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Adult Snake River Steelhead DPS 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 2021 2022
BON-MCN 14.15 17.72 13.84 12.96 15.86 12.15 13.27 13.92 12.23 10.56 10.99 13.49 12.25 12.16 11.11 14.64 12.74 15.35 12.66 11.43 13.49
BON-IHR   24.41 18.13 18.90 21.12 18.62 17.65 19.15 16.80 14.63 18.22 19.05 17.08 17.25 14.77 19.55 17.77 20.69 17.47 15.20 17.62
BON-LGR 27.11 36.61 28.00 29.95 31.70 33.79 30.55 30.72 27.67 23.38 27.50 32.38 27.76 28.49 24.42 28.04 27.73 32.75 28.01 24.98 30.68
BON-TDA                       3.95 3.44 3.40 3.27 4.78 3.86 4.04 3.36 3.45 4.30
BON-JDA                                 7.40 9.64 7.71 6.31 8.20
BON-LMN                         20.20 20.99 17.37 22.40 21.43 25.19 21.13 18.53 21.16
BON-LGS                         23.30 24.69 21.63 25.63 24.62 28.81 24.18 20.86 25.36
TDA-JDA                                 1.66 1.83 2.12 1.53 1.70
TDA-MCN                       5.44 6.12 5.57 5.49 5.91 5.66 5.70 6.26 5.28 5.32
TDA-IHR                       8.93 9.80 9.11 8.51 9.22 9.26 8.83 9.90 8.17 7.85
TDA-LMN                         12.55 12.06 10.78 11.57 12.13 11.47 12.85 10.77 10.28
TDA-LGS                         15.14 14.94 13.71 13.95 14.80 14.55 15.53 13.09 12.66
TDA-LGR                       18.27 18.98 18.42 16.43 16.78 17.74 17.20 18.40 15.86 16.07
JDA-MCN                                 3.17 2.88 3.01 3.00 2.95
JDA-IHR                                 6.22 5.30 5.80 5.51 5.20
JDA-LMN                                 8.84 7.49 8.32 7.89 7.49
JDA-LGS                                 11.27 9.99 10.65 10.01 9.67
JDA-LGR                                 14.14 12.33 13.27 12.58 12.82
MCN-IHR   2.30 1.99 2.47 2.49 2.78 2.50 2.42 2.54 2.51 3.20 2.31 2.47 2.41 2.25 2.30 2.54 2.08 2.25 2.12 1.99
MCN-LGR 8.68 9.20 8.43 10.57 10.01 11.88 11.01 10.21 10.62 9.98 12.11 10.09 10.78 10.53 9.64 9.18 10.46 9.02 9.68 9.11 9.57
MCN-LMN                         5.02 4.96 4.62 4.39 5.07 4.19 4.74 4.48 4.23
MCN-LGS                         7.44 7.45 7.04 6.52 7.54 6.62 7.08 6.61 6.47
IHR-LGR   6.15 5.99 7.00 6.68 7.46 7.76 6.92 7.16 6.68 7.04 6.99 7.43 7.26 6.85 6.41 7.26 6.39 6.67 6.47 6.92
IHR-LMN                         2.11 2.07 2.02 1.78 2.11 1.83 2.01 2.00 1.89
IHR-LGS                         4.34 4.38 4.25 3.84 4.43 4.01 4.15 4.04 4.01
LMN-LGS                         1.94 2.02 1.91 1.84 2.08 1.96 1.84 1.76 1.86
LMN-LGR                         4.88 4.86 4.47 4.40 4.95 4.38 4.31 4.13 4.74
LGS-LGR                         2.54 2.51 2.37 2.27 2.60 2.20 2.16 2.16 2.47
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 2021 2022
BON-MCN 0.29 0.66 0.48 0.51 0.83 0.30 0.28 0.22 0.16 0.12 0.17 0.31 0.20 0.23 0.25 0.56 0.43 0.70 0.35 0.45 0.40
BON-IHR   0.83 0.59 0.76 1.05 0.52 0.36 0.30 0.23 0.19 0.38 0.43 0.27 0.34 0.33 0.69 0.60 0.91 0.50 0.53 0.53
BON-LGR 0.46 1.00 0.77 1.02 1.36 0.87 0.66 0.42 0.37 0.29 0.50 0.65 0.41 0.49 0.52 0.84 0.85 1.24 0.79 0.89 1.18
BON-TDA                       0.08 0.05 0.06 0.06 0.19 0.13 0.16 0.08 0.12 0.14
BON-JDA                                 0.29 0.58 0.26 0.26 0.29
BON-LMN                         0.31 0.39 0.38 0.74 0.70 1.11 0.62 0.66 0.63
BON-LGS                         0.35 0.46 0.52 0.92 0.83 1.09 0.66 0.66 0.86
TDA-JDA                                 0.05 0.07 0.06 0.04 0.04
TDA-MCN                       0.08 0.07 0.07 0.08 0.14 0.14 0.17 0.14 0.14 0.10
TDA-IHR                       0.15 0.13 0.13 0.14 0.23 0.24 0.26 0.24 0.21 0.16
TDA-LMN                         0.16 0.17 0.16 0.27 0.31 0.33 0.30 0.26 0.22
TDA-LGS                         0.19 0.21 0.22 0.33 0.39 0.44 0.37 0.31 0.32
TDA-LGR                       0.32 0.24 0.25 0.25 0.39 0.45 0.50 0.42 0.36 0.43
JDA-MCN                                 0.05 0.05 0.04 0.05 0.04
JDA-IHR                                 0.12 0.10 0.10 0.10 0.09
JDA-LMN                                 0.19 0.14 0.15 0.14 0.14
