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Snake River Chinook Spring/Summer ESU Historical and Current Year Mean Travel Time Estimates

Click on a reach travel time in the table to view a plot of the reach-specific daily mean travel time as it varies throughout the season. The date of the daily mean travel time is determined by and plotted on the reach entry date, i.e., the date of the last detection for each PIT-tagged fish at the first project in the reach. The plots include a 95% confidence interval for each reach entry date on which more than one fish started traversing the reach.


Harmonic mean travel times by reach and year
Reach 2002 2003 2004 2005 2006 2007 2008 2009 2010 2011 2012 2013 2014 2015 2016 2017 2018 2019 2020
LGR-LGS 3.70 3.59 3.95 4.68 3.46 3.87 4.10 3.23 2.60 3.24 3.19 2.69 3.40 3.01 2.93 3.01 3.18 3.13 3.02
LGR-LMN 7.10 5.07 7.93 7.03 5.23 5.57 5.68 4.97 3.69 4.75 5.19 4.22 5.60 5.13 4.61 4.50 4.91 4.74 4.51
LGR-IHR   6.26 17.63 8.42 6.55 7.36 7.64 6.99 5.80 6.22 6.92 5.93 7.06 6.56 6.28 5.89 5.99 6.94 6.77
LGR-MCN 11.58 9.35 10.12 10.62 9.07 9.30 10.70 9.40 8.48 9.51 9.28 8.62 9.59 9.37 7.97 8.35 9.12 9.07 8.11
LGR-JDA 13.90 11.90 12.77 13.81 11.68 12.54 12.84 12.89 11.54 11.10 11.46 11.07 12.77 12.48 10.88 10.50 11.15 10.62 9.83
LGR-BON 15.45 14.36 15.27 15.63 13.34 13.67 14.73 13.50 13.33 14.58 14.16 11.39 13.42 13.31 11.28 11.42 11.32 12.17 11.13
LGS-LMN 2.66 1.55 2.59 2.06 1.79 1.83 1.79 1.60 1.41 1.79 1.74 1.64 1.82 2.02 1.56 1.53 1.56 1.60 1.58
LGS-IHR   3.45 7.29 3.56 3.24 3.42 3.49 3.23 3.00 3.38 3.39 3.10 3.41 3.67 3.20 3.03 2.67 3.41 3.19
LGS-MCN 6.86 5.52 5.90 5.53 5.63 5.55 6.32 5.87 5.43 6.04 5.59 5.52 5.98 5.96 4.90 5.52 5.45 5.70 5.01
LGS-JDA 9.46 8.10 9.02 9.02 8.57 8.98 8.53 9.17 8.65 8.45 8.15 8.07 9.25 9.27 7.88 8.21 7.81 7.91 6.50
LGS-BON 11.10 10.23 10.97 10.37 10.38 10.20 9.90 10.09 10.46 11.36 10.43 8.96 10.04 9.78 8.58 8.91 8.13 9.66 7.83
LMN-IHR   5.05 1.57 1.37 1.48 1.54 1.63 1.54 1.28 1.53 1.62 1.46 1.61 2.13 1.59 1.36 1.28 1.51 1.76
LMN-MCN 3.43 3.40 3.94 3.38 3.77 3.25 4.32 4.24 3.38 4.15 3.90 3.65 4.07 4.34 3.47 3.89 3.77 3.89 3.68
LMN-JDA 6.40 5.88 7.27 6.82 6.85 6.57 6.70 7.66 6.13 6.34 6.50 6.27 7.28 7.82 6.33 6.39 6.21 6.08 5.00
LMN-BON 7.63 7.87 8.23 8.28 8.59 7.94 8.20 8.67 7.92 9.51 8.77 7.07 7.99 8.93 7.24 7.24 6.77 7.60 6.47
IHR-MCN   2.45 1.28 1.86 2.20 1.71 2.42 2.52 1.99 2.29 2.12 1.86 2.17 2.21 1.97 2.42 2.02 2.75 2.05
IHR-JDA   9.00 4.29 5.11 5.34 4.90 4.94 6.10 5.30 4.74 5.11 4.48 5.39 5.15 4.89 4.91 4.13 5.58 3.77
IHR-BON   8.46 9.82 6.86 7.28 6.37 6.49 7.21 7.10 7.41 6.81 5.46 6.21 6.25 5.63 5.74 4.98 7.26 5.31
MCN-JDA 3.33 3.69 3.87 3.34 3.35 3.35 2.95 3.65 3.67 3.36 3.10 2.94 3.38 3.63 2.90 2.90 2.82 2.94 2.32
