Idaho · Area of Critical Environmental Concern
Lone Bird
BLM found a natural system and a cultural value here, and its plan calls for special management. BLM's records place at least 3 active mining claims and 1 right of way inside the line today, and three grazing allotments cover part of it. It covers 9,970 acres and was designated July 29, 1999, in the Challis RMP 1999. In the plan's name, RMP stands for 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
Who holds the claims
At least 3 claims sit inside this line: 3 active, 3 with a claimant BLM withholds under the Privacy Act. BLM lists 3 as Active.
- Names withheld by BLM (private individuals)3claims
BLM's mining rules list designated ACECs among the places where mining that disturbs the surface beyond casual use needs a plan of operations BLM approves. Exploration of five acres or less can go ahead on a notice instead.
The rights of way
1 right of way sits inside the line. BLM files 1 under non-energy facilities.
- IDAHO DEPARTMENT OF TRANSPORTATION1right of way
Grazing allotments
3 grazing allotments cover part of this line. Their permittees aren't named here yet.
- Mountain Springs98,441acres
- Warm Springs64,875acres
- Bradbury Flat15,694acres
The nearest areas
- Malm Gulch/Germer BasinIdaho · 5,415 acres · 2 grazing allotments covering part of it5miles
- Antelope Flat RNAIdaho · 588 acres · 2 grazing allotments covering part of it6miles
- Malm Gulch/Germer Basin RNAIdaho · 2,409 acres · a grazing allotment covering part of it7miles
- Birch CreekIdaho · 8,648 acres · at least 4 mining claims BLM lists as Filed, 6 rights of way, 2 grazing allotments covering part of it9miles
- Sand Hollow RNAIdaho · 3,332 acres · a grazing allotment covering part of it11miles
More from BLM's Idaho office
Every area BLM's Idaho 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 Lone Bird. 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