WAC 173-505-050
WAC 173-505-050. Establishment of instream flows
(1) Instream flows established in this section protect stream flows from future withdrawals, and preserve flow levels that are necessary to protect wildlife, fish, water quality, scenic, aesthetic and other environmental values, navigational values, and stock watering requirements.
(2) Instream flows established in this section are water rights with a priority date the same as the effective date of this chapter.
(3) Instream flows are expressed in cubic feet per second (cfs). These flows are measured at the control points identified in WAC 173-505-040 and apply to the stream management reach. The instream flow provisions for any water right located in a stream management unit shall specifically describe the instream flow levels for the control station in that unit and shall refer generally to other downstream instream flow requirements that may also become controlling and critical to the use of water under such right.
(4) Instream flows are to be protected from impairment by junior water rights. Except as provided in WAC 173-505-080 , 173-505-090 , and 173-505-110 , junior water rights shall be exercised only when flow conditions provide enough water to satisfy senior rights, including the instream flows set in this chapter. Withdrawals of water that would conflict with the established instream flows shall be authorized only in those situations where it is clear that overriding considerations of the public interest will be served.
(5) Stream flow requirements on existing water rights are not modified by this chapter. Existing water rights that include a provision that water use will be subject to future instream flows are now subject to the instream flows established in WAC 173-505-050.
(6) Instream flows are established for the stream management units in WAC 173-505-040 , as follows:
Table 2
Instream Flows for the Mainstem and North and South Forks, Stillaguamish River
(in cubic feet per second) (RM = River Mile)
Ecology Station #05A070 USGS Station #12167000 Ecology Station #05B090 USGS Station #12161000 Month Day Stillaguamish RM 11.2 North Fork Stillaguamish RM 6.5 North Fork Stillaguamish RM 17.6 South Fork Stillaguamish RM 24.4 South Fork Stillaguamish RM 34.9 Jan. 1-31 2200 1200 915 1800 1200 Feb. 1-29 2000 1200 850 1600 1200 Mar. 1-15 2000 1300 850 2250 1600 16-31 2000 1300 915 2250 1600 Apr. 1-30 2000 1300 915 2000 1600 May 1-31 2000 1300 915 2000 1600 Jun. 1-15 2000 1300 915 1200 1060 16-30 2000 1400 650 1200 1060 Jul. 1-15 2000 1100 600 1150 1060 16-31 2000 800 500 750 700 Aug. 1-15 1700 800 425 750 700 16-31 1700 800 500 750 700 Sep. 1-15 1700 800 700 775 700 16-30 1700 800 850 775 700 Oct. 1-15 1700 800 870 1250 1200 16-31 1700 800 870 1900 1700 Nov. 1-15 2200 950 915 2300 1800 16-30 2200 950 915 2300 1800 Dec. 1-31 2200 1300 915 2500 1800
Ecology
Station #05A070
USGS
Station
#12167000
Ecology
Station #05B090
USGS
Station #12161000
Month
Day
Stillaguamish RM 11.2
North Fork Stillaguamish RM 6.5
North Fork Stillaguamish RM 17.6
South Fork Stillaguamish RM 24.4
South Fork Stillaguamish RM 34.9
Jan.
1-31
2200
1200
915
1800
1200
Feb.
1-29
2000
1200
850
1600
1200
Mar.
1-15
2000
1300
850
2250
1600
16-31
2000
1300
915
2250
1600
Apr.
1-30
2000
1300
915
2000
1600
May
1-31
2000
1300
915
2000
1600
Jun.
1-15
2000
1300
915
1200
1060
16-30
2000
1400
650
1200
1060
Jul.
1-15
2000
1100
600
1150
1060
16-31
2000
800
500
750
700
Aug.
1-15
1700
800
425
750
700
16-31
1700
800
500
750
700
Sep.
1-15
1700
800
700
775
700
16-30
1700
800
850
775
700
Oct.
1-15
1700
800
870
1250
1200
16-31
1700
800
870
1900
1700
Nov.
1-15
2200
950
915
2300
1800
16-30
2200
950
915
2300
1800
Dec.
