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Private foundations don’t post open calls, so nobody can search them. We read IRS filings instead — 9.6 million grants from 174,053 foundations and grantmaking charities, searchable by what the money was actually for.

12 funders with a record of paying for “trout”

Where the money went

1.0×
National Fish and Wildlife Foundation → Trout Unlimited Inc: $15M across 3 grants, latest 2023The William & Flora Hewlett Foundation → Trout Unlimited Inc: $3.5M across 4 grants, latest 2024Gs Donor Advised Philanthropy Fund → California Trout: $1.3M across 3 grants, latest 2024Marin Community Foundation → Trout Unlimited National Office: $1.2M across 4 grants, latest 2024Resources Legacy Fund → Trout Unlimited Inc: $1.2M across 3 grants, latest 2024Richard King Mellon Foundation → Trout Unlimited: $1.2M across 5 grants, latest 2023The Nature Conservancy → Trout Unlimited Inc: $556K across 5 grants, latest 2024Jackson Hole One Fly Foundation → Trout Unlimited: $258K across 10 grants, latest 2025American Rivers Inc → Trout Unlimited Va: $191K across 3 grants, latest 2024Foundation for Pennsylvania → Pennsylvania Trout Inc: $92K across 2 grants, latest 2022Scott and Jessica Mcclintock Foundation → Trout Unlimited Inc: $78K across 11 grants, latest 2024Smith-Welsh Foundation → Conservative Angler: $60K across 4 grants, latest 2025National Fish and Wildlife Foundation → California Trout Inc: $2.4M across 3 grants, latest 2023Marin Community Foundation → Upper Missouri Waterkeeper Inc: $925K across 2 grants, latest 2024Resources Legacy Fund → California Trout Inc: $834K across 2 grants, latest 2024Richard King Mellon Foundation → Trout Unlimited Inc: $550K across 2 grants, latest 2024The William & Flora Hewlett Foundation → California Trout: $395K across 6 grants, latest 2024The Nature Conservancy → California Trout Inc: $336K across 5 grants, latest 2024Gs Donor Advised Philanthropy Fund → Trout Unlimited: $201K across 3 grants, latest 2024Jackson Hole One Fly Foundation → Friends of the Teton River: $164K across 4 grants, latest 2025American Rivers Inc → Trout Unlimited: $143K across 2 grants, latest 2022Foundation for Pennsylvania → Trout Unlimited Inc: $92K across 2 grants, latest 2024Smith-Welsh Foundation → Trout Unlimited: $30K across 3 grants, latest 2025National Fish and Wildlife Foundation → Us Forest Service: $1.7M across 1 grant, latest 2023Marin Community Foundation → California Trout Inc: $900K across 4 grants, latest 2024Resources Legacy Fund → California Trout: $481K across 1 grant, latest 2022American Rivers Inc → California Trout: $136K across 5 grants, latest 2024Jackson Hole One Fly Foundation → Grand Teton National Park Foundatio: $127K across 2 grants, latest 2023Gs Donor Advised Philanthropy Fund → Trout Unlimited Inc: $77K across 3 grants, latest 2024Foundation for Pennsylvania → Pennsylvania Council of Trout Unlim: $50K across 1 grant, latest 2024The Nature Conservancy → Five Rivers Chapter of Trout Unlimited Chapter 451: $25K across 1 grant, latest 2022Smith-Welsh Foundation → California Trout: $20K across 2 grants, latest 2025National Fish and Wildlife Foundation → Wildlands Conservancy Inc: $610K across 1 grant, latest 2023National Fish and Wildlife Foundation → Western Pennsylvania Conservancy: $551K across 1 grant, latest 2023National Fish and Wildlife Foundation → Potter County Conservation District: $511K across 1 grant, latest 2023National Fish and Wildlife Foundation → Superior Watershed Partnership: $445K across 1 grant, latest 2023National Fish and Wildlife Foundation → Huron Pines Resource Conservation & Development Council Inc: $433K across 1 grant, latest 2023National Fish and Wildlife Foundation → Deschutes River Conservancy: $373K across 1 grant, latest 2023National Fish and Wildlife Foundation → North Fork John Day Watershed Council: $373K across 1 grant, latest 2023Resources Legacy Fund → Trout Unlimited: $337K across 2 grants, latest 2023National Fish and Wildlife Foundation → Connecticut River Watershed Council Dba Connecticut River Conservancy: $330K across 1 grant, latest 2023National Fish and Wildlife Foundation → Headwaters Soil and Water Conservation District: $238K across 1 grant, latest 2023National Fish and Wildlife Foundation → Rio Grande Return: $225K across 1 grant, latest 2023National Fish and Wildlife Foundation → Conservation Resource Alliance: $222K across 1 grant, latest 2023National Fish and Wildlife Foundation → Michigan Trout Unlimited: $215K across 2 grants, latest 2023National Fish and Wildlife Foundation → Montana Trout Unlimited: $186K across 1 grant, latest 2023National Fish and Wildlife Foundation → Housatonic Valley Association Inc: $164K across 1 grant, latest 2023Resources Legacy Fund → Montana Trout Unlimited: $150K across 1 grant, latest 2024National Fish and Wildlife Foundation → Belknap County Conservation District: $150K across 2 grants, latest 2023National Fish and Wildlife Foundation → Lake County Swcd: $147K across 1 grant, latest 2023National Fish and Wildlife Foundation → Michigan Trout Unlimited (Aka Trout Unlimited Michigan Council): $135K across 1 grant, latest 2021National Fish and Wildlife Foundation → State of Vermont Natural Resources Conservation Council (Nrcc): $118K across 1 grant, latest 2023National Fish and Wildlife Foundation → Muskegon River Watershed Assembly: $116K across 1 grant, latest 2023National Fish and Wildlife Foundation → New England Forestry Foundation Inc: $105K across 1 grant, latest 2023National Fish and Wildlife Foundation → Sonoma Resource Conservation District: $91K across 2 grants, latest 2023National Fish and Wildlife Foundation → Rangeley Lakes Heritage Trust: $77K across 1 grant, latest 2022Jackson Hole One Fly Foundation → Wyoming Game and Fish Dept: $73K across 2 grants, latest 2024National Fish and Wildlife Foundation → Maryland Department of Natural Resources: $73K across 1 grant, latest 2023National Fish and Wildlife Foundation → Telluride Foundation: $70K across 2 grants, latest 2023Jackson Hole One Fly Foundation → Henry's Fork Foundation: $68K across 3 grants, latest 2025National Fish and Wildlife Foundation → Ndponics Inc: $68K across 1 grant, latest 2023National Fish and Wildlife Foundation → Maine Audubon Society: $62K across 1 grant, latest 2023National Fish and Wildlife Foundation → Onondaga Environmental Institute: $60K across 1 grant, latest 2022National Fish and Wildlife Foundation → Project Share: $54K across 1 grant, latest 2023National Fish and Wildlife Foundation: $25M on this topic. Open the funder.National Fish and Wildlife Fo…$25MThe William & Flora Hewlett Foundation: $3.8M on this topic. Open the funder.The William & Flora Hewlett F…$3.8MMarin Community Foundation: $3.1M on this topic. Open the funder.Marin Community Foundation$3.1MResources Legacy Fund: $3.0M on this topic. Open the funder.Resources Legacy Fund$3.0MRichard King Mellon Foundation: $1.8M on this topic. Open the funder.Richard King Mellon Foundation$1.8MGs Donor Advised Philanthropy Fund: $1.6M on this topic. Open the funder.Gs Donor Advised Philanthropy…$1.6MThe Nature Conservancy: $917K on this topic. Open the funder.The Nature Conservancy$917KJackson Hole One Fly Foundation: $689K on this topic. Open the funder.Jackson Hole One Fly Foundati…$689KAmerican Rivers Inc: $469K on this topic. Open the funder.American Rivers Inc$469KFoundation for Pennsylvania: $234K on this topic. Open the funder.Foundation for Pennsylvania$234KSmith-Welsh Foundation: $110K on this topic. Open the funder.Smith-Welsh Foundation$110KScott and Jessica Mcclintock Foundation: $78K on this topic. Open the funder.Scott and Jessica Mcclintock…$78KTrout Unlimited Inc: received $21M on this topicTrout Unlimited Inc$21MCalifornia Trout Inc: received $4.5M on this topicCalifornia Trout Inc$4.5MCalifornia Trout: received $2.4M on this topicCalifornia Trout$2.4MTrout Unlimited: received $2.2M on this topicTrout Unlimited$2.2MUs Forest Service: received $1.7M on this topicUs Forest Service$1.7MTrout Unlimited National Office: received $1.2M on this topicTrout Unlimited National Office$1.2MUpper Missouri Waterkeeper Inc: received $925K on this topicUpper Missouri Waterkeeper Inc$925KWildlands Conservancy Inc: received $610K on this topicWildlands Conservancy Inc$610KWestern