners and local communities to build grassroots support for priority conservation projects. The Research and Policy Program participates in and comments on formal resource management programs and decisions at the local, state, and federal level; consults with industry and landowners to find equitable solutions to environmental problems; advocates for state and federal land protection, clean air, climate and energy policies, and trails funding, and facilitates member and public participation in local, state and federal environmental issues and policy. AMC's strategy for land conservation in the 100-Mile Wilderness region in Maine includes addressing regional ecological and economic needs through outdoor recreation, resource protection, sustainable forestry and community partnerships.</Desc>
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        <PersonNm>Shalin Desai</PersonNm>
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      <Form990PartVIISectionAGrp>
        <PersonNm>Birgitta Dickerson</PersonNm>
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      <Form990PartVIISectionAGrp>
        <PersonNm>Cheryl Duckworth</PersonNm>
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        <AverageHoursPerWeekRt>2.00</AverageHoursPerWeekRt>
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      <Form990PartVIISectionAGrp>
        <PersonNm>Dee Dee Mozeleski</PersonNm>
        <TitleTxt>Director</TitleTxt>
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      <Form990PartVIISectionAGrp>
        <PersonNm>Samarjit Shankar</PersonNm>
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      <Form990PartVIISectionAGrp>
        <PersonNm>Shan Soe-Lin Hecht</PersonNm>
        <TitleTxt>Director</TitleTxt>
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      <Form990PartVIISectionAGrp>
        <PersonNm>Bill Tyree</PersonNm>
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        <PersonNm>Jenna Whitney</PersonNm>
        <TitleTxt>Director</TitleTxt>
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      <Form990PartVIISectionAGrp>
        <PersonNm>Nick Wilkoff</PersonNm>
        <TitleTxt>Director</TitleTxt>
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      <Form990PartVIISectionAGrp>
        <PersonNm>Eileen Yin</PersonNm>
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        <PersonNm>Beth Zimmer</PersonNm>
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        <PersonNm>Nicole Zussman</PersonNm>
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      <Form990PartVIISectionAGrp>
        <PersonNm>Jennifer Norris</PersonNm>
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      <Form990PartVIISectionAGrp>
        <PersonNm>Rondi Stearns</PersonNm>
        <TitleTxt>VP Comm &amp; Marketing, until 10/2/23</TitleTxt>
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        <OtherCompensationAmt>25411</OtherCompensationAmt>
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      <Form990PartVIISectionAGrp>
        <PersonNm>Paul Cunha</PersonNm>
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      <Form990PartVIISectionAGrp>
        <PersonNm>Heather Clish</PersonNm>
        <TitleTxt>VP Conservation &amp; Recreatn Advocacy</TitleTxt>
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        <OtherCompensationAmt>10378</OtherCompensationAmt>
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      <Form990PartVIISectionAGrp>
        <PersonNm>Steve Tatko</PersonNm>
        <TitleTxt>VP Conservation Research &amp; Land Mgmt</TitleTxt>
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      <Form990PartVIISectionAGrp>
        <PersonNm>Libbi Cinti</PersonNm>
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        <OtherCompensationAmt>12677</OtherCompensationAmt>
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      <Form990PartVIISectionAGrp>
        <PersonNm>Faith Salter</PersonNm>
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      <Form990PartVIISectionAGrp>
        <PersonNm>Charles W Johnston Jr</PersonNm>
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      <Form990PartVIISectionAGrp>
        <PersonNm>Nicholas Stevens</PersonNm>
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      <Form990PartVIISectionAGrp>
        <PersonNm>Crystal Mandler</PersonNm>
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      <Form990PartVIISectionAGrp>
        <PersonNm>Scarlet Batchelor</PersonNm>
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        <PersonNm>Gary Gresh</PersonNm>
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        <PersonNm>Esther DeVito</PersonNm>
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      <Form990PartVIISectionAGrp>
        <PersonNm>Margaret McNamara</PersonNm>
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      <Form990PartVIISectionAGrp>
        <PersonNm>Will King</PersonNm>
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      <Form990PartVIISectionAGrp>
        <PersonNm>Theresa Morrow</PersonNm>
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          <BusinessName>
            <BusinessNameLine1Txt>Federal Direct</BusinessNameLine1Txt>
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        <ContractorAddress>
          <USAddress>
            <AddressLine1Txt>95 Main Avenue</AddressLine1Txt>
            <CityNm>Clifton</CityNm>
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      <ContractorCompensationGrp>
        <ContractorName>
          <BusinessName>
            <BusinessNameLine1Txt>William W London &amp; Sons Inc</BusinessNameLine1Txt>
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          <USAddress>
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      <ContractorCompensationGrp>
        <ContractorName>
          <BusinessName>
            <BusinessNameLine1Txt>Sargent Corporation</BusinessNameLine1Txt>
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          <USAddress>
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        <ContractorName>
          <BusinessName>
            <BusinessNameLine1Txt>Joe Brigham Inc</BusinessNameLine1Txt>
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          <BusinessName>
            <BusinessNameLine1Txt>Versa Press Inc</BusinessNameLine1Txt>
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          <USAddress>
            <AddressLine1Txt>1465 Spring Bay Road</AddressLine1Txt>
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            <StateAbbreviationCd>IL</StateAbbreviationCd>
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      <MembershipDuesAmt>2526883</MembershipDuesAmt>
