GMU 278 - Wahluke, Washington

Broad, south-facing gravel slope (approx. 8% grade) formed by Glacial Lake Missoula floods, spanning 847 square miles across Grant, Benton, Adams, Franklin, Kittitas, and Yakima counties. Elevation ranges from roughly 450 ft along the Columbia River bottomlands to 2,500 ft in the Saddle Mountains on the unit''s northern edge. The Saddle Mountains form the dominant ridge feature with Saddle Mountain Road running along the rim. The unit''s interior is characterized by rolling shrub-steppe plateau, cuts, small coulees, and the Lower Crab Creek drainage — a pothole-studded riparian valley that flows west into the Columbia. Terrain is relatively flat and open, with modest road network providing reasonable access.

Approximately 16% of the unit is public land (roughly 86,000 acres of the 542,000-acre unit), though the most huntable concentration is the ~36,000 acres of the Columbia Basin Wildlife Area Complex managed primarily by U.S. Bureau of Reclamation with WDFW access agreements. The Saddle Mountain National Wildlife Refuge (U.S. Fish & Wildlife Service) is closed to hunting. The Wahluke Slope itself contains extensive private agricultural land including nearly 10,000 acres of vineyards. Washington State Route 24 bisects the unit east-west. Saddle Mountain Road provides rim access from the north. Lower Crab Creek and Priest Rapids Wildlife Area segments offer additional public hunting ground. The 84% private land dominance makes scouting property boundaries and obtaining landowner permission critical.

Classic Columbia Basin shrub-steppe: big sagebrush, bitterbrush, rabbitbrush, and native bunchgrasses dominate uplands. Riparian corridors along Crab Creek support cottonwood, willow, and dense shrub. The unit has been impacted by range fires that have reduced sage habitat in some areas, slowing recovery of critical deer cover. South-facing Wahluke Slope aspects produce early green-up in spring. Agricultural conversion — dryland wheat, irrigated row crops, and vineyards — occupies most private land. Pothole wetlands along Lower Crab Creek attract waterfowl and provide additional deer and upland bird habitat.

Mule deer in GMU 278 are notably non-migratory — one of only two units in the Ephrata District (along with GMU 290 Desert) where mule deer remain resident year-round rather than making seasonal migrations. Deer concentrate in cuts, coulees, and Crab Creek riparian areas during warmer months and disperse across shrub-steppe flats in late fall. Crab Creek corridor holds deer, upland game, and waterfowl and functions as the primary wildlife movement corridor. Elk are extremely rare — only ~10 elk total harvested in the unit since 2000 — and should not be a primary target species. White-tailed deer occur in small isolated groups in riparian corridors, most commonly along Crab Creek.

GMU 278 is a general-season unit — no limited-entry draw tags are required for deer, elk, or bear under standard regulations. Washington uses a pure random draw with no bonus point system for special permits, but GMU 278 does not appear in the limited-entry or special permit unit lists. Average deer harvest since 2001 has been approximately 35 deer per year (only 26 harvested in 2009), making this a low-pressure, low-harvest unit. HuntScore 2021 data shows 396 total hunters and 86 total harvests for a 21.7% success rate across all methods. Mule deer bucks are subject to a 3-point minimum antler restriction (eastern WA rule for all 100/200/300-series GMUs). Hunting pressure from upland bird hunters using the same public land creates additional congestion during overlap periods. Recent wildfires have degraded some sage habitat. The Saddle Mountain NWR portion of the unit is closed to all hunting — GPS and boundary awareness are essential. Approximately 2 hospitals, 3 hotels, and 29 campgrounds within 20 miles.