Arizona · Area of Critical Environmental Concern
Three Rivers Riparian
One of 3 areas BLM's Arizona office names Three Rivers Riparian; this one is 184 acres. All of them. BLM found a natural system, a wildlife resource and a scenic 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 two grazing allotments cover part of it. It covers 184 acres and was designated May 10, 2007, in the Lake Havasu RMP. In the plan's name, RMP stands for 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. The 2 grazing allotments below aren't marked.Grazing allotments
2 grazing allotments cover part of this line. Their permittees aren't named here yet.
- Alamo46,367acres
- Chino Springs18,619acres
The nearest areas
- Three Rivers RiparianArizona · 10,158 acres · at least 10 active mining claims and 1 more BLM lists as Filed, 1 right of way, 4 grazing allotments covering part of it6miles
- Three Rivers RiparianArizona · 31,589 acres · at least 48 active mining claims and 5 more BLM lists as Filed or Under Review, 3 rights of way, 9 grazing allotments covering part of it7miles
- Poachie Desert Tortoise HabitatArizona · 33,444 acres · at least 220 active mining claims and 25 more BLM lists as Filed, 5 rights of way, 7 grazing allotments covering part of it10miles
- Aubrey Peak Bighorn Sheep HabitatArizona · 2,457 acres · 2 grazing allotments covering part of it13miles
- McCracken Desert Tortoise HabitatArizona · 33,225 acres · at least 13 active mining claims, 1 right of way, 3 grazing allotments covering part of it19miles
Next to it
Three Rivers Riparian Area of Critical Environmental Concern touches the line.
More from BLM's Arizona office
Every area BLM's Arizona 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 Three Rivers Riparian. 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