Fork length distribution of juvenile chum sampled below Bonneville Dam, 2007
                                   
Bonneville Dam
        Number of chum in millimeters  Mean length % chm tailwater discharge water
Week Date Total Range 30-39 40-49 50-59 60-69 70-79 80-89 90-100  > 100  CHM < 100 < 60mm 60-100mm  (ft.) (kcfs) temp. (oF)*
6 1-Feb 0 - 0 0 0 0 0 0 0 0 - - - 14.5 188.4 34.3  
7 5-Feb 0 - 0 0 0 0 0 0 0 0 - - - 13.7 146.1 35.1  
7 8-Feb 0 - 0 0 0 0 0 0 0 0 - - - 13.9 147.7 35.2  
8 12-Feb 9 36-46 2 7 0 0 0 0 0 0 41.0 100% 0% 13.6 147.3 35.8  
8 15-Feb 26 40-48 0 26 0 0 0 0 0 0 43.9 100% 0% 13.5 139.8 36.0  
9 20-Feb 4 40-44 0 4 0 0 0 0 0 0 42.8 100% 0% 17.1 181.5 37.6  
9 23-Feb 20 38-47 5 15 0 0 0 0 0 0 41.3 100% 0% 13.5 130.0 37.8  
10 26-Feb 52 38-47 9 43 0 0 0 0 0 0 41.8 100% 0% 13.4 137.7 37.8  
10 1-Mar 4 34-42 2 2 0 0 0 0 0 0 38.8 100% 0% 16.1 176.6 37.9  
11 5-Mar 9 34-45 5 4 0 0 0 0 0 0 38.7 100% 0% 13.6 136.6 38.8  
11 8-Mar 9 38-44 3 6 0 0 0 0 0 0 40.6 100% 0% 15.1 159.8 39.4  
12 12-Mar 11 38-45 5 6 0 0 0 0 0 0 40.6 100% 0% 14.4 139.2 40.1  
12 15-Mar 2 40-41 0 2 0 0 0 0 0 0 40.5 100% 0% 19.7 226.4 40.6  
13 19-Mar 6 39-52 2 3 1 0 0 0 0 0 43.7 100% 0% 18.4 209.6 41.7  
13 22-Mar 1 42 0 1 0 0 0 0 0 0 42.0 100% 0% 20.5 232.2 42.3  
14 26-Mar 6 39-52 1 4 1 0 0 0 0 0 44.3 100% 0% 22.3 291.1 43.7  
14 29-Mar 13 39-50 1 11 1 0 0 0 0 0 42.4 100% 0% 20.0 230.5 43.5  
15 2-Apr 12 38-48 2 10 0 0 0 0 0 0 43.5 100% 0% 20.3 244.5 43.0  
15 5-Apr 6 38-44 1 5 0 0 0 0 0 0 41.0 100% 0% 21.4 270.8 43.5  
16 9-Apr 46 37-52 19 26 1 0 0 0 0 0 40.3 100% 0% 18.2 226.3 45.0  
16 12-Apr 40 36-66 13 25 1 1 0 0 0 0 42.2 98% 3% 17.2 198.4 47.8  
17 16-Apr 14 36-58 3 6 5 0 0 0 0 0 45.9 100% 0% 16.7 173.6 48.9  
17 19-Apr 29 35-48 13 16 0 0 0 0 0 0 39.9 100% 0% 18.3 203.8 49.5  
18 23-Apr 30 37-48 11 19 0 0 0 0 0 0 40.5 100% 0% 19.9 247.2 50.2  
18 26-Apr 142 35-53 17 124 1 0 0 0 0 0 41.6 100% 0% 19.6 249.4 51.1  
19 30-Apr 6 39-42 2 4 0 0 0 0 0 0 40.3 100% 0% 19.7 251.0 52.5  
19 3-May 7 40-50 6 1 0 0 0 0 0 0 42.7 100% 0% 21.8 278.1 51.6  
20 7-May 8 42-51 0 6 2 0 0 0 0 0 46.4 100% 0% 21.3 257.1 52.5  
20 10-May 0 - 0 0 0 0 0 0 0 0 - - - 23.0 304.1 52.9  
21 14-May 2 57-63 0 0 1 1 0 0 0 0 60.0 50% 50% 23.7 321.8 54.1  
21 17-May 1 55 0 0 1 0 0 0 0 0 55.0 100% 0% 21.4 266.7 56.7  
22 21-May 0 - 0 0 0 0 0 0 0 0 - - - 20.8 270.3 na  
22 24-May 0 - 0 0 0 0 0 0 0 0 - - - 20.4 253.0 58.6  
23 29-May 0 - 0 0 0 0 0 0 0 0 - - - 18.8 22.1 57.0  
                                     
515 122 376 15 2 0 0 0 0 43.0 100% 0%
* Temperature readings from USGS gauge, as of 4/12, taken from mouth of Hamilton Cr. sensor # 2.