JDA-LGS                                 0.24 0.21 0.20 0.19 0.23
JDA-LGR                                 0.31 0.25 0.25 0.23 0.33
MCN-IHR   0.04 0.03 0.07 0.09 0.06 0.04 0.03 0.03 0.03 0.06 0.04 0.03 0.03 0.03 0.05 0.06 0.04 0.05 0.05 0.04
MCN-LGR 0.11 0.15 0.14 0.32 0.31 0.27 0.19 0.11 0.12 0.12 0.20 0.17 0.13 0.12 0.13 0.18 0.24 0.20 0.20 0.19 0.26
MCN-LMN                         0.06 0.06 0.07 0.09 0.12 0.09 0.10 0.10 0.09
MCN-LGS                         0.09 0.09 0.11 0.13 0.18 0.16 0.15 0.14 0.17
IHR-LGR   0.09 0.09 0.18 0.19 0.14 0.13 0.07 0.07 0.07 0.08 0.10 0.08 0.07 0.09 0.13 0.16 0.15 0.12 0.13 0.18
IHR-LMN                         0.02 0.02 0.03 0.03 0.05 0.04 0.04 0.05 0.04
IHR-LGS                         0.04 0.05 0.06 0.07 0.10 0.10 0.08 0.09 0.10
LMN-LGS                         0.02 0.02 0.03 0.04 0.05 0.05 0.04 0.04 0.05
LMN-LGR                         0.05 0.05 0.06 0.10 0.12 0.12 0.08 0.09 0.13
LGS-LGR                         0.03 0.03 0.04 0.06 0.07 0.06 0.04 0.05 0.06
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 2021 2022
BON-MCN 1210 664 577 391 257 925 1152 2602 2529 2210 1485 1247 1935 1608 974 474 473 416 671 396 552
BON-IHR 0 630 572 378 234 790 1065 2369 2355 2095 1375 1167 1837 1521 928 461 449 398 624 375 480
BON-LGR 1086 597 553 344 199 643 868 2099 2099 1826 1206 1040 1653 1404 849 399 381 359 573 348 307
BON-TDA 0 0 0 0 0 0 0 0 0 0 0 1463 2225 1845 1123 533 554 478 770 437 695
BON-JDA 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 503 434 704 411 603
BON-LMN 0 0 0 0 0 0 0 0 0 0 0 0 1769 1480 849 445 430 395 605 363 424
BON-LGS 0 0 0 0 0 0 0 0 0 0 0 0 1689 1441 876 427 394 374 582 345 357
TDA-JDA 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 525 450 709 424 612
TDA-MCN 0 0 0 0 0 0 0 0 0 0 0 1252 1949 1630 1007 482 490 434 676 406 558
TDA-IHR 0 0 0 0 0 0 0 0 0 0 0 1175 1848 1538 961 468 465 412 626 385 486
TDA-LMN 0 0 0 0 0 0 0 0 0 0 0 0 1782 1499 877 452 445 407 607 371 430
TDA-LGS 0 0 0 0 0 0 0 0 0 0 0 0 1696 1456 893 430 407 387 584 353 361
TDA-LGR 0 0 0 0 0 0 0 0 0 0 0 1046 1658 1423 865 404 392 367 573 352 309
JDA-MCN 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 489 436 689 415 559
JDA-IHR 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 463 414 638 395 486
JDA-LMN 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 445 408 617 379 428
JDA-LGS 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 407 387 592 361 360
JDA-LGR 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 392 368 581 360 308
MCN-IHR 0 673 621 398 248 799 1086 2400 2410 2191 1450 1204 1865 1575 998 503 462 427 650 402 495
MCN-LGR 1116 654 599 370 212 647 881 2123 2128 1907 1266 1069 1672 1446 897 433 390 378 593 365 315
MCN-LMN 0 0 0 0 0 0 0 0 0 0 0 0 1800 1534 914 487 444 418 629 386 438
MCN-LGS 0 0 0 0 0 0 0 0 0 0 0 0 1703 1484 929 460 405 397 604 367 368
IHR-LGR 0 640 599 367 215 645 886 2139 2156 1924 1303 1090 1689 1458 915 443 394 380 589 375 316
IHR-LMN 0 0 0 0 0 0 0 0 0 0 0 0 1824 1550 930 496 449 423 626 396 437
IHR-LGS 0 0 0 0 0 0 0 0 0 0 0 0 1710 1498 943 471 409 399 601 377 367
LMN-LGS 0 0 0 0 0 0 0 0 0 0 0 0 1710 1523 906 478 418 407 604 380 375
LMN-LGR 0 0 0 0 0 0 0 0 0 0 0 0 1686 1479 889 451 404 387 594 378 321
LGS-LGR 0 0 0 0 0 0 0 0 0 0 0 0 1656 1510 951 461 411 406 603 386 322

Last Update: Tue Oct 4 18:59:01 2022

Data Courtesy of Pacific States Marine Fisheries Commission

The Snake River Steelhead DPS includes naturally spawned anadromous O. mykiss (steelhead) originating below natural and manmade impassable barriers from the Snake River basin, and also steelhead from six artificial propagation programs: Tucannon River Program, Dworshak National Fish Hatchery Program, Lolo Creek Program, North Fork Clearwater Program, East Fork Salmon River Program, and Little Sheep Creek/Imnaha River Hatchery Program (Oregon Department of Fish and Wildlife Stock #29). Definition implemented by Columbia River DART: March 2010.