Unit 40

The Owyhee Mountains and Silver City Range form the primary ridgeline system for navigation and glassing. Major summits include South Mountain, DeLamar Mountain, and Captain Butte, which serve as prominent reference points across open country. The Flatiron and Flatiron Ridge offer distinctive visual landmarks.

Numerous flat-topped features like Table Rock and Pleasant Valley Table provide excellent glassing platforms. Jump Creek Falls and the rim country around Murphy Rim and Coal Bank offer notable geographic anchors. Jordan Creek and Thomas Lakes represent the few permanent water bodies suitable for navigation reference.

These features are widely spaced across the vast landscape, requiring good map skills and attention to subtle terrain.

The unit spans dramatic elevation change from low river valleys around 2,200 feet to peaks exceeding 8,300 feet, creating distinct habitat transitions. Lower elevations feature sagebrush flats and alkaline draws typical of Great Basin terrain, while mid-elevations host scattered juniper woodlands mixed with sagebrush. Higher ridges and buttes support sparse conifer stands and mountain shrub habitat.

Vegetation is sparse throughout—this is open country without dense forest. The median elevation near 4,900 feet places most terrain in the sagebrush-juniper transition zone where sage grouse and pronghorn habitat dominates lower areas, with mule deer and occasionally elk using higher ridge systems.

Despite the vast size and remote character, Unit 40 has extensive road coverage with nearly 4,000 miles of roads throughout. County roads and two-track access radiates from Highway 78 and Highway 93, reaching into most drainages and valleys. This connectivity brings pressure potential despite isolation—hunters can establish camps and hunt systematically.

However, the area's size and sparse habitat (mostly open sagebrush) means pressure distributes across enormous acreage rather than concentrating. Early season sees moderate use near accessible reservoirs and valley bottoms. Late season pressure increases as hunters focus on remaining water sources.

Back-country access remains challenging and less crowded—the terrain complexity (7.3/10) rewards route-finding beyond obvious road corridors.

Unit 40 encompasses the western reaches of Owyhee County, bounded by the Snake River to the north and the Idaho-Oregon state line to the south. The unit stretches from the Salmon River drainage near U.S. Highway 93 eastward across the Owyhee plateau and mountains. Nearby towns include Grand View and Marsing to the northwest, with access primarily through Highway 78 and county roads.

The vast size combined with relatively few population centers in the immediate area defines the unit's character—remote high desert with pockets of habitable valley. Most hunting activity concentrates near road corridors and known water sources rather than throughout the full area.

Water is the limiting factor in Unit 40's arid environment. Perennial streams are few—Dougherty Creek, Pole Bridge Creek, and Jump Creek provide reliable water in their drainages. Scattered springs including Dougherty Springs, Sommercamp Spring, and Grasshopper Spring serve as critical navigation and hunting reference points.

Small reservoirs like Johnson Reservoir, Indian Battleground Reservoir, and Triangle Reservoir provide dependable water access but are widely scattered. The Snake and Salmon Rivers bound the unit but are less practical for day hunting. Understanding spring locations and seasonal water availability is essential—summer storms may temporarily increase ephemeral water sources, but dry seasons require advance planning and knowledge of reliable water.

Unit 40's sparse forest and extensive sagebrush flats make glassing and spotting the primary tactic. High vantage points like The Flatiron, table-top summits, and ridge systems allow hunters to cover vast territory with optics. Pronghorn are primary game in the open flats and basins; mule deer use ridge breaks and scattered juniper at higher elevations.

Sage grouse inhabit sagebrush areas, particularly near water. Early season offers opportunities on ridge transitions where deer move between elevations. Mid-season hunting focuses on water sources—the scattered springs and reservoirs become gathering points.

Late season concentrates animals where water persists. Success requires mobility, excellent glassing skills, and willingness to hunt open terrain without dense cover. Early morning and late afternoon offer best visibility on the expansive sagebrush canvas.