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        <Desc>Miscellaneous</Desc>
        <BusinessCd>900099</BusinessCd>
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      <GrantsToDomesticOrgsGrp>
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        <ProgramServicesAmt>445691</ProgramServicesAmt>
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        <ProgramServicesAmt>578051</ProgramServicesAmt>
        <ManagementAndGeneralAmt>983543</ManagementAndGeneralAmt>
        <FundraisingAmt>222918</FundraisingAmt>
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        <ProgramServicesAmt>11806522</ProgramServicesAmt>
        <ManagementAndGeneralAmt>2122638</ManagementAndGeneralAmt>
        <FundraisingAmt>1283418</FundraisingAmt>
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        <ProgramServicesAmt>366331</ProgramServicesAmt>
        <ManagementAndGeneralAmt>92490</ManagementAndGeneralAmt>
        <FundraisingAmt>56045</FundraisingAmt>
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        <ProgramServicesAmt>1068314</ProgramServicesAmt>
        <ManagementAndGeneralAmt>302014</ManagementAndGeneralAmt>
        <FundraisingAmt>182286</FundraisingAmt>
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        <ProgramServicesAmt>947920</ProgramServicesAmt>
        <ManagementAndGeneralAmt>218823</ManagementAndGeneralAmt>
        <FundraisingAmt>109437</FundraisingAmt>
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        <TotalAmt>37288</TotalAmt>
        <ProgramServicesAmt>38704</ProgramServicesAmt>
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        <FormAndLineReferenceDesc>Part III, Line 1a:</FormAndLineReferenceDesc>
        <ExplanationTxt>AMC Library &amp; Archive Collection: Collection items are primary and secondary source documents, institutional records, and artifacts related to the historical programs of the AMC, which are catalogued and preserved for educational and research purposes. No collection items were capitalized as of December 31, 2023 and 2022.</ExplanationTxt>
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      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Part III, Line 4:</FormAndLineReferenceDesc>
        <ExplanationTxt>The AMC Library &amp; Archives have been an integral part of the AMC since the AMC's founding year. They anchor a remarkable landscape in which the past lies alongside the present and future of the AMC and the Northeast outdoors. The Library's collection consists of over 2,500 monograph and serial titles. It represents one of the most extensive outdoor recreation book collections in the Northeast and counts among its holdings works on the history of mountaineering, early climbing expeditions, and early explorations. The book collection also contains a vast amount of background information on environmental issues and outdoor activities. The Archive's collection consists of meeting minutes, annual reports, AMC bulletins and journals, scrapbooks, climbing journals, manuscripts, summit registers, photographic works, films, memorabilia, and maps. Logbooks that are no longer sound enough to reside in the AMC's historic White Mountain huts can be found here, recording the thoughts and feelings of mountain travelers from decades past. The Archives are particularly rich in visual images, with well over 20,000 images covering the 1870's to the present. The Library &amp; Archives are strongly linked to the AMC's mission. They help to build awareness of the AMC using the Club's images and information in a wide range of publications, educational programming, and display materials. The Library &amp; Archives support all departments in their historical documentation needs from preserving their departmental records to providing materials for AMC's journal, website, marketing campaigns, development efforts, programming, lodging, and the like. The long history of the organization that is housed by the Library &amp; Archives lends credibility and understanding to the Club's current organization and its initiatives.</ExplanationTxt>
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      <SupplementalInformationDetail>
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        <ExplanationTxt>AMC's endowment funds serve as a perpetual source of financial support for the Club's programs and activities. Funds are either restricted by donors or by AMC's Board of Directors, and support purposes that include conservation, education, White Mountain huts and trails, volunteer managed activities, library and archives, and general support.</ExplanationTxt>
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      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Part X, Line 2:</FormAndLineReferenceDesc>
        <ExplanationTxt>In determining recognition of uncertain tax positions, the AMC recognizes the financial statement impact of a tax position when it is more likely than not that the position will be sustained upon examination by a taxing authority. As of December 31, 2023, the AMC has no uncertain tax positions that qualify for either recognition or disclosure in the consolidated financial statements.</ExplanationTxt>
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      <LoansOrGuaranteesFromOthOrgInd>0</LoansOrGuaranteesFromOthOrgInd>
      <DivRelatedOrganizationInd>0</DivRelatedOrganizationInd>
      <AssetSaleToOtherOrgInd>0</AssetSaleToOtherOrgInd>
      <AssetPurchaseFromOtherOrgInd>0</AssetPurchaseFromOtherOrgInd>
      <AssetExchangeInd>0</AssetExchangeInd>
      <RentalOfFacilitiesToOthOrgInd>0</RentalOfFacilitiesToOthOrgInd>
      <RentalOfFcltsFromOthOrgInd>0</RentalOfFcltsFromOthOrgInd>
      <PerformOfServicesForOthOrgInd>0</PerformOfServicesForOthOrgInd>
      <PerformOfServicesByOtherOrgInd>0</PerformOfServicesByOtherOrgInd>
      <SharingOfFacilitiesInd>0</SharingOfFacilitiesInd>
      <PaidEmployeesSharingInd>0</PaidEmployeesSharingInd>
      <ReimbursementPaidToOtherOrgInd>1</ReimbursementPaidToOtherOrgInd>
      <ReimbursementPaidByOtherOrgInd>0</ReimbursementPaidByOtherOrgInd>
      <TransferToOtherOrgInd>0</TransferToOtherOrgInd>
      <TransferFromOtherOrgInd>0</TransferFromOtherOrgInd>
      <TransactionsRelatedOrgGrp>
        <OtherOrganizationName>
          <BusinessNameLine1Txt>AMC Maine Woods Initiative LLC</BusinessNameLine1Txt>
        </OtherOrganizationName>
        <TransactionTypeTxt>P</TransactionTypeTxt>
        <InvolvedAmt>3370672</InvolvedAmt>
      </TransactionsRelatedOrgGrp>
    </IRS990ScheduleR>
  </ReturnData>
</Return>