California · Area of Critical Environmental Concern
Los Osos
BLM found a natural system, a wildlife resource, a cultural value, a natural process and a historic value here, and its plan calls for special management. Nothing that BLM's records place sits inside the line today. It covers 4.7 acres and was designated December 22, 2014, in the Bakersfield 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
- Salinas RiverCalifornia · 2,347 acres · nothing placed inside16miles
- Cypress MountainCalifornia · 3,036 acres · nothing placed inside20miles
- Point SalCalifornia · 82 acres · nothing placed inside30miles
- Tierra RedondaCalifornia · 1,312 acres · nothing placed inside32miles
- Chico MartinezCalifornia · 4,614 acres · 2 grazing allotments covering part of it56miles
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 Los Osos. 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