1. (1) Minimum instream flows are established for stream management units with monitoring to take place at certain control points as follows:

   Stream Management Unit Information

   Stream ManagementUnit Name, ControlStation Name andNumber	Control StationLocation by RiverMile, Section,Township, Range	Affected StreamReach
   Lower Okanogan
   Okanogan R.at Malott(12447200)		17.0,9-32-25E	Okanogan River confluence withWells Pool to confluence of Chewiliken Cr.
   Middle Okanogan
   Okanogan R.nr. Tonasket(12445000)		50.8,8-36-27E	Okanogan River confluence of Chewiliken Creek to confluence Similkameen River
   Upper Okanogan
   Okanogan R.at Oroville(12439500)		77.3,27-40-27E	Okanogan River confluence of Similkameen River to Osoyoos Lake
   Similkameen
   Similkameen R.at Nighthawk(12442500)		15.8,7-40-26E	Similkameen River confluence with Okanogan River to Canadian Border

2. (2) Minimum instream flows established for the stream management units in WAC 173-549-020(1) are as follows:

   Minimum Instream Flows in the

   Okanogan River

   (All Figures in Cubic Feet Per Second)

   Month	Day	LowerOkanogan12447200	MiddleOkanogan1244500	UpperOkanogan124426000	Similkameen12439500
   Jan.	1	860		800		320		400
   	15	830		800		320		400
   Feb.	1	820		800		320		400
   	15	850		800		320		400
   Mar.	1	880		800		320		425
   	15	900		800		320		450
   Apr.	1	925		910		330		510
   	15	1,100		1,070		340		640
   May	1	1,750		1,200		350		1,100
   	15	3,800		3,800		500		3,400
   Jun.	1	3,800		3,800		500		3,400
   	15	3,800		3,800		500		3,400
   Jul.	1	2,100		2,150		420		1,900
   	15	1,200		1,200		350		1,070
   Aug.	1	800		840		320		690
   	15	600		600		300		440
   Sept.	1	620		600		300		400
   	15	700		600		300		400
   Oct.	1	750		730		330		450
   	15	960		900		370		500
   Nov.	1	950		900		370		500
   	15	950		900		320		500
   Dec.	1	930		900		320		500
   	15	900		850		320		450

3. (3) Minimum instream flow hydrographs, as represented in WAC 173-549-900, shall be used for definition of minimum instream flows on those days not specifically identified in WAC 173-549-020(2).
4. (4) Future consumptive water right permits hereafter issued for diversion of surface water from the mainstem Okanogan River and the Similkameen River shall be expressly subject to minimum instream flows established in WAC 173-549-020 (1) through (3) except those described in WAC 173-549-070.
5. (5) Projects that would reduce the flow in a portion of a stream's length (e.g. hydroelectric projects that bypass a portion of a stream) will be considered consumptive only with respect to the affected portion of the stream. Such projects will be subject to instream flows as specified by the department. These flows may be those established in WAC 173-549-020 or, when appropriate, may be flows specifically tailored to that particular project and stream reach. When studies are required to determine such reach- and project-specific flow requirements, the department may require the project proponent to conduct such studies.

[Statutory Authority: Chapters 90.54 and 90.22 RCW. WSR 84-13-076 (Order DE 84-15), § 173-549-020, filed 6/20/84; Order DE 76-25, § 173-549-020, filed 7/14/76.]