The valley-bottom wetlands of this area are important for migratory birds of the Pacific Flyway as they move between northern breeding grounds and wintering areas in the south. Flocks of swans, Canada Geese, coots, and dabbling ducks use the area for resting and feeding during migration. Many waterfowl species also breed in the area. Cavities in mature cottonwood trees on levees are used by Bufflehead, Wood Duck, and Hooded Merganser. Both diurnal birds of prey and nocturnal owls are present.
Ospreys are important raptors of the Columbia Valley.
This unit is located approximately 10 kilometres downstream from the Brisco unit. Two major streams, the Spillimacheen River and Bugaboo Creek enter the Columbia River from the west here, partially traversing the unit. The vegetation of the wetlands here is similar to those found at Wilmer Marsh, but the adjacent treed uplands are vegetated by representatives of wet forests such as western hemlock, western red cedar, and western white pine. The understory is dense with ferns, thimbleberry, raspberry, and other related species. The unit's valley-bottom wetlands are important to migratory birds of the Pacific Flyway.