WAC 173-563-040. Establishment of instream flows for instream uses

(1) In order to protect the quality of the natural environment and provide for preservation of wildlife, fish, scenic, aesthetic and other environmental values, and navigational values, minimum instantaneous flows and minimum average weekly flows are established for instream uses at the following project locations on the main stem Columbia River in Washington state: CONTROL STATION RIVER MILE MANAGEMENT UNIT The Dalles Dam 191.5 John Day Dam to Bonneville Dam (Lake Bonneville and Celilo Lake) (River Mile 146.1-215.6) John Day Dam 215.6 John Day Dam to McNary Dam (Umatilla Lake) (River Mile 215.6-292.0) McNary Dam 292.0 McNary Dam to Priest Rapids Dam (Lake Wallula and the Hanford Reach) (River Mile 292.0-397.1) Priest Rapids Dam and upstream (Wanapum, Rock Island, Rocky Reach, Wells, Chief Joseph, and Grand Coulee Dam) 397.1+ Priest Rapids Dam upstream to Canadian Border (River Mile 397.1-745.0) CONTROL STATION RIVER MILE MANAGEMENT UNIT The Dalles Dam 191.5 John Day Dam to Bonneville Dam (Lake Bonneville and Celilo Lake) (River Mile 146.1-215.6) John Day Dam 215.6 John Day Dam to McNary Dam (Umatilla Lake) (River Mile 215.6-292.0) McNary Dam 292.0 McNary Dam to Priest Rapids Dam (Lake Wallula and the Hanford Reach) (River Mile 292.0-397.1) Priest Rapids Dam and upstream (Wanapum, Rock Island, Rocky Reach, Wells, Chief Joseph, and Grand Coulee Dam) 397.1+ Priest Rapids Dam upstream to Canadian Border (River Mile 397.1-745.0) (2) Minimum instantaneous flows at the locations listed in WAC 173-563-040(1) are established for instream uses as follows: MINIMUM INSTANTANEOUS FLOWS - COLUMBIA RIVER PROJECTS (1,000 cubic feet/second) Chief* Joseph Wells & Rocky Reach Rock Island & Wanapum* Priest Rapids McNary & John Day The Dalles Jan 10 10 50 20 20 Feb 10 10 50 20 20 Mar 10 10 50 50 50 Apr 1-15 20 20 50 50 70 16-25 20 30 50 70 70 26-30 20 50 50 70 70 May 20 50 50 70 70 June 1-15 20 50 50 70 70 1 6-30 10 20 50 50 50 Jul 1-15 10 20 50 50 50 16-31 10 50 50 50 50 Aug 10 50 50 50 50 Sep 10 20 36 50 50 Oct 1-15 10 20 36 50 50 16-31 10 20 50 50 50 Nov 10 10 50 50 50 Dec 10 10 50 20 20 * As provided in WAC 173-563-050 (1), the minimum instantaneous flows set forth in this subsection are subject to a reduction of up to twenty-five percent during low flow years, except that in no case shall the outflow from Priest Rapids Dam be less than 36,000 cfs. For the reach from Grand Coulee through Wanapum, minimum instantaneous flows shall be as shown above, or as necessary to maintain minimum flows (subject to low runoff adjustment) at Priest Rapids, whichever is higher. Chief* Joseph Wells & Rocky Reach Rock Island & Wanapum* Priest Rapids McNary & John Day The Dalles Jan 10 10 50 20 20 Feb 10 10 50 20 20 Mar 10 10 50 50 50 Apr 1-15 20 20 50 50 70 16-25 20 30 50 70 70 26-30 20 50 50 70 70 May 20 50 50 70 70 June 1-15 20 50 50 70 70 1 6-30 10 20 50 50 50 Jul 1-15 10 20 50 50 50 16-31 10 50 50 50 50 Aug 10 50 50 50 50 Sep 10 20 36 50 50 Oct 1-15 10 20 36 50 50 16-31 10 20 50 50 50 Nov 10 10 50 50 50 Dec 10 10 50 20 20 * As provided in WAC 173-563-050 (1), the minimum instantaneous flows set forth in this subsection are subject to a reduction of up to twenty-five percent during low flow years, except that in no case shall the outflow from Priest Rapids Dam be less than 36,000 cfs. For the reach from Grand Coulee through Wanapum, minimum instantaneous flows shall be as shown above, or as necessary to maintain minimum flows (subject to low runoff adjustment) at Priest Rapids, whichever is higher. (3) Minimum average weekly flows for instream uses are established at the locations listed in WAC 173-563-040(1) as follows: MINIMUM AVERAGE WEEKLY FLOWS - COLUMBIA RIVER PROJECTS (1,000 cubic feet/second) Chief Joseph* Wells & Rocky Reach* Rock Island & Wanapum* Priest Rapids McNary John Day The Dalles Jan 30 30 30 70 60 60 60 Feb 30 30 30 70 60 60 60 Mar 30 30 30 70 60 60 60 Apr 1-15 50 50 60 70 100 100 120 16-25 60 60 60 70 150 150 160 26-30 90 100 110 110 200 200 200 May 100 115 130 130 220 220 220 Jun 1-15 80 110 110 110 200 200 200 16-30 60 80 80 80 120 120 120 Jul 1-15 60 80 80 80 120 120 120 16-31 90 100 110 110 140 140 140 Aug 85 90 95 95 120 120 120 Sep 40 40 40 40 60 85 90 Oct 1-15 30 35 40 40 60 85 90 16-31 30 35 40 70 60 85 90 Nov 30 30 30 70 60 60 60 Dec 30 30 30 70 60 60 60 * For the reach from Grand Coulee through Wanapum, minimum average weekly flows shall be as shown above, or as necessary to maintain minimum flows (subject to low runoff adjustment) at Priest Rapids, whichever is higher. As provided in WAC 173-563-050 (1), the minimum average weekly flows set forth in this subsection are subject to a reduction of up to twenty-five percent during low flow years, except that in no case shall the outflow from Priest Rapids Dam be less than 36,000 cfs. Chief Joseph* Wells & Rocky Reach* Rock Island & Wanapum* Priest Rapids McNary John Day The Dalles Jan 30 30 30 70 60 60 60 Feb 30 30 30 70 60 60 60 Mar 30 30 30 70 60 60 60 Apr 1-15 50 50 60 70 100 100 120 16-25 60 60 60 70 150 150 160 26-30 90 100 110 110 200 200 200 May 100 115 130 130 220 220 220 Jun 1-15 80 110 110 110 200 200 200 16-30 60 80 80 80 120 120 120 Jul 1-15 60 80 80 80 120 120 120 16-31 90 100 110 110 140 140 140 Aug 85 90 95 95 120 120 120 Sep 40 40 40 40 60 85 90 Oct 1-15 30 35 40 40 60 85 90 16-31 30 35 40 70 60 85 90 Nov 30 30 30 70 60 60 60 Dec 30 30 30 70 60 60 60 * For the reach from Grand Coulee through Wanapum, minimum average weekly flows shall be as shown above, or as necessary to maintain minimum flows (subject to low runoff adjustment) at Priest Rapids, whichever is higher. As provided in WAC 173-563-050 (1), the minimum average weekly flows set forth in this subsection are subject to a reduction of up to twenty-five percent during low flow years, except that in no case shall the outflow from Priest Rapids Dam be less than 36,000 cfs.