California · Area of Critical Environmental Concern
Knoxville
BLM found a natural system, a wildlife resource, a cultural value and a natural process here, and its plan calls for special management. BLM's records place 5 rights of way inside the line today, and a grazing allotment covers part of it. It covers 4,263 acres and was designated September 25, 2006, in the Ukiah.
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
5 rights of way sit inside the line. BLM files 4 under non-energy facilities and 1 under fiber optic facilities.
- AT&T LEASE ADMINISTRATION1right of way
- UKIAH FIELD OFFICE1right of way
- NAPA COUNTY (California)1right of way
- USGS1right of way
- HOMESTAKE MINING CO1right of way
The geothermal leases
No active geothermal lease sits inside the line.
Not counted: 1 more lease BLM lists as Closed.
Grazing allotments
A grazing allotment covers part of this line. Its permittee isn't named here yet.
- Jericho Valley4,433acres
The nearest areas
- Cache Creek CorridorCalifornia · 19,764 acres · nothing placed inside8miles
- Cedar RoughsCalifornia · 6,379 acres · a grazing allotment covering part of it17miles
- Walker RidgeCalifornia · 3,433 acres · 2 rights of way22miles
- Black ForestCalifornia · 254 acres · nothing placed inside23miles
- Indian ValleyCalifornia · 101 acres · nothing placed inside26miles
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 Knoxville. 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