Ridgefield NWR has a total of 5,150 acres (20.8 km²) of marshes, grasslands and woodlands. Preservation of the natural Columbia Riverfloodplain is the management objective of the Carty, 2 mile (3 km) self guided hiking trail, Roth and Ridgeport Dairy units. The River 'S', 4.2 mile (7 km) auto tour route and 1.2 mile (2 km) seasonal hiking trail, and Bachelor Island units are managed to maximize habitat for waterfowl and other wetland wildlife.
The refuge was established (along with 3 other refuges in the Willamette Valley of Oregon) in 1965, in response to a need to establish vital winter habitat for wintering waterfowl with an emphasis on the dusky Canada goose whose nesting areas in Alaska were severely impacted by the violent earthquake of 1964.