Wyoming · Area of Critical Environmental Concern

South Pass Historic Landscape ACEC

BLM found a wildlife resource, a cultural value, a scenic value and a historic value here, and its plan calls for special management. BLM's records place at least 3 active mining claims (and 2 more BLM lists as Filed), 4 oil and gas leases and 12 rights of way inside the line today, and 14 grazing allotments cover part of it. It covers 53,773 acres and was designated December 22, 2024, in the Rock Springs Resource Management Plan.

BLM's map carries a second area of nearly the same name: the South Pass Historical Landscape ACEC, 158,545 acres, designated June 26, 2014, in the Lander Resource Management Plan. They're two areas from two plans, and both are counted. Their lines meet along about 19.5 km and overlap on 10.4 acres.

The line

Ground: USGS The National Map, topographic tiles. Boundaries: BLM's own, read Oct 20, 2026. 14 marks are where BLM's own maps draw them; 3 claims are placed at the middle of the section their land description names, not at the stakes on the ground. Hover or tap one for its holder. The 4 leases and 14 grazing allotments below aren't marked.

Who holds the claims

At least 5 claims sit inside this line: 3 active and 2 filed and pending, 1 with a holder BLM names and 4 with a claimant BLM withholds under the Privacy Act. BLM lists 3 as Active and 2 as Filed.

• Names withheld by BLM (private individuals)4claims
• WYOMING PROSPECTORS ASSOC1claim

BLM's mining rules list designated ACECs among the places where mining that disturbs the surface beyond casual use needs a plan of operations BLM approves. Exploration of five acres or less can go ahead on a notice instead.

The rights of way

12 rights of way sit inside the line. BLM files 9 under non-energy facilities and 3 under other energy facilities.

• WYOMING DEPARTMENT OF TRANSPORTATION4rights of way
• PACIFICORP2rights of way
• RADOSEVICH LIVESTOCK2rights of way
• WILLOWBROOK RANCH INC1right of way
• WYOMING STATE - DEPARTMENT OF TRANSPORTATION1right of way

The oil and gas leases

4 active oil and gas leases sit inside the line. 4 of them took effect before the area was designated on December 22, 2024.

• KIRKWOOD OIL & GAS LLC3leases
• KIRKWOOD RESOURCES LLC1lease

Grazing allotments

14 grazing allotments cover part of this line. Their permittees aren't named here yet.

• Pacific Creek197,415acres
• ANTELOPE HILLS197,226acres
• Continental Peak88,417acres
• Little Prospect83,025acres
• ATLANTIC CITY COMMON49,794acres

The nearest areas

• Oregon Buttes ACECWyoming · 3,441 acres · 2 grazing allotments covering part of it8miles
• South Pass Historical Landscape ACECWyoming · 158,545 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 it11miles
• Steamboat Mountain ACECWyoming · 439,123 acres · 39 oil and gas leases, 32 rights of way, 14 grazing allotments covering part of it19miles
• Red Canyon ACECWyoming · 23,962 acres · 7 rights of way, 9 grazing allotments covering part of it21miles
• Pinnacles ACECWyoming · 1,344 acres · a grazing allotment covering part of it22miles

Next to it

South Pass Historical Landscape Area of Critical Environmental Concern touches the line.

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