1-31
2200
1300
915
2500
1800
Table 3
Instream Flows for Tributaries of
the Mainstem and North and South Forks Stillaguamish River Basin
(in cubic feet per second) (RM = River Mile)
RM 0.5 RM 17 RM 1.2 RM 3.3 RM 5.0 RM 0.3 RM 1.3 RM 0.3 Month Day Pilchuck Creek Pilchuck Creek Squire Creek Jim Creek Canyon Creek Lake Creek Deer Creek Brooks Creek Jan. 1-31 170 98 200 250 525 21 411 39 Feb. 1-29 170 98 200 250 450 21 411 39 Mar. 1-15 170 98 280 250 450 21 474 68 Mar. 16-31 170 98 280 250 450 21 474 68 Apr. 1-30 170 98 280 250 450 21 474 68 May 1-31 170 98 280 250 450 21 474 68 Jun. 1-15 170 98 280 250 450 21 313 45 Jun. 16-30 170 98 280 250 350 21 313 45 Jul. 1-31 170 98 200 250 350 21 195 45 Aug. 1-31 140 98 200 250 350 21 88 17 Sep. 1-30 170 98 200 250 400 21 353 17 Oct. 1-31 170 98 200 250 525 21 617 39 Nov. 1-15 170 98 160 250 525 21 411 39 Nov. 16-30 170 98 160 250 525 21 411 39 Dec. 1-31 170 98 160 250 525 21 411 39
RM 0.5
RM 17
RM 1.2
RM 3.3
RM 5.0
RM 0.3
RM 1.3
RM 0.3
Month
Day
Pilchuck Creek
Pilchuck Creek
Squire Creek
Jim
Creek
Canyon Creek
Lake Creek
Deer Creek
Brooks Creek
Jan.
1-31
170
98
200
250
525
21
411
39
Feb.
1-29
170
98
200
250
450
21
411
39
Mar.
1-15
170
98
280
250
450
21
474
68
Mar.
16-31
170
98
280
250
450
21
474
68
Apr.
1-30
170
98
280
250
450
21
474
68
May
1-31
170
98
280
250
450
21
474
68
Jun.
1-15
170
98
280
250
450
21
313
45
Jun.
16-30
170
98
280
250
350
21
313
45
Jul.
1-31
170
98
200
250
350
21
195
45
Aug.
1-31
140
98
200
250
350
21
88
17
Sep.
1-30
170
98
200
250
400
21
353
17
Oct.
1-31
170
98
200
250
525
21
617
39
Nov.
1-15
170
98
160
250
525
21
411
39
Nov.
16-30
170
98
160
250
525
21
411
39
Dec.
1-31
170
98
160
250
525
21
411
39
Table 4
Instream Flows for Tributaries of
the Mainstem and North and South Forks Stillaguamish River Basin
(in cubic feet per second) (RM = River Mile)
RM 0.3 RM 1.0 RM 0.5 RM 0.4 RM 0.3 RM 0.2 RM 0.2 RM 0.1 Month Day Montague Creek Rollins Creek Boulder Creek French Creek Segelson Creek Furland Creek Ashton Creek Grant Creek Jan. 1-31 29 47 167 56 47 33 34 67 Feb. 1-29 29 47 167 56 47 33 34 67 Mar. 1-15 53 80 203 73 79 44 46 87 Mar. 16-31 53 80 203 73 79 44 46 87 Apr. 1-30 53 80 203 73 79 44 46 87 May 1-31 53 80 203 73 79 44 46 87 Jun. 1-15 35 53 134 48 52 29 30 57 Jun. 16-30 35 53 134 48 52 29 30 57 Jul. 1-31 35 53 134 48 52 29 30 57 Aug. 1-31 12 20 154 18 20 10 10 23 Sep. 1-30 12 47 250 84 47 49 51 101 Oct. 1-31 29 47 167 84 47 49 51 101 Nov. 1-15 29 47 167 56 47 33 34 67 Nov. 16-30 29 47 167 56 47 33 34 67 Dec. 1-31 29 47 167 56 47 33 34 67
RM 0.3
RM 1.0
RM 0.5
RM 0.4
RM 0.3
RM 0.2
RM 0.2
RM 0.1
Month
Day
Montague Creek
Rollins Creek
Boulder Creek
French Creek
Segelson Creek
Furland Creek
Ashton Creek
Grant Creek
Jan.
1-31
29
47
167
56
47
33
34
67
Feb.
1-29
29
47
167
56
47
33
34
67
Mar.
1-15
53
80
203
73
79
44
46
87
Mar.
16-31
53
80
203
73
79
44
46
87
Apr.
1-30
53
80
203
73
79
44
46
87
May
1-31
53
80
203
73
79
44
46
87
Jun.
1-15
35
53
134
48
52
29
30
57
Jun.
16-30
35
53
134
48
52
29
30
57
Jul.
1-31
35
53
134
48
52
29
30
57
Aug.
