Wyoming · Area of Critical Environmental Concern
Whoopup Canyon ACEC
BLM found a cultural value here, and its plan calls for special management. BLM's records place no claim, lease or right of way inside the line today, and a grazing allotment covers part of it. It covers 1,414 acres and was designated August 25, 2000, in the Newcastle Resource Management Plan.
One of the 1,120 places the Bureau of Land Management has designated an Area of Critical Environmental Concern. This page shows its line, what BLM found there and what sits inside it.
The line
Ground: USGS The National Map, topographic tiles. Boundaries: BLM's own, read Oct 20, 2026. The grazing allotment below isn't marked.Grazing allotments
A grazing allotment covers part of this line. Its permittee isn't named here yet.
- ROCK CANYON7,038acres
The nearest areas
- Fossil CycadMontana/Dakotas · 318 acres · 1 right of way, a grazing allotment covering part of it30miles
- Fort Meade Recreation AreaMontana/Dakotas · 6,386 acres · 14 rights of way, 2 grazing allotments covering part of it55miles
- Pumpkin Buttes ACECWyoming · 1,743 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 it89miles
- Finger ButtesMontana/Dakotas · 1,521 acres · 4 grazing allotments covering part of it110miles
- Reynolds BattlefieldMontana/Dakotas · 928 acres · 4 grazing allotments covering part of it127miles
More from BLM's Wyoming office
Every area BLM's Wyoming office holdsThe proposed rule
A proposed rule, RIN 1004-AF53, would change how BLM drafts every land use plan, and how it designates ACECs like Whoopup Canyon 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