The McDonald Bridge unit covers 121.3 acres located one mile east of Lowden on the Walla Walla River in Walla Walla County. When steelhead are migrating, the two total miles of river frontage provide fishing recreation. Cottonwood, willow, alder and red-osier dogwood are the dominant woody species with reed canary grass being the primary understory species. One site is being restored to native grass cover and another is still being actively farmed to small grains under an agricultural lease. Hunting for upland birds, turkeys, waterfowl and deer is popular.