Pennsylvania Conservancy: received $551K on this topicWestern Pennsylvania Conservancy$551KPotter County Conservation District: received $511K on this topicPotter County Conservation Dist…$511KSuperior Watershed Partnership: received $445K on this topicSuperior Watershed Partnership$445KHuron Pines Resource Conservation & Development Council Inc: received $433K on this topicHuron Pines Resource Conservati…$433KDeschutes River Conservancy: received $373K on this topicDeschutes River Conservancy$373KNorth Fork John Day Watershed Council: received $373K on this topicNorth Fork John Day Watershed C…$373KMontana Trout Unlimited: received $336K on this topicMontana Trout Unlimited$336KConnecticut River Watershed Council Dba Connecticut River Conservancy: received $330K on this topicConnecticut River Watershed Cou…$330KHeadwaters Soil and Water Conservation District: received $238K on this topicHeadwaters Soil and Water Conse…$238KRio Grande Return: received $225K on this topicRio Grande Return$225KConservation Resource Alliance: received $222K on this topicConservation Resource Alliance$222KMichigan Trout Unlimited: received $215K on this topicMichigan Trout Unlimited$215KTrout Unlimited Va: received $191K on this topicTrout Unlimited Va$191KFriends of the Teton River: received $164K on this topicFriends of the Teton River$164KHousatonic Valley Association Inc: received $164K on this topicHousatonic Valley Association I…$164KBelknap County Conservation District: received $150K on this topicBelknap County Conservation Dis…$150KLake County Swcd: received $147K on this topicLake County Swcd$147KMichigan Trout Unlimited (Aka Trout Unlimited Michigan Council): received $135K on this topicMichigan Trout Unlimited (Aka T…$135KGrand Teton National Park Foundatio: received $127K on this topicGrand Teton National Park Found…$127KState of Vermont Natural Resources Conservation Council (Nrcc): received $118K on this topicState of Vermont Natural Resour…$118KMuskegon River Watershed Assembly: received $116K on this topicMuskegon River Watershed Assemb…$116KNew England Forestry Foundation Inc: received $105K on this topicNew England Forestry Foundation…$105KPennsylvania Trout Inc: received $92K on this topicPennsylvania Trout Inc$92KSonoma Resource Conservation District: received $91K on this topicSonoma Resource Conservation Di…$91KRangeley Lakes Heritage Trust: received $77K on this topicRangeley Lakes Heritage Trust$77KWyoming Game and Fish Dept: received $73K on this topicWyoming Game and Fish Dept$73KMaryland Department of Natural Resources: received $73K on this topicMaryland Department of Natural…$73KTelluride Foundation: received $70K on this topicTelluride Foundation$70KHenry's Fork Foundation: received $68K on this topicHenry's Fork Foundation$68KNdponics Inc: received $68K on this topicNdponics Inc$68KMaine Audubon Society: received $62K on this topicMaine Audubon Society$62KOnondaga Environmental Institute: received $60K on this topicOnondaga Environmental Institute$60KConservative Angler: received $60K on this topicConservative Angler$60KProject Share: received $54K on this topicProject Share$54KPennsylvania Council of Trout Unlim: received $50K on this topicPennsylvania Council of Trout U…$50KFive Rivers Chapter of Trout Unlimited Chapter 451: received $25K on this topicFive Rivers Chapter of Trout Un…$25K
12 funders, 44 recipients, grants matching “trout” only. Ribbon width is proportional to the total given; each funder has its own colour (smaller funders in gray). Hover a name to isolate its flows, click a funder to open it. Drag to move around; zoom with the buttons, a double-click, or the wheel after clicking the map.

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Source: IRS Form 990-PF Part XV and Form 990 Schedule I, tax years 2019–2025. These are grants already paid, a record of what an organization funds rather than an open call. Private foundations rarely accept unsolicited applications and the route in is usually a program officer; grantmaking charities and associations more often run real application cycles, so check their website. How this data is built, and its limits →