Wyoming · Area of Critical Environmental Concern
Brown/Howe Dinosaur ACEC
BLM found a natural process here, and its plan calls for special management. BLM's records place 9 rights of way inside the line today, and four grazing allotments cover part of it. It covers 5,521 acres and was designated January 1, 1995, in the Cody 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
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.
- CODY FIELD OFFICE2rights of way
- IRONWOOD RANCH WY LLC1right of way
- SPRING DITCH ROAD INC1right of way
- BIG HORN CNTY OF1right of way
- TCT WEST INC1right of way
- Holder not listed by BLM1right of way
- DOUBLE DOC RANCH INC1right of way
- RJS RANCHES LLC1right of way
Grazing allotments
4 grazing allotments cover part of this line. Their permittees aren't named here yet.
- Allotment USFS-GRZ-10015.0104529,780acres
- Red Canyon7,641acres
- Allotment USFS-GRZ-10004.0104526,454acres
- Cedar Creek2,749acres
The nearest areas
- Five Springs Falls ACECWyoming · 160 acres · 2 rights of way, 2 grazing allotments covering part of it13miles
- Red Gulch Dinosaur Tracksite ACECWyoming · 1,795 acres · 2 grazing allotments covering part of it13miles
- Sheep Mountain Anticline ACECWyoming · 13,316 acres · at least 7 active mining claims, 5 grazing allotments covering part of it16miles
- Spanish Point Karst ACECWyoming · 11,463 acres · 15 grazing allotments covering part of it23miles
- Little Mountain ACECWyoming · 21,443 acres · 1 right of way, 6 grazing allotments covering part of it24miles
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 Brown/Howe Dinosaur 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