California · Area of Critical Environmental Concern
Brisbane Valley Monkey Flower
BLM found a natural system, a wildlife resource and a natural process here, and its plan calls for special management. BLM's records place at least 38 active mining claims (and 6 more BLM lists as Filed) and 1 right of way inside the line today, and a grazing allotment covers part of it. It covers 17,981 acres and was designated September 14, 2016, in the CDCA Plan, as amended by DRECP. In the plan's name, CDCA stands for California Desert Conservation Area and DRECP for Desert Renewable Energy Conservation 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 44 claims sit inside this line: 38 active and 6 filed and pending, 35 with a holder BLM names and 9 with a claimant BLM withholds under the Privacy Act. BLM lists 38 as Active and 6 as Filed.
- CEMEX CALIFORNIA CEMENT LLC20claims
- CALPORTLAND CO14claims
- Names withheld by BLM (private individuals)9claims
- HI DESERT GOLD DIGGERS INC1claim
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.
- SOUTHWESTERN PORTLAND CEMENT1right of way
Grazing allotments
A grazing allotment covers part of this line. Its permittee isn't named here yet.
- Stoddard Mountain160,783acres
The nearest areas
- Mojave Fishhook CactusCalifornia · 637 acres · 5 rights of way, a grazing allotment covering part of it4miles
- Northen Lucerne Wildlife LinkageCalifornia · 42,452 acres · at least 57 active mining claims and 201 more BLM lists as Filed, 7 rights of way, a grazing allotment covering part of it12miles
- Bendire's ThrasherCalifornia · 9,780 acres · at least 1 active mining claim and 71 more BLM lists as Filed16miles
- Granite Mountain CorridorCalifornia · 60,175 acres · at least 21 active mining claims and 3 more BLM lists as Filed or Under Review, 17 rights of way, 2 grazing allotments covering part of it20miles
- Juniper FlatsCalifornia · 2,387 acres · a grazing allotment covering part of it21miles
Next to it
Mojave Fishhook Cactus Area of Critical Environmental Concern touches the line.
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 Brisbane Valley Monkey Flower. 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