Idaho · Area of Critical Environmental Concern
Thousand Springs RNA
BLM found a natural system, a wildlife resource and a natural process here, and its plan calls for special management. Nothing that BLM's records place sits inside the line today. It covers 233 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
Ground: USGS The National Map, topographic tiles. Boundaries: BLM's own, read Oct 20, 2026.Inside the line
Nothing sits inside this line that BLM's records place: no mining claim, lease, right of way or grazing allotment.
The nearest areas
- Thousand SpringsIdaho · 907 acres · 1 right of way, a grazing allotment covering part of it3miles
- Peck's Canyon RNAIdaho · 782 acres · a grazing allotment covering part of it6miles
- Herd Creek Watershed RNAIdaho · 1,056 acres · 2 grazing allotments covering part of it11miles
- Antelope Flat RNAIdaho · 588 acres · 2 grazing allotments covering part of it11miles
- Herd Creek WatershedIdaho · 16,887 acres · 3 rights of way, 4 grazing allotments covering part of it13miles
Next to it
Thousand Springs Area of Critical Environmental Concern touches the line.
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 Thousand Springs RNA. 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