California · Area of Critical Environmental Concern
Cosumnes River
BLM found a natural system, a wildlife resource and a natural process here, and its plan calls for special management. BLM's records place 1 right of way inside the line today. It covers 2,033 acres and was designated February 1, 2008, in the Sierra.
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
1 right of way sits inside the line. BLM files 1 under non-energy facilities.
- MOTHER LODE FIELD OFFICE1right of way
The nearest areas
- Ione ManzanitaCalifornia · 274 acres · nothing placed inside26miles
- Ione Tertiary Oxisol SoilCalifornia · 92 acres · nothing placed inside29miles
- Pine HillCalifornia · 3,277 acres · at least 3 active mining claims, 1 right of way39miles
- North Fork Cosumnes RiverCalifornia · 1,136 acres · at least 1 active mining claim, 1 right of way44miles
- Cedar RoughsCalifornia · 6,379 acres · a grazing allotment covering part of it52miles
More from BLM's California office
Every area BLM's California 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 Cosumnes 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