Grand Ronde Spring Chinook Super-Stock
Methods
Wild spring chinook releases from 1993 to 1997 in the Grand Ronde River sub-basin were
examined for individual fish detected at Lower Granite and at least
one subsequent PITTAG site. These fish were combined into cohorts
based on the date of initial detection. Cohorts were constructed by
combining 7 consecutive days of detections at Lower Granite Dam that
had a sample size of 15 or more fish. Cohorts with fewer than three
subsequent detections at Little Goose, Lower Monumental, or McNary
were discarded.
[1993]
[1994]
[1995]
[1996]
[1997]
[Model Results]
Table 1 . Average release dates and travel times
of wild spring chinook cohorts from the Grand Ronde sub-basin.
Average
Obs Date
at LGR |
Average
travel time
to GOS
(# fish)
|
Average
travel time
to LMN
(# fish)
|
Average
travel time
to MCN
(# fish)
|
|
1993
|
|
113.0
|
7.0 (18)
|
10.2 (6)
|
12.8 (7)
|
|
118.8
|
5.8 (38)
|
6.8 (30)
|
11.3 (20)
|
|
127.1
|
5.9 (15)
|
5.6 (14)
|
10.4 (8)
|
|
136.5
|
3.9 (9)
|
4.5 (10)
|
8.7 (8)
|
|
143.0
|
6.3 (3)
|
6.2 (5)
|
11.8 (7)
|
|
150.0
|
6.3 (8)
|
8.7 (12)
|
12.5 (3)
|
|
1994
|
|
109.1
|
6.0 (10)
|
10.6 (12)
|
14.2 (9)
|
|
113.6
|
6.0 (117)
|
9.5 (142)
|
16.0 (123)
|
|
119.2
|
7.0 (21)
|
9.3 (33)
|
17.7 (35)
|
|
129.4
|
4.7 (23)
|
6.2 (9)
|
12.4 (30)
|
|
137.1
|
4.3 (8)
|
8.2 (6)
|
13.6 (13)
|
|
1995
|
|
103.4
|
6.5 (54)
|
9.3 (57)
|
16.3 (53)
|
|
110.1
|
8.4 (16)
|
9.0 (22)
|
13.4 (19)
|
|
118.8
|
4.6 (27)
|
6.9 (22)
|
10.8 (23)
|
|
123.9
|
4.8 (70)
|
5.8 (90)
|
9.3 (52)
|
|
130.1
|
4.6 (33)
|
6.3 (39)
|
10.1 (21)
|
|
139.0
|
5.5 (11)
|
7.0 (17)
|
12.1 (7)
|
|
145.6
|
6.6 (24)
|
9.3 (24)
|
11.4 (10)
|
|
153.7
|
4.8 (19)
|
6.4 (28)
|
9.3 (9)
|
|
1996
|
|
103.9
|
6.1 (16)
|
7.5 (12)
|
12.2 (4)
|
|
109.6
|
5.4 (47)
|
6.9 (45)
|
10.5 (23)
|
|
116.7
|
5.5 (30)
|
7.8 (25)
|
10.9 (18)
|
|
123.6
|
7.9 (28)
|
9.9 (29)
|
13.7 (16)
|
|
130.3
|
5.4 (10)
|
6.6 (13)
|
8.7 (4)
|
|
137.2
|
4.5 (19)
|
4.7 (23)
|
8.7 (12)
|
|
1997
|
|
101.4
|
6.7 (12)
|
9.4 (15)
|
17.0 (4)
|
|
107.2
|
6.5 (24)
|
6.6 (20)
|
14.5 (9)
|
|
113.1
|
4.9 (25)
|
6.3 (27)
|
9.8 (12)
|
|
120.1
|
5.6 (14)
|
6.7 (22)
|
10.9 (7)
|
|
131.2
|
3.7 (21)
|
5.0 (25)
|
8.0 (5)
|
|
147.1
|
6.5 (7)
|
8.0 (9)
|
7.9 (5)
|
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