Wyoming · Area of Critical Environmental Concern
Big Cedar Ridge ACEC
BLM found a natural system, a natural process and a historic 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 two grazing allotments cover part of it. It covers 270 acres and was designated January 28, 1997, in the Washakie Resource Management Plan (Amendment).
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 2 grazing allotments below aren't marked.Grazing allotments
2 grazing allotments cover part of this line. Their permittees aren't named here yet.
- CEDAR RIDGE8,890acres
- BUFFALO CREEK5,996acres
The nearest areas
- Spanish Point Karst ACECWyoming · 11,463 acres · 15 grazing allotments covering part of it39miles
- Red Gulch Dinosaur Tracksite ACECWyoming · 1,795 acres · 2 grazing allotments covering part of it45miles
- Brown/Howe Dinosaur ACECWyoming · 5,521 acres · 9 rights of way, 4 grazing allotments covering part of it58miles
- Sheep Mountain Anticline ACECWyoming · 13,316 acres · at least 7 active mining claims, 5 grazing allotments covering part of it62miles
- Five Springs Falls ACECWyoming · 160 acres · 2 rights of way, 2 grazing allotments covering part of it70miles
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 Big Cedar Ridge 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