Table 9.  Fork length distribution of juvenile chum sampled below Bonneville Dam, 2004.
                                     
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)
4 20-Jan 0   - - - - - - - - - - - - 12.8 136.8 35
4 23-Jan 0 - - - - - - - - - - - - 12.3 128.9 35
5 27-Jan 0 - - - - - - - - - - - - 15.0 150.5 35
5 30-Jan 0 - - - - - - - - - - - - 17.5 171.2 38
6 3-Feb 0 - - - - - - - - - - - - 15.1 154.3 38
7 10-Feb 0 - - - - - - - - - - - - 12.3 132.2 38
8 17-Feb 2 38 - 39 2 - - - - - - - 38.5 100% 0% 11.4 130.6 38
8 20-Feb 1 39 1 - - - - - - - 39.0 100% 0% 15.8 149.5 38
9 24-Feb 2 40 - 42 - 2 - - - - - - 41.0 100% 0% 14.9 149.8 38
9 27-Feb 0 - - - - - - - - - - - - 13.2 150.4 38
10 1-Mar 50 38 - 49 8 42 - - - - - - 41.6 100% 0% 12.9 141.5 39
11 8-Mar 69 35 - 44 32 37 - - - - - - 39.4 100% 0% 11.5 123.3 40
11 11-Mar 8 39 - 49 1 7 - - - - - - 45.0 100% 0% 12.4 144.4 40
12 15-Mar 68 35 - 47 13 55 - - - - - - 41.8 100% 0% 12.5 136.2 42
12 18-Mar 79   38 - 54 10 68 1 - - - - - 41.8 100% 0% 14.3 153.2 43
13 23-Mar 113   35 - 47 35 78 - - - - - - 40.7 100% 0% 17.4 147.6 44
13 27-Mar 113   35 - 52 27 84 2 - - - - - 40.9 100% 0% 13.5 157.2 45
14 29-Mar 21   35 - 42 7 14 - - - - - - 39.9 100% 0% 14.6 161.0 46
14 1-Apr 47   35 - 46 13 34 - - - - - - 40.8 100% 0% 14.4 161.5 46
15 5-Apr 1473   35 - 48 154 692 - - - - - - 40.8 100% 0% 12.4 137.7 47
15 8-Apr 2205   34 - 58 234 523 9 - - - - - 40.8 100% 0% 14.6 158.5 48
16 12-Apr 339   35 - 64 33 246 23 2 - - - - 43.8 99% 1% 13.9 154.9 49
16 15-Apr 103   36 - 52 14 85 4 - - - - - 43.4 100% 0% 16.4 201.3 49
17 19-Apr 133   37 - 55 18 104 11 - - - - - 43.3 100% 0% 15.7 198.1 50
17 22-Apr 17   35 - 51 6 10 1 - - - - - 41.9 100% 0% 18.5 210.8 51
18 27-Apr 12   39 - 57 3 6 3 - - - - - 43.6 100% 0% 14.5 189.3 51
19 3-May 5   42 - 52 - 4 1 - - - - - 44.8 100% 0% 14.7 191.3 53
19 6-May 1   47 - 1 - - - - - - 44.7 100% 0% 19.2 245.7 54
20 10-May 1   49 - 1 - - - - - - 46.8 100% 0% 16.6 228.8 55
20 13-May 2   42 - 56 - 1 1 - - - - - 46.3 100% 0% 20.4 246.3 55
Total from April 5 thru 12 include additional fish that were not sampled.