Spokane River snippet

Spokane dissolved oxygen TMDL

Spokane River Dissolved Oxygen Water Quality Improvement Project
Total Maximum Daily Load (TMDL)

The Spokane River flows from its source at Lake Coeur d’Alene, Idaho to the city of Spokane, Washington. It then flows northwesterly through Lake Spokane and the Spokane Tribe of Indian’s reservation to its confluence with the Franklin D. Roosevelt Lake impoundment of the Columbia River. The river drains an area of about 6,640 square miles in two states. Approximately 2,295 square miles are within Washington with the remainder of the watershed in Idaho.

When excessive algae blooms and violations of water quality standards for dissolved oxygen (DO) and phosphorus continued to occur in Lake Spokane, several segments of the Spokane River were included on the Department of Ecology’s 1996, 1998 and 2004 303(d) lists of impaired water bodies.  The Clean Water Act requires water bodies listed on the state's 303(d) list to have a TMDL developed.  This site provides information on the DO water quality improvement project for the Spokane River.