1. (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 ManagementUnit Name	Control Stationby River Mile andSection, Townshipand Range	Affected Stream Reach IncludingTributaries
   12.1330.00So. Fk. SkykomishRiver	51.628-27-10E	From confluence with N. Fk. Skykomish River to headwaters.
   12.1381.50Sultan River	5.117-28-8E	From mouth to headwaters.
   12.1411.00Skykomish River	25.012-27-6E	From mouth to headwaters, excluding So. Fk. Skykomish River and Sultan River.
   12.1430.00No. Fk. Snoqualmie	2.226-24-8E	From mouth to headwaters.
   12.1445.00Snoqualmie River	40.019-24-8E	From Snoqualmie Falls to headwaters, excluding No. Fork Snoqualmie River.
   12.1485.00Tolt River	8.731-26-8E	From mouth to headwaters.
   12.1490.00Snoqualmie River	23.09-25-7E	From confluence with Harris Creek to Snoqualmie Falls, excluding Tolt River.
   12.Snoqualmie River	2.526-27-6E	From mouth to confluence with Harris Creek, including Harris Creek.
   12.1554.00Pilchuck River	1.918-28-6E	From mouth to headwaters.
   12.1508.00Snohomish River	20.416-27-6E	From influence of mean annual high tide at low base flow levels to confluence with Skykomish River and Snoqualmie River, excluding Pilchuck River.

2. (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	12.1330.00So. Fk.Skykomish	12.1411.00Skykomish	12.1430.00No. 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.

   Month	Day	12.1381.50Sulton	12.1445.00Snoqualmie(above Falls)	12.1485.50Tolt 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.

   Month	Day	12.1490.00Snoqualmie(Carnation)	12.Snoqualmie(mouth)	12.1554.00PilchuckR.	12.1508.00SnohomishR.
   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. (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. (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. (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.

[Statutory Authority: Chapters 43.21B, 43.27A, 90.22 and 90.54 RCW. WSR 88-13-037 (Order 88-11), § 173-507-020, filed 6/9/88. Statutory Authority: Chapters 90.22 and 90.54 RCW. WSR 79-10-003 (Order DE 79-8), § 173-507-020, filed 9/6/79.]