Wyoming · 47 of 1,120 · BLM's list, read Oct 20, 2026
Wyoming
47 areas, 1,578,760 acres. At least 47 of them have a claim, lease or right of way inside the line, or a grazing allotment across it.
Every Area of Critical Environmental Concern BLM's Wyoming office holds, the ones with the most inside the line first. Each row opens the area's page: its line, what BLM found there and what sits inside it.
Every area, the most inside first
- Green Mountain ACEC24,924 acres · at least 571 active mining claims and 80 more BLM lists as Filed, 18 oil and gas leases, 2 rights of way, 6 grazing allotments covering part of it597inside
- South Pass Historical Landscape ACEC158,545 acres · at least 485 active mining claims and 942 more BLM lists as Filed or Under Review, 50 rights of way, 20 grazing allotments covering part of it555inside
- South Wind River ACEC281,188 acres · 58 oil and gas leases, 33 rights of way, 18 grazing allotments covering part of it109inside
- Steamboat Mountain ACEC439,123 acres · 39 oil and gas leases, 32 rights of way, 14 grazing allotments covering part of it85inside
- Lander Slope ACEC90,469 acres · 18 rights of way, 41 grazing allotments covering part of it59inside
- Twin Creek ACEC65,109 acres · at least 1 active mining claim and 1 more BLM lists as Filed, 1 oil and gas lease, 22 rights of way, 22 grazing allotments covering part of it46inside
- Trapper's Point ACEC9,468 acres · 27 rights of way, 8 grazing allotments covering part of it35inside
- South Pass Historic Landscape ACEC53,773 acres · at least 3 active mining claims and 2 more BLM lists as Filed, 4 oil and gas leases, 12 rights of way, 14 grazing allotments covering part of it33inside
- Little Mountain ACEC115,571 acres · 1 oil and gas lease, 20 rights of way, 10 grazing allotments covering part of it31inside
- Sheep Mountain ACEC25,978 acres · 9 rights of way, 15 grazing allotments covering part of it24inside
- Pumpkin Buttes ACEC1,743 acres · at least 55 mining claims BLM lists as Filed, 3 oil and gas leases, 16 rights of way, 3 grazing allotments covering part of it22inside
- Special Status Plant Species ACEC4,469 acres · 19 grazing allotments covering part of it19inside
- Red Canyon ACEC23,962 acres · 7 rights of way, 9 grazing allotments covering part of it16inside
- Spanish Point Karst ACEC11,463 acres · 15 grazing allotments covering part of it15inside
- Brown/Howe Dinosaur ACEC5,521 acres · 9 rights of way, 4 grazing allotments covering part of it13inside
- Blowout Penstemon ACEC29,151 acres · at least 96 mining claims BLM lists as Filed, 1 oil and gas lease, 4 rights of way, 7 grazing allotments covering part of it12inside
- Paleocene, Eocene Thermal Maximum (PETM) ACEC14,927 acres · 2 oil and gas leases, 1 right of way, 9 grazing allotments covering part of it12inside
- Upper Owl Creek ACEC14,274 acres · 1 right of way, 11 grazing allotments covering part of it12inside
- Sheep Mountain Anticline ACEC13,316 acres · at least 7 active mining claims, 5 grazing allotments covering part of it12inside
- East Fork ACEC36,563 acres · 4 rights of way, 6 grazing allotments covering part of it10inside
- Sand Hills/JO Ranch ACEC11,977 acres · 6 oil and gas leases, 4 grazing allotments covering part of it10inside
- Carter Mountain ACEC10,846 acres · 1 right of way, 8 grazing allotments covering part of it9inside
- Beaver Rim ACEC6,729 acres · 5 rights of way, 4 grazing allotments covering part of it9inside
- Whiskey Mountain ACEC13,879 acres · 2 rights of way, 6 grazing allotments covering part of it8inside
- New Fork Potholes ACEC1,827 acres · 4 rights of way, 4 grazing allotments covering part of it8inside
- Little Mountain ACEC21,443 acres · 1 right of way, 6 grazing allotments covering part of it7inside
- Rock Creek ACEC4,922 acres · 1 oil and gas lease, 1 right of way, 5 grazing allotments covering part of it7inside
- Beaver Creek ACEC3,100 acres · 4 oil and gas leases, 1 right of way, 2 grazing allotments covering part of it7inside
- Alcova Fossil Area ACEC5,977 acres · 3 rights of way, 3 grazing allotments covering part of it6inside
- Clark's Fork Canyon ACEC4,714 acres · 6 grazing allotments covering part of it6inside
- Welch Ranch ACEC1,117 acres · 5 rights of way, a grazing allotment covering part of it6inside
- Greater Sand Dunes ACEC26,753 acres · 1 oil and gas lease, 4 grazing allotments covering part of it5inside
- Big Sandy Openings ACEC1,994 acres · 2 rights of way, 3 grazing allotments covering part of it5inside
- Jackson Canyon ACEC14,348 acres · 1 right of way, 3 grazing allotments covering part of it4inside
- Five Springs Falls ACEC160 acres · 2 rights of way, 2 grazing allotments covering part of it4inside
- Bridger Butte ACEC604 acres · 3 grazing allotments covering part of it3inside
- Raymond Mountain ACEC12,651 acres · 1 right of way, a grazing allotment covering part of it2inside
- Oregon Buttes ACEC3,441 acres · 2 grazing allotments covering part of it2inside
- Red Gulch Dinosaur Tracksite ACEC1,795 acres · 2 grazing allotments covering part of it2inside
- Big Cedar Ridge ACEC270 acres · 2 grazing allotments covering part of it2inside
- Pine Springs ACEC6,486 acres · a grazing allotment covering part of it1inside
- Whoopup Canyon ACEC1,414 acres · a grazing allotment covering part of it1inside
- Pinnacles ACEC1,344 acres · a grazing allotment covering part of it1inside
- Natural Corrals ACEC1,107 acres · a grazing allotment covering part of it1inside
- Cave Creek Cave ACEC240 acres · a grazing allotment covering part of it1inside
- Cushion Plant Community ACEC62 acres · a grazing allotment covering part of it1inside
- White Mountain Petroglyphs ACEC22 acres · a grazing allotment covering part of it1inside
SheetWyomingLines47Acres1,578,760Inked1988 to 2024ReadOct 20, 2026
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