1-31
12
20
154
18
20
10
10
23
Sep.
1-30
12
47
250
84
47
49
51
101
Oct.
1-31
29
47
167
84
47
49
51
101
Nov.
1-15
29
47
167
56
47
33
34
67
Nov.
16-30
29
47
167
56
47
33
34
67
Dec.
1-31
29
47
167
56
47
33
34
67
Table 5
Instream
Flows for Tributaries of
the Mainstem and North and South Forks Stillaguamish River Basin
(in cubic feet per second) (RM = River Mile)
RM 3.0 RM 0.5 RM 7.0 RM 2.0 RM 1.1 RM 1.5 Month Day Church Creek Glade Bekken Creek Portage Creek Fish Creek Rock Creek Koonz Creek Jan. 1-31 24 10 11 16 29 19 Feb. 1-29 24 10 11 16 29 19 Mar. 1-15 43 21 22 30 53 36 Mar. 16-31 43 21 22 30 53 36 Apr. 1-30 43 21 22 30 53 36 May 1-31 43 21 22 30 53 36 Jun. 1-15 28 14 14 20 35 24 Jun. 16-30 28 14 14 20 35 24 Jul. 1-31 28 14 14 20 35 24 Aug. 1-31 10 4 4 6 12 8 Sep. 1-30 10 4 4 6 29 19 Oct. 1-31 24 10 11 16 29 19 Nov. 1-15 24 10 11 16 29 19 Nov. 16-30 24 10 11 16 29 19 Dec. 1-31 24 10 11 16 29 19
RM 3.0
RM 0.5
RM 7.0
RM 2.0
RM 1.1
RM 1.5
Month
Day
Church
Creek
Glade Bekken Creek
Portage Creek
Fish
Creek
Rock
Creek
Koonz
Creek
Jan.
1-31
24
10
11
16
29
19
Feb.
1-29
24
10
11
16
29
19
Mar.
1-15
43
21
22
30
53
36
Mar.
16-31
43
21
22
30
53
36
Apr.
1-30
43
21
22
30
53
36
May
1-31
43
21
22
30
53
36
Jun.
1-15
28
14
14
20
35
24
Jun.
16-30
28
14
14
20
35
24
Jul.
1-31
28
14
14
20
35
24
Aug.
1-31
10
4
4
6
12
8
Sep.
1-30
10
4
4
6
29
19
Oct.
1-31
24
10
11
16
29
19
Nov.
1-15
24
10
11
16
29
19
Nov.
16-30
24
10
11
16
29
19
Dec.
1-31
24
10
11
16
29
19
Table 6
Instream Flows for Tributaries of
the Mainstem and North and South Forks Stillaguamish River Basin
(in cubic feet per second) (RM = River Mile)
RM 1.5 RM 1.0 RM 0.1 RM 1.6 RM 0.0 Month Day Harvey Creek Armstrong Creek Jordan Creek Tiger Creek Siberia Creek Jan. 1-31 9 34 18 27 37 Feb. 1-29 9 34 18 27 37 Mar. 1-15 6 46 34 48 49 Mar. 16-31 6 46 34 48 49 Apr. 1-30 6 46 34 48 49 May 1-31 4 46 34 48 49 Jun. 1-15 4 30 22 32 32 Jun. 16-30 4 30 22 32 32 Jul. 1-31 4 30 22 32 32 Aug. 1-31 4 10 7 11 11 Sep. 1-30 4 51 18 11 27 Oct. 1-31 4 51 18 11 55 Nov. 1-15 9 34 18 27 37 Nov. 16-30 9 34 18 27 37 Dec. 1-31 9 34 18 27 37
RM 1.5
RM 1.0
RM 0.1
RM 1.6
RM 0.0
Month
Day
Harvey
Creek
Armstrong
Creek
Jordan
Creek
Tiger
Creek
Siberia
Creek
Jan.
1-31
9
34
18
27
37
Feb.
1-29
9
34
18
27
37
Mar.
1-15
6
46
34
48
49
Mar.
16-31
6
46
34
48
49
Apr.
1-30
6
46
34
48
49
May
1-31
4
46
34
48
49
Jun.
1-15
4
30
22
32
32
Jun.
16-30
4
30
22
32
32
Jul.
1-31
4
30
22
32
32
Aug.
1-31
4
10
7
11
11
Sep.
1-30
4
51
18
11
27
Oct.
1-31
4
51
18
11
55
Nov.
1-15
9
34
18
27
37
Nov.
16-30
9
34
18
27
37
Dec.
1-31
9
34
18
27
37