Memorandum of Understanding (MOU) between U.S. Bureau of Reclamation and Ecology signed in 2022.

This is a rulemaking announcement (CR-101) to update the recreational use criteria in WAC 173-201A Water Quality Standards for Surface Waters of the State of Washington

This document describes the errors and their corrections found in the fin-fish hatching and rearing permit

Ecology's response to Petition to Amend the Instream Flow Rule for the Spokane River & Spokane Valley Rathdrum Prairie (SVRP) Aquifer, WAC 173-557 Water Resources Management Program (WRMP) for the Spokane River and Spokane Valley Rathdrum Prairie (SVRP) Aquifer and amendment to WAC 173-555-010.

Order on Petition for Declaratory Judgment Regarding the Validity of an Agency Rule, and Petition for Judicial Review of Agency Action Denying Petition to Amend Agency Rule regarding rulemaking for WAC 173-557 and 173-555 Water Resources Management Program (WRMP) for the Spokane River and Spokane Valley Rathdrum Prairie (SVRP) Aquifer and amendment to WAC 173-555-010.

Compilation of Geologic, Hydrologic, and Ground-Water Flow Modeling Information for the Spokane Valley—Rathdrum Prairie Aquifer, Spokane County, Washington, and Bonner and Kootenai Counties, Idaho, United States Geological Survey, WAC 173-557; 173-555 Water Resources Management Program (WRMP) for the Spokane River and Spokane Valley Rathdrum Prairie (SVRP) Aquifer and amendment to WAC 173-555-010.

Ecology SVRPA Project Technical Memorandum: Data Report, 2005 “6 minute” Study, Spokane Valley Rathdrum Prairie Aquifer Area, Ecology Memorandum, December 13, 2005 WAC 173-557; 173-555 Water Resources Management Program (WRMP) for the Spokane River and Spokane Valley Rathdrum Prairie (SVRP) Aquifer and amendment to WAC 173-555-010.

Final Technical Report, Spokane River Instream Flow Studies, EES Consulting, May 2007 WAC 173-557; 173-555 Water Resources Management Program (WRMP) for the Spokane River and Spokane Valley Rathdrum Prairie (SVRP) Aquifer and amendment to WAC 173-555-010.

Gravity Acquisition and Depth to Basement Modeling of the Spokane Valley and Rathdrum Prairie Aquifer, Northeastern Washington and Northwestern Idaho, John S. Oldow and Kenneth F. Sprenke, Idaho Department of Water Resources, WA Ecology, October 31, 2006 WAC 173-557; 173-555 rulemaking.

Ground-Water Flow Model for the Spokane valley-Rathdrum Prairie Aquifer, Spokane County, Washington, and Bonner and Kootenai Counties, Idaho, United States Geological Survey, Scientific Investigations Report 2007–5044 WAC 173-557; 173-555 Water Resources Management Program (WRMP) for the Spokane River and Spokane Valley Rathdrum Prairie (SVRP) Aquifer and amendment to WAC 173-555-010.

Hydrogeologic Framework and Ground-Water Budget of the Spokane Valley-Rathdrum Prairie Aquifer, Spokane County, Washington, and Bonner and Kootenai Counties, United States Geological Survey, Scientific Investigations Report 2007 WAC 173-557; 173-555 Water Resources Management Program (WRMP) for the Spokane River and Spokane Valley Rathdrum Prairie (SVRP) Aquifer and amendment to WAC 173-555-010.

Instream Flow and Fish Habitat Assessment, FERC Project No. 2545, Avista Corporation, Northwest Hydraulic Consultants and Hardin-Davis, Inc, June 2004 WAC 173-557; 173-555 Water Resources Management Program (WRMP) for the Spokane River and Spokane Valley Rathdrum Prairie (SVRP) Aquifer and amendment to WAC 173-555-010.

Instream Flow Recommendations Memorandum for WRIA Planning Units 54 and 55/57, WRIA 54/57 Spokane River Instream Flow Workgroup Memorandum, June 9, 2008 WAC 173-557; 173-555 Water Resources Management Program (WRMP) for the Spokane River and Spokane Valley Rathdrum Prairie (SVRP) Aquifer and amendment to WAC 173-555-010.

Lower Spokane River Redband Trout Spawning Habitat: Monroe Street Dam to Nine Mile Dam Pool, Spokane River Hydroelectric Project, FERC Project No. 2545, Dr. R. Craig Addley and Mr. N. Phil Peterson, February 2011 WAC 173-557; 173-555 Water Resources Management Program (WRMP) for the Spokane River and Spokane Valley Rathdrum Prairie (SVRP) Aquifer and amendment to WAC 173-555-010.

If you use water from a well, stream, or lake, adjudication affects you