Wyoming · Area of Critical Environmental Concern
Little Mountain ACEC
One of 2 areas BLM's Wyoming office names Little Mountain ACEC; this one is 21,443 acres. All of them. BLM found a wildlife resource, a cultural value, a scenic value, a natural process and a historic value here, and its plan calls for special management. BLM's records place 1 right of way inside the line today, and six grazing allotments cover part of it. It covers 21,443 acres and was designated November 8, 1990, in the Cody 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
The rights of way
1 right of way sits inside the line. BLM files 1 under non-energy facilities.
- E O BISCHOFF RANCH CO1right of way
Grazing allotments
6 grazing allotments cover part of this line. Their permittees aren't named here yet.
- Allotment USFS-GRZ-10000.01045235,171acres
- Moss Ranch21,783acres
- Little Mountain21,647acres
- Natural Trap17,463acres
- Mexican Hills6,175acres
- Burnham3,256acres
The nearest areas
- Five Springs Falls ACECWyoming · 160 acres · 2 rights of way, 2 grazing allotments covering part of it11miles
- East Pryor MountainMontana/Dakotas · 11,061 acres · at least 24 active mining claims, 3 rights of way, 4 grazing allotments covering part of it14miles
- Pryor FoothillsMontana/Dakotas · 2,606 acres · 3 grazing allotments covering part of it18miles
- Petroglyph CanyonMontana/Dakotas · 239 acres · 2 grazing allotments covering part of it21miles
- Sheep Mountain Anticline ACECWyoming · 13,316 acres · at least 7 active mining claims, 5 grazing allotments covering part of it23miles
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 Little Mountain 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