WAC 173-507-020. Establishment of instream flows

(1) Instream flows are established for stream management units with monitoring to take place at certain control stations as follows: STREAM MANAGEMENT UNIT INFORMATION Control Station No. Stream Management Unit Name Control Station by River Mile and Section, Township and Range Affected Stream Reach Including Tributaries 12.1330.00 So. Fk. Skykomish River 51.6 28-27-10E From confluence with N. Fk. Skykomish River to headwaters. 12.1381.50 Sultan River 5.1 17-28-8E From mouth to headwaters. 12.1411.00 Skykomish River 25.0 12-27-6E From mouth to headwaters, excluding So. Fk. Skykomish River and Sultan River. 12.1430.00 No. Fk. Snoqualmie 2.2 26-24-8E From mouth to headwaters. 12.1445.00 Snoqualmie River 40.0 19-24-8E From Snoqualmie Falls to headwaters, excluding No. Fork Snoqualmie River. 12.1485.00 Tolt River 8.7 31-26-8E From mouth to headwaters. 12.1490.00 Snoqualmie River 23.0 9-25-7E From confluence with Harris Creek to Snoqualmie Falls, excluding Tolt River. 12. Snoqualmie River 2.5 26-27-6E From mouth to confluence with Harris Creek, including Harris Creek. 12.1554.00 Pilchuck River 1.9 18-28-6E From mouth to headwaters. 12.1508.00 Snohomish River 20.4 16-27-6E From influence of mean annual high tide at low base flow levels to confluence with Skykomish River and Snoqualmie River, excluding Pilchuck River. STREAM MANAGEMENT UNIT INFORMATION Control Station No. Stream Management Unit Name Control Station by River Mile and Section, Township and Range Affected Stream Reach Including Tributaries 12.1330.00 So. Fk. Skykomish River 51.6 28-27-10E From confluence with N. Fk. Skykomish River to headwaters. 12.1381.50 Sultan River 5.1 17-28-8E From mouth to headwaters. 12.1411.00 Skykomish River 25.0 12-27-6E From mouth to headwaters, excluding So. Fk. Skykomish River and Sultan River. 12.1430.00 No. Fk. Snoqualmie 2.2 26-24-8E From mouth to headwaters. 12.1445.00 Snoqualmie River 40.0 19-24-8E From Snoqualmie Falls to headwaters, excluding No. Fork Snoqualmie River. 12.1485.00 Tolt River 8.7 31-26-8E From mouth to headwaters. 12.1490.00 Snoqualmie River 23.0 9-25-7E From confluence with Harris Creek to Snoqualmie Falls, excluding Tolt River. 12. Snoqualmie River 2.5 26-27-6E From mouth to confluence with Harris Creek, including Harris Creek. 12.1554.00 Pilchuck River 1.9 18-28-6E From mouth to headwaters. 12.1508.00 Snohomish River 20.4 16-27-6E From influence of mean annual high tide at low base flow levels to confluence with Skykomish River and Snoqualmie River, excluding Pilchuck River. (2) Instream flows established for the stream management units in WAC 173-507-020(1) are as follows: INSTREAM FLOWS IN THE SNOHOMISH RIVER BASIN (in Cubic Feet per Second) Month Day 12.1330.00 So. Fk. Skykomish 12.1411.00 Skykomish 12.1430.00 No. Fk.* Snoqualmie No. Fk.** Snoqualmie Jan. 1 900 2200 260 200 15 900 2200 260 200 Feb. 1 900 2200 260 200 15 900 2200 260 200 Mar. 1 900 2200 260 200 15 900 2200 300 200 Apr. 1 1100 2650 300 200 15 1250 3250 300 200 May 1 1250 4000 300 200 15 1250 4900 300 200 June 1 1250 4900 300 200 15 1250 4900 300 200 July 1 1250 3250 300 200 15 950 2170 195 140 Aug. 1 650 1450 130 100 15 450 1000 130 100 Sept. 1 450 1000 130 100 15 450 1000 130 100 Oct. 1 550 1300 130 130 15 700 1700 165 165 Nov. 1 900 2200 210 200 15 900 2200 260 200 Dec. 1 900 2200 260 200 15 900 2200 260 200 - - - - INSTREAM FLOWS IN THE SNOHOMISH RIVER BASIN (in Cubic Feet per Second) Month Day 12.1330.00 So. Fk. Skykomish 12.1411.00 Skykomish 12.1430.00 No. Fk.* Snoqualmie No. Fk.** Snoqualmie Jan. 1 900 2200 260 200 15 900 2200 260 200 Feb. 1 900 2200 260 200 15 900 2200 260 200 Mar. 1 900 2200 260 200 15 900 2200 300 200 Apr. 1 1100 2650 300 200 15 1250 3250 300 200 May 1 1250 4000 300 200 15 1250 4900 300 200 June 1 1250 4900 300 200 15 1250 4900 300 200 July 1 1250 3250 300 200 15 950 2170 195 140 Aug. 1 650 1450 130 100 15 450 1000 130 100 Sept. 1 450 1000 130 100 15 450 1000 130 100 Oct. 1 550 1300 130 130 15 700 1700 165 165 Nov. 1 900 2200 210 200 15 900 2200 260 200 Dec. 1 900 2200 260 200 15 900 2200 260 200 - - - - * Normal year flows must be maintained at all times unless a critical condition is declared by the director. The director, or his designee, may authorize, in consultation with the state departments of fisheries and wildlife, a reduction in instream flows during a critical condition period. At no time are diversions subject to this regulation permitted for any reason when flows fall below the following critical year flows, except where a declaration of overriding considerations of public interest is made by the director. ** Critical year flows represent flows below which the department believes substantial damage to instream values will occur. * Normal year flows must be maintained at all times unless a critical condition is declared by the director. The director, or his designee, may authorize, in consultation with the state departments of fisheries and