Nevada · Area of Critical Environmental Concern
Massacre Rim
BLM found a wildlife resource, a cultural value and a historic value here, and its plan calls for special management. BLM's records place no claim, lease or right of way inside the line today, and six grazing allotments cover part of it. It covers 48,423 acres in Nevada, managed by BLM's California office, and was designated April 17, 2008, in the Surprise.
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 6 grazing allotments below aren't marked.Grazing allotments
6 grazing allotments cover part of this line. Their permittees aren't named here yet.
- Nut Mountain71,333acres
- Massacre Lakes47,115acres
- Horse Lake29,857acres
- Bitner28,941acres
- Little Basin25,837acres
- Board Corral16,598acres
The nearest areas
- BitnerCalifornia · 1,924 acres · 2 rights of way, a grazing allotment covering part of it9miles
- Rahilly-GravellyCalifornia · 956 acres · 2 grazing allotments covering part of it22miles
- High Rock CanyonNevada · 5,665 acres · 2 rights of way, 3 grazing allotments covering part of it25miles
- Spanish LakeOregon/Washington · 4,695 acres · 4 grazing allotments covering part of it26miles
- Rahilly-GravellyOregon/Washington · 18,718 acres · 4 grazing allotments covering part of it28miles
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 Massacre Rim. 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