MCN-BON 4.95 5.73 5.49 4.99 5.04 4.75 4.42 4.83 5.12 5.34 4.54 3.96 4.37 4.73 3.92 3.87 3.70 4.41 3.86
JDA-BON 2.02 2.06 1.97 2.01 1.79 1.79 1.55 1.76 1.93 1.85 1.83 1.53 1.71 1.71 1.63 1.48 1.34 1.60 1.50
Standard errors by reach and year
Reach 2002 2003 2004 2005 2006 2007 2008 2009 2010 2011 2012 2013 2014 2015 2016 2017 2018 2019 2020
LGR-LGS 0.03 0.02 0.01 0.01 0.02 0.03 0.03 0.02 0.02 0.01 0.01 0.02 0.01 0.04 0.01 0.01 0.02 0.03 0.07
LGR-LMN 0.05 0.05 0.05 0.03 0.03 0.05 0.05 0.03 0.06 0.02 0.03 0.03 0.03 0.10 0.02 0.02 0.03 0.04 0.12
LGR-IHR   0.41 2.78 0.09 0.06 0.10 0.07 0.06 0.09 0.04 0.06 0.08 0.06 0.21 0.04 0.06 0.08 0.11 0.18
LGR-MCN 0.08 0.04 0.04 0.03 0.05 0.04 0.07 0.04 0.05 0.04 0.05 0.06 0.03 0.08 0.02 0.06 0.07 0.13 0.16
LGR-JDA 0.12 0.07 0.05 0.07 0.09 0.05 0.09 0.11 0.14 0.05 0.04 0.09 0.05 0.26 0.04 0.05 0.08 0.13 0.15
LGR-BON 0.12 0.08 0.09 0.07 0.10 0.08 0.14 0.09 0.09 0.15 0.10 0.10 0.08 0.12 0.04 0.08 0.11 0.13 0.13
LGS-LMN 0.02 0.01 0.02 0.01 0.01 0.02 0.01 0.01 0.02 0.01 0.01 0.01 0.01 0.04 0.01 0.01 0.01 0.01 0.04
LGS-IHR   0.12 2.54 0.03 0.02 0.05 0.03 0.02 0.04 0.02 0.02 0.03 0.03 0.10 0.02 0.03 0.03 0.05 0.08
LGS-MCN 0.03 0.02 0.02 0.01 0.02 0.03 0.04 0.02 0.02 0.02 0.02 0.03 0.02 0.05 0.01 0.04 0.04 0.07 0.09
LGS-JDA 0.05 0.04 0.04 0.04 0.04 0.04 0.05 0.07 0.09 0.04 0.02 0.05 0.04 0.17 0.03 0.03 0.05 0.09 0.07
LGS-BON 0.06 0.05 0.05 0.04 0.05 0.08 0.09 0.07 0.06 0.10 0.05 0.07 0.07 0.08 0.04 0.07 0.07 0.09 0.09
LMN-IHR   NA 0.53 0.02 0.01 0.02 0.02 0.02 0.03 0.01 0.01 0.02 0.02 0.11 0.02 0.01 0.02 0.02 0.07
LMN-MCN 0.01 0.02 0.02 0.01 0.02 0.02 0.03 0.03 0.03 0.02 0.02 0.03 0.02 0.05 0.02 0.03 0.04 0.05 0.10
LMN-JDA 0.03 0.04 0.07 0.04 0.03 0.03 0.05 0.08 0.10 0.03 0.02 0.06 0.04 0.20 0.03 0.03 0.05 0.06 0.09
LMN-BON 0.03 0.05 0.07 0.04 0.05 0.06 0.08 0.09 0.09 0.10 0.05 0.07 0.07 0.11 0.04 0.07 0.07 0.07 0.10
IHR-MCN   0.31 NA 0.02 0.02 0.02 0.02 0.02 0.01 0.02 0.02 0.02 0.02 0.05 0.02 0.05 0.05 0.07 0.07
IHR-JDA   2.35 NA 0.10 0.04 0.04 0.04 0.08 0.09 0.03 0.03 0.05 0.06 0.15 0.05 0.05 0.07 0.12 0.07
IHR-BON   3.04 4.01 0.10 0.06 0.07 0.07 0.09 0.06 0.11 0.07 0.07 0.09 0.08 0.06 0.09 0.09 0.13 0.08
MCN-JDA 0.01 0.02 0.03 0.02 0.02 0.01 0.02 0.03 0.03 0.02 0.01 0.02 0.02 0.04 0.01 0.02 0.03 0.04 0.03
MCN-BON 0.02 0.02 0.04 0.03 0.03 0.02 0.03 0.02 0.02 0.04 0.02 0.02 0.02 0.02 0.01 0.04 0.04 0.04 0.04
JDA-BON 0.01 0.01 0.01 0.02 0.01 0.01 0.01 0.01 0.01 0.02 0.01 0.01 0.01 0.01 0.01 0.01 0.01 0.01 0.01
Counts by reach and year
Reach 2002 2003 2004 2005 2006 2007 2008 2009 2010 2011 2012 2013 2014 2015 2016 2017 2018 2019 2020
LGR-LGS 3266 5065 25710 21378 4837 2301 5766 8704 2259 9470 11346 4180 10757 1077 12676 5763 5430 2442 340