wildlife, a reduction in instream flows during a critical condition period. At no time are diversions subject to this regulation permitted for any reason when flows fall below the following critical year flows, except where a declaration of overriding considerations of public interest is made by the director. ** Critical year flows represent flows below which the department believes substantial damage to instream values will occur. Month Day 12.1381.50 Sulton 12.1445.00 Snoqualmie (above Falls) 12.1485.50 Tolt River* Tolt River** Jan. 1 1550 280 190 15 1550 280 190 Feb. 1 1550 280 190 15 1550 280 190 Mar. 1 1550 280 190 15 1550 280 190 Apr. 1 1550 280 190 15 1550 280 190 May 1 1550 280 190 15 1550 280 190 June 1 1550 280 190 15 1550 280 165 July 1 1550 280 140 15 1100 240 120 Aug. 1 770 170 120 15 600 120 120 Sept. 1 600 120 120 15 600 120 120 Oct. 1 820 190 185 15 1100 280 190 Nov. 1 1550 280 190 15 1550 280 190 Dec. 1 1550 280 190 15 1550 280 190 - - - - Month Day 12.1381.50 Sulton 12.1445.00 Snoqualmie (above Falls) 12.1485.50 Tolt River* Tolt River** Jan. 1 1550 280 190 15 1550 280 190 Feb. 1 1550 280 190 15 1550 280 190 Mar. 1 1550 280 190 15 1550 280 190 Apr. 1 1550 280 190 15 1550 280 190 May 1 1550 280 190 15 1550 280 190 June 1 1550 280 190 15 1550 280 165 July 1 1550 280 140 15 1100 240 120 Aug. 1 770 170 120 15 600 120 120 Sept. 1 600 120 120 15 600 120 120 Oct. 1 820 190 185 15 1100 280 190 Nov. 1 1550 280 190 15 1550 280 190 Dec. 1 1550 280 190 15 1550 280 190 - - - - * Normal year flows must be maintained at all times unless a critical condition is declared by the director. The director, or his designee, may authorize, in consultation with the state departments of fisheries and wildlife, a reduction in instream flows during a critical condition period. At no time are diversions subject to this regulation permitted for any reason when flows fall below the following critical year flows, except where a declaration of overriding considerations of public interest is made by the director. ** Critical year flows represent flows below which the department believes substantial damage to instream values will occur. * Normal year flows must be maintained at all times unless a critical condition is declared by the director. The director, or his designee, may authorize, in consultation with the state departments of fisheries and wildlife, a reduction in instream flows during a critical condition period. At no time are diversions subject to this regulation permitted for any reason when flows fall below the following critical year flows, except where a declaration of overriding considerations of public interest is made by the director. ** Critical year flows represent flows below which the department believes substantial damage to instream values will occur. Month Day 12.1490.00 Snoqualmie (Carnation) 12. Snoqualmie (mouth) 12.1554.00 Pilchuck R. 12.1508.00 Snohomish R. Jan. 1 2500 2800 300 6000 15 2500 2800 300 6000 Feb. 1 2500 2800 300 6000 15 2500 2800 300 6000 Mar. 1 2500 2800 300 6000 15 2500 2800 300 6000 Apr. 1 2500 2800 300 6000 15 2500 2800 300 6500 May 1 2500 2800 300 7200 15 2500 2800 300 8000 June 1 2500 2800 300 8000 15 2500 2800 300 8000 July 1 1850 2180 220 5700 15 1300 1550 160 4000 Aug. 1 950 1080 120 2800 15 700 800 85 2000 Sept. 1 700 800 85 2000 15 700 800 85 2000 Oct. 1 1050 1200 130 2900 15 1650 1850 200 4000 Nov. 1 2500 2800 300 6000 15 2500 2800 300 6000 Dec. 1 2500 2800 300 6000 15 2500 2800 300 6000 Month Day 12.1490.00 Snoqualmie (Carnation) 12. Snoqualmie (mouth) 12.1554.00 Pilchuck R. 12.1508.00 Snohomish R. Jan. 1 2500 2800 300 6000 15 2500 2800 300 6000 Feb. 1 2500 2800 300 6000 15 2500 2800 300 6000 Mar. 1 2500 2800 300 6000 15 2500 2800 300 6000 Apr. 1 2500 2800 300 6000 15 2500 2800 300 6500 May 1 2500 2800 300 7200 15 2500 2800 300 8000 June 1 2500 2800 300 8000 15 2500 2800 300 8000 July 1 1850 2180 220 5700 15 1300 1550 160 4000 Aug. 1 950 1080 120 2800 15 700 800 85 2000 Sept. 1 700 800 85 2000 15 700 800 85 2000 Oct. 1 1050 1200 130 2900 15 1650 1850 200 4000 Nov. 1 2500 2800 300 6000 15 2500 2800 300 6000 Dec. 1 2500 2800 300 6000 15 2500 2800 300 6000 (3) Instream flow hydrographs, as represented in the document entitled "Snohomish River instream resource protection program," shall be used for definition of instream flows on those days not specifically identified in WAC 173-507-020(2). (4) All consumptive water rights hereafter established shall be expressly subject to the instream flows established in WAC 173-507-020 (1) through (3). (5) At such time as the departments of fisheries and/or wildlife and the department of ecology agree that additional stream management units should be defined, other than those specified in WAC 173-507-020(1), the department of ecology shall identify additional control stations and management units on streams and tributaries within the basin and shall set instream flows where possible for those stations as provided in chapters 90.22 and 90.54 RCW.