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Adult Snake River Chinook Fall 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.


Arithmetic mean travel times by reach and year
Reach 2002 2003 2004 2005 2006 2007 2008 2009 2010 2011 2012 2013 2014 2015 2016 2017
BON-MCN 7.44 7.00 6.18 5.99 6.74 6.33 6.87 6.17 6.34 6.27 6.07 7.67 5.99 6.51 6.68 7.01
BON-IHR   8.84 7.94 8.27 8.66 8.37 8.99 8.18 8.20 8.15 8.08 9.83 7.99 8.55 8.72 8.92
BON-LGR 14.28 13.89 12.36 13.10 14.45 13.32 16.03 15.56 14.44 14.87 13.88 18.25 15.51 17.12 21.94 14.53
BON-TDA                       2.75 2.12 2.22 2.62 2.65
BON-LMN                         9.94 10.23 10.55 10.53
BON-LGS                         13.13 13.87 16.27 13.20
TDA-MCN                       4.82 3.82 4.03 4.13 4.37
TDA-IHR                       7.01 5.83 6.08 6.18 6.30
TDA-LMN                         7.79 7.76 8.00 7.93
TDA-LGS                         11.01 11.51 13.96 10.54
TDA-LGR                       15.44 13.38 14.77 19.50 11.85
MCN-IHR   1.95 1.57 1.84 1.88 2.14 2.03 1.98 1.74 1.79 1.89 2.10 1.94 1.98 1.86 1.91
MCN-LGR 7.12 7.38 6.11 6.96 7.69 7.31 9.27 9.44 8.20 8.66 7.88 10.59 9.62 10.82 15.31 7.51
MCN-LMN                         3.94 3.66 3.80 3.51
MCN-LGS                         7.20 7.51 9.84 6.18
IHR-LGR   5.36 4.49 4.99 5.83 5.23 7.18 7.46 6.30 6.77 5.94 8.49 7.65 8.86 13.40 5.77
IHR-LMN                         1.87 1.65 1.87 1.59
IHR-LGS                         5.22 5.52 7.87 4.40
LMN-LGS                         3.09 3.70 5.99 2.76
LMN-LGR                         5.72 7.04 11.71 4.14
LGS-LGR                         1.69 4.14 6.37 1.24
Standard errors by reach and year
Reach 2002 2003 2004 2005 2006 2007 2008 2009 2010 2011 2012 2013 2014 2015 2016 2017
BON-MCN 0.43 0.25 0.18 0.18 0.19 0.13 0.06 0.05 0.06 0.05 0.05 0.09 0.05 0.07 0.11 0.13
BON-IHR   0.25 0.24 0.31 0.20 0.13 0.06 0.07 0.06 0.06 0.05 0.09 0.06 0.08 0.14 0.16
BON-LGR 0.49 0.31 0.30 0.34 0.46 0.17 0.18 0.21 0.14 0.18 0.11 0.16 0.17 0.27 0.62 0.28
BON-TDA                       0.05 0.03 0.06 0.08 0.09
BON-LMN                         0.08 0.09 0.18 0.17
BON-LGS                         0.17 0.23 0.44 0.28
TDA-MCN                       0.08 0.04 0.04 0.08 0.09
TDA-IHR                       0.07 0.05 0.06 0.11 0.12
TDA-LMN                         0.07 0.07 0.16 0.13
TDA-LGS                         0.17 0.23 0.43 0.23
TDA-LGR                       0.16 0.17 0.27 0.61 0.20
MCN-IHR   0.17 0.04 0.24 0.06 0.07 0.02 0.05 0.05 0.03 0.04 0.04 0.04 0.04 0.05 0.08
MCN-LGR 0.49 0.23 0.19 0.20 0.39 0.16 0.17 0.20 0.13 0.17 0.10 0.15 0.16 0.27 0.60 0.17
MCN-LMN                         0.06 0.05 0.13 0.09
MCN-LGS                         0.16 0.22 0.42 0.21
IHR-LGR   0.15 0.14 0.17 0.39 0.14 0.16 0.20 0.13 0.16 0.09 0.14 0.17 0.26 0.60 0.16
IHR-LMN                         0.06 0.04 0.14 0.05
IHR-LGS                         0.16 0.21 0.42 0.20
LMN-LGS                         0.16 0.21 0.43 0.20
LMN-LGR                         0.16 0.25 0.61 0.16
LGS-LGR                         0.26 0.25 0.57 0.30
Counts by reach and year
Reach 2002 2003 2004 2005 2006 2007 2008 2009 2010 2011 2012 2013 2014 2015 2016 2017
BON-MCN 74 173 255 139 194 601 2828 2504 2724 2598 3568 3806 2785 1657 846 571
BON-IHR 0 172 255 137 190 579 2795 2452 2679 2535 3445 3605 2738 1624 841 557
BON-LGR 86 162 251 134 186 561 1773 2089 2252 2166 3068 3098 2249 1234 559 330
BON-TDA 0 0 0 0 0 0 0 0 0 0 0 4688 3410 1988 1006 687
BON-LMN 0 0 0 0 0 0 0 0 0 0 0 0 2689 1607 820 555
BON-LGS 0 0 0 0 0 0 0 0 0 0 0 0 2487 1408 672 412
TDA-MCN 0 0 0 0 0 0 0 0 0 0 0 3803 2786 1662 885 582
TDA-IHR 0 0 0 0 0 0 0 0 0 0 0 3601 2739 1627 879 568
TDA-LMN 0 0 0 0 0 0 0 0 0 0 0 0 2691 1611 859 566
TDA-LGS 0 0 0 0 0 0 0 0 0 0 0 0 2488 1410 701 417
TDA-LGR 0 0 0 0 0 0 0 0 0 0 0 3097 2247 1233 575 334
MCN-IHR 0 210 307 137 192 578 2790 2436 2674 2541 3453 3595 2740 1629 874 573
MCN-LGR 84 199 301 133 188 560 1765 2071 2250 2173 3072 3090 2250 1236 570 339
MCN-LMN 0 0 0 0 0 0 0 0 0 0 0 0 2691 1613 856 571
MCN-LGS 0 0 0 0 0 0 0 0 0 0 0 0 2489 1413 696 422
IHR-LGR 0 207 303 133 186 557 1781 2080 2247 2163 3071 3082 2246 1235 573 337
IHR-LMN 0 0 0 0 0 0 0 0 0 0 0 0 2689 1609 857 566
IHR-LGS 0 0 0 0 0 0 0 0 0 0 0 0 2486 1410 699 420
LMN-LGS 0 0 0 0 0 0 0 0 0 0 0 0 2467 1404 693 419
LMN-LGR 0 0 0 0 0 0 0 0 0 0 0 0 2232 1229 568 336
LGS-LGR 0 0 0 0 0 0 0 0 0 0 0 0 2242 1231 575 337

Last Update: Sun Oct 22 18:59:02 2017

Data Courtesy of Pacific States Marine Fisheries Commission

The Snake River Fall Chinook ESU includes naturally spawned fall-run Chinook salmon originating from the mainstem Snake River below Hells Canyon Dam and from the Tucannon River, Grande Ronde River, Imnaha River, Salmon River, and Clearwater River subbasins. Also, fall-run Chinook salmon from four artificial propagation programs: Lyons Ferry Hatchery Program, Fall Chinook Acclimation Ponds Program, Nez Perce Tribal Hatchery Program, and Oxbow Hatchery Program. Definition implemented by Columbia River DART: June 2007.