Wyoming · Area of Critical Environmental Concern
Clark's Fork Canyon ACEC
BLM found a natural system, 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 no claim, lease or right of way inside the line today, and six grazing allotments cover part of it. It covers 4,714 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
Ground: USGS The National Map, topographic tiles. Boundaries: BLM's own, read Oct 20, 2026. The 6 grazing allotments below aren't marked.Grazing allotments
6 grazing allotments cover part of this line. Their permittees aren't named here yet.
- Simpson47,839acres
- Allotment USFS-GRZ-10057.01033728,759acres
- Newmeyer Creek3,336acres
- Clarksfork Canyon940acres
- Billy Goat258acres
- Allotment USFS-GRZ-1350645.010602–acres
The nearest areas
- Grove CreekMontana/Dakotas · 8,252 acres · 3 rights of way, 3 grazing allotments covering part of it16miles
- Meeteetse SpiresMontana/Dakotas · 1,523 acres · 1 right of way, 3 grazing allotments covering part of it20miles
- Paleocene, Eocene Thermal Maximum (PETM) ACECWyoming · 14,927 acres · 2 oil and gas leases, 1 right of way, 9 grazing allotments covering part of it23miles
- Sheep Mountain ACECWyoming · 25,978 acres · 9 rights of way, 15 grazing allotments covering part of it27miles
- Weatherman DrawMontana/Dakotas · 12,282 acres · 2 rights of way, 5 grazing allotments covering part of it30miles
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 Clark's Fork 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