Unit 203, Nevada

Two broad, flat-bottomed basins connected by Wilson Canyon (carved by the West Walker River through volcanic Singatse Range rock); valley floors lie at approximately 4,300–4,800 ft (Mason Valley ~4,344 ft; Smith Valley ~4,731–4,797 ft). The unit rises steeply into surrounding ranges, reaching an estimated 7,300 ft at Cleaver Peak. Secondary hills and dry desert foothills ring the valleys. Terrain on valley floors is gentle with grades generally under 5%; foothills and canyons become rocky and moderately steep.

Primary highways: Nevada SR-208 connects the region — running northeast through Wilson Canyon to Yerington (23 miles from Smith Valley) and west to US-395 (15 miles); SR-338 extends south from Smith Valley toward the California border. Wilson Canyon, 13 miles west of Yerington along SR-208, provides BLM access via Copperbelt Road (graded dirt, high-clearance) into the canyon bottom along the West Walker River. Public land manager: BLM Carson City District (Sierra Front Field Office) administers the foothill BLM lands; valley floors are predominantly private. Key public hunting areas: (1) Mason Valley Wildlife Management Area (MVWMA) — 15,480+ acres of NDOW-managed wetland and upland habitat at the north end of Mason Valley; hunters check in/out at the main entrance and park in designated lots — no vehicles on area during season; (2) Lahontan State Recreation Area (LSRA) offers supplemental public access. Special regulation (NAC 503.170): within fenced and cultivated lands of Mason and Smith Valleys and on the MVWMA, hunters must use shotgun (rifled slugs/sabots, 10–20 gauge) or bow and arrow only — rifles and pistols are prohibited. NDOW also recommends hunters wear high-visibility clothing in dense riparian cover. A land-status map or GPS is essential given the complex public/private patchwork. Seasonal road conditions can restrict access after winter storms.

Valley floors: irrigated alfalfa/hay fields and meadows, with riparian corridors of cottonwood, willows, and brush along the Walker River and its tributaries. Foothill east slopes (Singatse Range): desert shrubland dominated by sagebrush, spiny hopsage, and shadscale, with cheatgrass understory. Foothill west slopes (Pine Nut Mountains): pinyon-juniper woodland with sagebrush understory. Active pinyon-juniper removal projects in the Buckskin Valley area (north end of unit) have opened habitat, benefiting sage grouse and antelope alike. The unit is not a classic high-elevation mule deer unit; deer concentrate primarily in agricultural and riparian lands.

Mule deer are the primary big-game species, resident year-round in the agricultural valleys and riparian corridors of Mason and Smith Valleys; deer concentrate in irrigated fields, dense riparian cover along the Walker River, and the Carson River near Weeks. The population is not surveyed aerially — it is managed by harvest metrics; NDOW considers it static with potential to grow under favorable habitat conditions. The 2023 ALW hunter success rate was 33%; the 2025 ALW rate was 54%. Pronghorn occupy the sagebrush and open foothill habitat, particularly in the Pine Nut Mountains; the population (shared with Unit 291) is gradually expanding into post-fire habitat opened by the 2021 Tamarack Fire and pinyon-juniper removal projects on the southwestern Pine Nut slopes. As of the October 2023 aerial survey, 152 pronghorn were classified at 54 bucks:100 does:33 fawns — NDOW considers this population stable. California quail, Gambel's quail, and cottontail rabbits are present and huntable at the MVWMA. Desert bighorn sheep occupy the Wassuk Range in adjacent Unit 202 and the East Walker River corridor (Unit 204) but are not in Unit 203 proper. Waterfowl use the Walker River floodplain and MVWMA wetlands. Mountain lion and black bear are present in the surrounding ranges at low densities.