Arizona · Area of Critical Environmental Concern
Three Rivers Riparian
One of 3 areas BLM's Arizona office names Three Rivers Riparian; this one is 31,589 acres. All of them. BLM found a natural system, a wildlife resource, a scenic value, a natural process and a fish resource here, and its plan calls for special management. BLM's records place at least 48 active mining claims (and 5 more BLM lists as Filed or Under Review) and 3 rights of way inside the line today, and nine grazing allotments cover part of it. It covers 31,589 acres and was designated March 7, 1995, in the Kingman 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
Who holds the claims
At least 53 claims sit inside this line: 48 active and 5 filed and pending, 49 with a holder BLM names and 4 with a claimant BLM withholds under the Privacy Act. BLM lists 48 as Active, 4 as Filed and 1 as Under Review.
- URANIUM ENERGY CORP49claims
- Names withheld by BLM (private individuals)4claims
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
3 rights of way sit inside the line. BLM files 3 under non-energy facilities.
- Holder not listed by BLM2rights of way
- USGS TEMPE FIELD OFFICE1right of way
Grazing allotments
9 grazing allotments cover part of this line. Their permittees aren't named here yet.
- Chicken Springs136,438acres
- Artillery Range73,455acres
- Santa Maria Community61,772acres
- Palmerita Ranch52,898acres
- Alamo46,367acres
- Santa Maria Ranch45,079acres
- Tres Alamos Ranch39,298acres
- Greenwood Community22,971acres
- D O R2,682acres
The nearest areas
- Three Rivers RiparianArizona · 184 acres · 2 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 it9miles
- 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 it12miles
- Clay Hills Research Natural AreaArizona · 1,117 acres · at least 17 active mining claims, a grazing allotment covering part of it17miles
- Aubrey Peak Bighorn Sheep HabitatArizona · 2,457 acres · 2 grazing allotments covering part of it20miles
Next to it
Poachie Desert Tortoise Habitat 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