DART Pacific Lamprey Status and Summaries -- In Development

Data Courtesy of Pacific States Marine Fisheries Commission, U.S. Army Corps of Engineers, NWD, Grant County PUD, Yakima Klickitat Fisheries Project.

PIT-tagged Pacific Lamprey Detected in Adult Fishways

Unique PIT-Tagged Pacific Lamprey Detected in Adult Fishways per Year
Adult LadderBonnevilleThe DallesJohn DayMcNaryPriest RapidsRock IslandRocky ReachWellsIce HarborLower MonumentalLittle GooseLower Granite
2026     1      
2025408106899112345115513
2024   3  2311  1
2023 2 1 1 852  
2022   1 231931   
2021 1    14    
202094921  1    
2019498290201569 12111145
2018735402 481 581 14
2017      2577    
2016      1671   3
2015     1      
2014     30  6   
2013 1      7   
2012            
2011            
2010            
2009            
2008       2    
2007            
2006            
2005   2        

PIT-tagged Pacific Lamprey Release and Detection Summaries

Summary visualizations of PIT-tagged Pacific Lamprey release and detection data for all years. The number of Pacific Lamprey detected is dependent on the presence of instream arrays. Click on an image to view full size.

Cumulative counts are binned by year difference between release date and maximum detection date
Year(s) difference between release date and maximum detection date is calculated for each PIT-tagged Pacific Lamprey with detection (interrogation or recapture) for all years of data, 2000-2024. Cumulative counts are binned by year difference.
Individual Release Hydrounits (HUC8) for number released and number detected of unique PIT-tagged Pacific Lamprey for all years
Individual Release Hydrounits (HUC8) are tracked (if more than 500 Pacific Lamprey released in all years) for number released and number detected of unique PIT-tagged Pacific Lamprey for all years, 2000-2024.
Line plot of number of PIT-tagged Pacific Lamprey released by month from 2000 to present.
Line plot of number of PIT-tagged Pacific Lamprey detected by month from 2000 to present.
PIT-tagged Pacific Lamprey release year total stacked histogram by release Hydrounits (HUC8) where more than 500 Pacific Lamprey released in all years.
PIT-tagged Pacific Lamprey percent of release year total stacked histogram by release Hydrounits (HUC8) where more than 500 Pacific Lamprey released in all years.

Adult Visual Count Dataset Inventory for Pacific Lamprey

Columbia River DART
Adult Passage Inventory
Lamprey All Projects
Project Year Range View
Project Year Range View
Bonneville 1946-2025 Year Details All Species
Ice Harbor 1962-2025 Year Details All Species
John Day 1968-2025 Year Details All Species
Little Goose 1999-2024 Year Details All Species
Lower Monumental 1999-2024 Year Details All Species
Lower Granite 1999-2024 Year Details All Species
McNary 1954-2024 Year Details All Species
Priest Rapids 2001-2025 Year Details All Species
Prosser 1996-2025 Year Details All Species
Rock Island 2000-2025 Year Details All Species
Rocky Reach 2000-2024 Year Details All Species
The Dalles 1957-2024 Year Details All Species
Tumwater 2017-2024 Year Details All Species
Wanapum 2006-2025 Year Details All Species
Wells 1998-2024 Year Details All Species

Bonneville Adult Passage

Bonneville Lamprey (1/1-12/31) Project Summary

graph DART Bonneville Adult Lamprey Rolling 4 Year Arithmetic Mean

Bonneville Lamprey (1/1-12/31) Adult Passage with 10 Year Average

graph Daily Passage Bonneville Adult Lamprey January 1 - December 31 with 10 Year Average
graph Cumulative Daily Passage Bonneville Adult Lamprey January 1 - December 31 with 10 Year Average

