The Lower Green River Subwatershed contains a mix of industrial, commercial, and residential land uses with the levee-confined Green River flowing through it. A limited amount of agriculture also remains. The Lower Green River Subwatershed begins at rivermile 32 near Auburn and extends 21 miles to rivermile 11 in Tukwila. The diversions of the White river and the Cedar/Black River from the Green River have had a major effect on flows in the Lower Green. Diminished instream flow levels, limitation of off-channel refuge habitat and loss of sediment recruitment are key concerns. The Lower Green River Subwatershed is important for juvenile rearing but flood-control levees, water diversions, and urbanization have reduced the amount of habitat available to salmon in the subwatershed, particularly in terms of off-channel refuge habitats. Some spawning habitat exists in the upper portions of the mainstem above river mile 25. The subwatershed contains three major tributaries- Springbrook Creek, Mullen Slough, and Mill Creek - and a number of smaller creeks. Water quality in the tributaries is degraded, streams are channelized, and non-native plant species have invaded. Virtually the entire subwatershed is in the Urban Growth Area.