Table 9.  Fork length distribution of juvenile chinook sampled below Bonneville Dam, 2004.
                                     
Bonneville Dam
          Number of chinook in millimeters  Mean length % chf tailwater discharge water
Week Date Total   Range 30-39 40-49 50-59 60-69 70-79 80-89 90-100  > 100  chf < 100 < 60mm 60-100mm  (ft.)* (kcfs)* temp. (oF)
4 20-Jan 55   38 - 145 4 6 - - - - 5 40 52.6 67% 33% 12.8 136.8 35
4 23-Jan 84 40 - 139 - 4 - - - 3 12 65 82.3 21% 79% 12.3 128.9 35
5 27-Jan 36 35 - 135 3 12 - - - - 4 17 53.3 79% 21% 15.0 150.5 35
5 30-Jan 9 35 - 46 4 5 - - - - - - 40.0 100% 0% 17.5 171.2 38
6 3-Feb 13 34 - 144 6 5 - - - - 1 1 43.6 92% 8% 15.1 154.3 38
7 10-Feb 46 32 - 125 13 1 - - - 1 6 25 87.0 67% 33% 12.3 132.2 38
8 17-Feb 186 35 - 52 52 131 3 - - - - - 40.9 100% 0% 11.4 130.6 38
8 20-Feb 10 37 - 43 5 5 - - - - - - 39.6 100% 0% 15.8 149.5 38
9 24-Feb 52 37 - 114 5 23 2 - - 1 11 10 56.3 71% 29% 14.9 149.8 38
9 27-Feb 24 37 - 128 6 3 - - - 1 4 10 59.4 64% 36% 13.2 150.4 38
10 1-Mar 512 33 - 106 44 434 24 1 - - 4 5 44.0 99% 1% 12.9 141.5 39
11 8-Mar 22 35 - 69 7 8 - 7 - - - - 49.1 68% 32% 11.5 123.3 40
11 11-Mar 47 37 - 68 5 33 3 6 - - - - 45.9 87% 13% 12.4 144.4 40
12 15-Mar 397 35 - 112 75 222 23 64 11 - - 2 47.0 81% 19% 12.5 136.2 42
12 18-Mar 173 34 - 114 35 65 4 44 23 - - 2 52.5 61% 39% 14.3 153.2 43
13 23-Mar 176 34 - 74 66 105 1 1 3 - - - 41.0 98% 2% 17.4 147.6 44
13 27-Mar 780 34 - 126 290 325 6 16 21 - 1 5 41.9 94% 6% 13.5 157.2 45
14 29-Mar 295 35 - 76 103 184 4 4 - - - - 40.8 99% 1% 14.6 161 46
14 1-Apr 330 35 - 131 63 203 16 10 18 2 1 17 45.2 86% 9% 14.4 161.5 46
15 5-Apr 1486 34 - 142 118 487 7 3 5 1 - 1 41.9 98% 1% 12.4 137.7 47
15 8-Apr 2292   33 - 79 215 672 18 3 5 - - - 42.0 99% 1% 14.6 158.5 48
16 12-Apr 2114   35 - 164 73 528 56 9 5 10 - 2 45.1 96% 4% 13.9 154.9 49
16 15-Apr 1586   34 - 156 183 708 59 12 15 8 - 6 43.9 96% 4% 16.4 201.3 49
17 19-Apr 1531   35 - 152 131 900 151 24 13 21 9 14 45.7 95% 5% 15.7 198.1 50
17 22-Apr 774   35 - 140 113 583 45 2 2 23 5 1 44.5 96% 4% 18.5 210.8 51
18 27-Apr 1753   36 - 142 121 687 71 10 13 20 13 1 45.7 94% 6% 14.5 189.3 51
18 30-Apr 387   36 - 95 59 297 26 1 1 2 1 - 44.2 99% 1% 15.7 199.1 52
19 3-May 1536   34 - 121 108 632 81 8 4 4 3 1 44.7 98% 2% 14.7 191.3 53
19 6-May 943   34 - 96 122 667 139 3 - 1 1 - 44.7 98% 1% 19.2 245.7 54
20 10-May 1295   34 - 142 106 739 184 7 2 10 11 4 46.8 97% 3% 16.6 228.8 55
20 13-May 536   34 - 100 69 370 73 4 1 6 12 1 46.3 96% 4% 20.4 246.3 55
Totals from March 27 through April 19, April 27, May 3, and May 10 include additional fish that were not sampled.