LGR-LMN 4226 1914 6186 8986 3399 1284 3158 3743 527 8496 6918 1966 5483 256 5861 3986 3394 2207 154
LGR-IHR 0 5 7 744 1303 449 1774 1792 581 3279 2353 540 1467 84 1508 829 507 565 108
LGR-MCN 2878 4900 7335 8424 2267 3814 2821 7032 2653 5373 4377 2474 5622 1014 6028 1513 1221 671 174
LGR-JDA 1376 2699 3213 2334 1337 3700 1956 1534 571 4741 6545 1378 4149 175 3145 3177 1738 747 269
LGR-BON 1287 2365 1834 1807 970 1180 1029 2012 1420 854 1659 967 1794 587 2494 926 785 923 346
LGS-LMN 7837 3289 8497 12257 8795 1237 4641 4793 940 10375 10350 2527 7352 263 5127 4736 4207 2341 152
LGS-IHR 0 2 7 1035 3775 352 2174 2017 914 3953 3672 783 1748 89 1247 989 593 626 73
LGS-MCN 4652 5356 9908 10785 5433 3036 3052 6533 3773 7170 6824 3538 6458 892 5771 2025 1669 745 166
LGS-JDA 2625 3260 3988 3103 3446 2889 2672 1820 875 5844 9407 1984 5443 173 3220 4023 2167 775 257
LGS-BON 2178 2549 2466 2322 2220 908 1103 1860 1919 1139 2631 1239 2007 587 1891 959 997 914 247
LMN-IHR 0 1 5 548 3263 413 1932 1478 414 5097 2635 583 1409 31 1074 938 392 578 55
LMN-MCN 8644 2691 3779 5423 4474 2020 2583 4136 994 6770 4479 1917 4112 448 4611 1751 1225 804 106
LMN-JDA 4001 1923 1083 1726 2953 2018 2166 1308 366 7103 6626 1182 3329 85 2746 3688 1623 882 137
LMN-BON 4198 1327 960 1249 1859 628 974 1242 490 1047 1800 674 1283 282 1751 859 697 1006 174
IHR-MCN 0 13 1 611 2625 1114 2005 2893 1665 3487 2708 1183 1691 194 1528 655 226 301 147
IHR-JDA 0 6 1 160 1920 1088 1645 795 426 3866 2864 610 1039 58 912 1271 297 305 196
IHR-BON 0 3 2 123 1033 312 780 867 874 500 955 399 487 194 563 328 161 344 258
MCN-JDA 4378 5500 1941 1655 2481 9756 2164 2595 1784 5017 5030 2666 4122 549 3400 2373 1158 505 417
MCN-BON 3801 5027 1209 1336 1731 3304 1271 4160 5573 1304 2075 1988 2094 1717 2847 629 574 657 493
JDA-BON 2125 3149 520 419 1199 3608 815 986 1121 901 2253 1060 1511 514 1616 1518 776 856 831

Last Update: Fri Oct 23 18:59:01 2020

Data Courtesy of Pacific States Marine Fisheries Commission

The Snake River Spring/Summer Chinook ESU includes naturally spawned spring/summer-run Chinook salmon originating from the mainstem Snake River and the Tucannon River, Grande Ronde River, Imnaha River, and Salmon River subbasins. It also includes spring/summer-run Chinook salmon from 11 artificial propagation programs: Tucannon River Program, Lostine River Program, Catherine Creek Program, Lookingglass Hatchery Program, Upper Grande Ronde Program, Imnaha River Program, Big Sheep Creek Program, McCall Hatchery Program, Johnson Creek Artificial Propagation Enhancement Program, Pahsimeroi Hatchery Program, and Sawtooth Hatchery Program. Definition implemented by Columbia River DART: March 2015.