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Wyoming · Area of Critical Environmental Concern

Twin Creek ACEC

BLM found a natural system, a wildlife resource, a scenic value, a natural process and a historic value here, and its plan calls for special management. BLM's records place at least 1 active mining claim (and 1 more BLM lists as Filed), 1 oil and gas lease and 22 rights of way inside the line today, and 22 grazing allotments cover part of it. It covers 65,109 acres and was designated June 26, 2014, in the Lander Resource Management Plan.

Acres65,109
DesignatedJun 26, 2014Lander Resource Management Plan
BLM founda natural system, a wildlife resource, a scenic value, a natural process and a historic valueand found it important
Inside, at least46claims, leases, rights of way and allotments, and 1 more claim BLM lists as Filed

The line

Twin Creek ACEC
Claimant withheld by BLM, 1Filed, claimant withheld, 1Right of way, 22
Ground: USGS The National Map, topographic tiles. Boundaries: BLM's own, read Oct 20, 2026. 23 marks are where BLM's own maps draw them; 1 claim is placed at the middle of the section its land description names, not at the stakes on the ground. Hover or tap one for its holder. The lease and 22 grazing allotments below aren't marked.

Who holds the claims

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

  • Names withheld by BLM (private individuals)2claims

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

22 rights of way sit inside the line. BLM files 13 under non-energy facilities, 7 under other energy facilities and 2 under oil & gas facilities.

  • QWEST CORP6rights of way
  • Holder not listed by BLM3rights of way
  • WYOMING DEPARTMENT OF TRANSPORTATION3rights of way
  • HIGH PLAINS POWER INC3rights of way
  • High Plains Power, Inc2rights of way

The oil and gas leases

1 active oil and gas lease sits inside the line. 0 of it took effect before the area was designated on June 26, 2014.

  • SOUTH PASS PETROLEUM INC1lease

Grazing allotments

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

  • GOVERNMENT DRAW86,459acres
  • EAST BEAVER COMMON69,839acres
  • GOVT DRW-LWR BEAVER31,340acres
  • TWIN CK. INDIVIDUAL14,564acres
  • HALL CK. INDIVIDUAL14,422acres

The nearest areas

Next to it

Red Canyon Area of Critical Environmental Concern touches the line.

More from BLM's Wyoming office

Every area BLM's Wyoming office holds

The proposed rule

A proposed rule, RIN 1004-AF53, would change how BLM drafts every land use plan, and how it designates ACECs like Twin Creek ACEC. The comment window hasn't opened: the proposed rule wasn't in the Federal Register at our last check. The Watch sends one email the day it prints.

The rule's abstract

The purpose of this rulemaking is to establish in regulations an updated process for the approval of the development, revision, amendment, and maintenance of land use plans, as provided for by the Federal Land Policy and Management Act of 1976, for public lands administered by the Bureau of Land Management (BLM). Additionally, this rulemaking will provide clarification of the process the BLM uses for designating Areas of Critical Environmental Concern.Unified Agenda entry for RIN 1004-AF53, Publication ID 2026, reginfo.gov (OMB OIRA), read Oct 18, 2026

Watch the ruleWhere the rule stands