Wyoming · Area of Critical Environmental Concern
Sheep Mountain ACEC
BLM found a wildlife resource, a natural process and a historic value here, and its plan calls for special management. BLM's records place 9 rights of way inside the line today, and 15 grazing allotments cover part of it. It covers 25,978 acres and was designated September 21, 2015, 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
9 rights of way sit inside the line. BLM files 8 under non-energy facilities and 1 under other energy facilities.
- A private individual, name withheld by this site3rights of way
- Holder not listed by BLM2rights of way
- BALLINGER ROCKING R LP1right of way
- QWEST CORP1right of way
- POST CREEK ROAD MAINTENANCE ASSOC LLC1right of way
- LAPUA ACQUISITION TRUST1right of way
Grazing allotments
15 grazing allotments cover part of this line. Their permittees aren't named here yet.
- Diamond Bar Ranch8,261acres
- Stonebridge Reservoir7,236acres
- Lower Slope4,618acres
- Mountain Slope3,568acres
- Hidden Valley2,889acres
- Sheep Mountain 30442,465acres
- McCarty2,062acres
- Timber Creek2,022acres
- Red Pole1,805acres
- Dorrance1,629acres
- Allotment USFS-GRZ-10012.0103371,588acres
- Upton1,102acres
- Post Creek747acres
- Castle Rock682acres
- Allotment USFS-GRZ-10013.010337–acres
The nearest areas
- Carter Mountain ACECWyoming · 10,846 acres · 1 right of way, 8 grazing allotments covering part of it16miles
- Clark's Fork Canyon ACECWyoming · 4,714 acres · 6 grazing allotments covering part of it27miles
- Paleocene, Eocene Thermal Maximum (PETM) ACECWyoming · 14,927 acres · 2 oil and gas leases, 1 right of way, 9 grazing allotments covering part of it32miles
- Grove CreekMontana/Dakotas · 8,252 acres · 3 rights of way, 3 grazing allotments covering part of it43miles
- Meeteetse SpiresMontana/Dakotas · 1,523 acres · 1 right of way, 3 grazing allotments covering part of it47miles
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 Sheep 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