Unit 41, Arizona

Predominantly flat Sonoran Desert lowlands broken by several rough, rocky mountain ranges that rise abruptly from the desert floor. Named ranges within or adjacent to the unit include the Eagletail Mountains, Palomas Mountains, Tank Mountains, Little Horn Mountains, Saddle Mountain, North Gila Mountains, and Muggins Mountains. Elevation ranges from approximately 400 ft in the agricultural valleys and river bottoms to around 3,000 ft on the highest desert peaks. Agricultural valleys (Harquahala, Wellton-Mohawk, Hyder) occupy the lower benches. The Gila River drainage runs along the southern boundary area. Much of the mountain terrain is strenuous and physically demanding.

The unit is bounded by I-8 and US Hwy 95 in Yuma on the southwest, running east along I-8 to the Agua Caliente area, then north along Agua Caliente Rd and Hyder Rd to the I-10 corridor (Tonopah/Salome area), and back south via AZ Hwy 85 to I-8. Approximately 77% of the unit is publicly accessible, managed primarily by the BLM Yuma Field Office. Key access roads include Interstate 8, Interstate 10, Harquahala Valley Road, Hovatter Road, Dateland Road, Agua Caliente-Sentinel Road, and the BLM Clanton Hills Road (Dateland-Palomas-Harquahala Rd) — the main north-south spine dividing Unit 41 East from Unit 41 West. The AT&T Frontage Road and El Paso Gas Pipeline Road provide cross-unit access in the eastern portion. The Kofa National Wildlife Refuge borders portions of the eastern unit. The Eagletail Mountains Wilderness and Muggins Mountains Wilderness prohibit motorized vehicle access. The Yuma Proving Ground (YPG) military reservation covers portions of Unit 41 West including the Tank Mountains area; hunters must obtain a free YPG Hunting Access Permit via iSportsman (yuma.isportsman.net) and coordinate with YPG Range Control — background checks take 2–3 business days, all firearms/bows must be registered at the visitor center or through iSportsman. Some low-elevation land is private agricultural ground. Camping is permitted dispersed on BLM and state land. Services are available in Gila Bend, Wellton, and Yuma. The Quigley-Achee Wildlife Area is located within Unit 41 (no open fires, no overnight camping, motorized vehicles prohibited in crop production areas).

Lower desert flats and alluvial fans support classic lower Sonoran Desert vegetation: creosote, ironwood, paloverde, cholla, and saguaro cactus. Rocky mountain slopes feature creosote-palo verde associations with sparse desert scrub. Riparian corridors follow the Gila River and larger desert washes with denser vegetation. The unit is entirely desert scrub and Sonoran Desert habitat with no ponderosa pine or high-elevation conifer. Agricultural lands in the Wellton-Mohawk, Hyder, and Harquahala valleys provide forage for deer and dove during dry years.

Desert bighorn sheep are the signature species, with the population divided into the 41 East (Eagletail Mountains core) and 41 West sub-populations monitored by helicopter survey every three years. Mule deer occur at low densities, concentrated in desert riparian drainages, agricultural valleys during drought years, and the Eagletail Mountains. Javelina are present throughout the unit's shrub desert and are huntable on a nonpermit tag year-round. Sonoran pronghorn antelope occupy portions of southwestern Arizona with no open hunting season in Unit 41. Mourning dove, whitewing dove, and Eurasian collared dove are present with good concentrations in the Wellton-Mohawk, Hyder, and Harquahala valleys. Gambel's quail numbers fluctuate with precipitation. Coyote, bobcat, and other predators and furbearers are present. No elk or turkey habitat exists in this low-desert unit.