Idaho · Area of Critical Environmental Concern
East Fork American River
BLM found a natural system, a wildlife resource, a natural process and a fish resource here, and its plan calls for special management. BLM's records place no claim, lease or right of way inside the line today, and two grazing allotments cover part of it. It covers 569 acres and was designated December 21, 2009, in the Cottonwood RMP 2009. 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. The 2 grazing allotments below aren't marked.Grazing allotments
2 grazing allotments cover part of this line. Their permittees aren't named here yet.
- Allotment USFS-GRZ-10033.01027717,943acres
- American River484acres
The nearest areas
- American River Historic Sites DistrictIdaho · 6,347 acres · at least 98 active mining claims and 79 more BLM lists as Filed, 24 rights of way, 5 grazing allotments covering part of it3miles
- Upper Lolo CreekIdaho · 1,626 acres · 8 rights of way, 5 grazing allotments covering part of it36miles
- Skookumchuck RNAIdaho · 8.7 acres · a grazing allotment covering part of it44miles
- Long Gulch RNAIdaho · 47 acres · a grazing allotment covering part of it45miles
- Lower Lolo CreekIdaho · 3,679 acres · 5 grazing allotments covering part of it46miles
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 East Fork American River. 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