Bonneville Lamprey (1/1-12/31) Historical Migration Timing Characteristics

Migration Timing Characteristics
Adult Visual Counts Lamprey (daytime) at Bonneville Dam, 1/1 - 12/31
2016 - 2025
Year Passage Dates Duration
Middle 80%
Days		 Duration
Middle 50%
Days		 Duration
Middle 90%
Days		 Run Size "Today (04/19)"
Passage %		 View Data Water Supply
NWRFC,NOAA
Apr-Sep
Pct Normal
First 5% 10% 25% 50% 75% 90% 95% Last
Average
(2016 - 2025)		 03/28 06/06 06/13 06/24 07/07 07/23 08/09 08/18 11/13 58.5 30.2 74.1 38316.6 0.0%    
Average
95% CI		 02/17-05/05 05/30-06/12 06/07-06/18 06/18-06/29 06/30-07/13 07/18-07/27 08/03-08/14 08/14-08/21 11/01-11/24       21,445-55,189 0.0-0.0%    
Median
(2016 - 2025)		 05/03 06/03 06/09 06/24 07/10 07/24 08/08 08/16 11/08 60 30 74 32798.0 0.0%    
Median
95% CI		 01/20-05/17 05/29-06/23 06/05-06/28 06/15-07/07 06/27-07/22 07/17-08/02 08/02-08/19 08/15-08/28 11/02-12/13       17,279-82,577 0-0%    
2025 05/07 05/31 06/04 06/09 06/20 07/14 07/29 08/14 11/02 56 36 76 17279 0.0% Graph
Table		 76%
2024 01/20 06/10 06/16 06/24 07/08 07/29 08/06 08/16 12/02 52 36 68 22096 0.0% Graph
Table		 74%
2023 05/05 06/02 06/08 06/15 07/03 07/17 08/02 08/15 11/05 56 33 75 63953 0.0% Graph
Table		 84%
2022 05/17 06/23 06/28 07/07 07/14 07/29 08/19 08/26 11/04 53 23 65 48941 0.0% Graph
Table		 107%
2021 05/03 06/17 06/22 06/29 07/11 07/23 08/07 08/15 11/12 47 25 60 21111 0.0% Graph
Table		 81%
2020 05/11 06/13 06/19 06/28 07/15 07/27 08/15 08/21 11/02 58 30 70 11915 0.0% Graph
Table		 103%
2019 01/17 06/04 06/11 06/24 07/12 07/26 08/13 08/15 10/20 64 33 73 19455 0.0% Graph
Table		 93%
2018 02/13 05/29 06/05 06/21 06/27 07/17 08/10 08/20 12/13 67 27 84 43500 0.0% Graph
Table		 111%
2017 05/04 05/31 06/07 06/22 07/04 07/19 08/04 08/15 11/24 59 28 77 82577 0.0% Graph
Table		 120%
2016 01/24 05/27 06/07 07/02 07/21 08/01 08/18 08/27 11/23 73 31 93 52339 0.0% Graph
Table		 89%
  • Year 2026 is incomplete. Data presented in Migration Timing Characteristics table is data through today's date.
  • Data Courtesy of U.S. Army Corps of Engineers.
  • Date Calculations:
    1. Query DART database for passage counts by Day of Year (not calendar date).
    2. Based on query results, calculate total number of fish for each year (reported as "Run Size" in table).
    3. Based on query results, calculate cumulative number of fish by day in the year.
    4. Based on query results, calculate the Day of Year when fish passage % is equal to or greater than the target percent, e.g., 5% passage. Passage % for a day = cumulative number of fish for day / total fish in year.
    5. For each individual year target passage percent, first date, and last date results: convert Day of Year to Calendar Date for given year, taking into consideration leap year. Report calendar date in table.
    6. For each individual year middle run duration: 80% duration = 1 + (90% Day of Year - 10% Day of Year), 50% duration = 1 + (75% Day of Year - 25% Day of Year), 90% duration = 1 + (95% Day of Year - 5% Day of Year). Report days in table.
    7. For each target passage percent, first date, and last date: calculate average Day of Year for that passage target percent from each individual year Day of Year values. Convert result into integer. Treat integer as Day of Year and convert into Calendar Date for a non-leap year. Report as Average.
    8. For each target passage percent, first date, and last date: calculate median Day of Year for that passage target percent from individual Day of Year values. Convert median Day of Year into Calendar Date for a non-leap year. Report as Median.
    9. Individual year calendar date values reported in table honor leap year. Calculated calendar date values (Average and Median) treat results as non-leap year dates.
  • Water Supply historical, current, and forecast data provided courtesy of Northwest River Forecast Center, NOAA. In the Migration Timing Table, after the percent normal value the 'W' indicates the year is ranked as one of the 5 wettest years for Apr-Sep. The 'D' indicates the year is ranked as one of the 5 driest years for Apr-Sep.

Lower Granite Adult Passage

Lower Granite Lamprey (1/1-12/31) Project Summary

graph DART Lower Granite Adult Lamprey Rolling 4 Year Arithmetic Mean

Lower Granite Lamprey (1/1-12/31) Adult Passage with 10 Year Average

graph Daily Passage Lower Granite Adult Lamprey January 1 - December 31 with 10 Year Average
graph Cumulative Daily Passage Lower Granite Adult Lamprey January 1 - December 31 with 10 Year Average

Lower Granite Lamprey (1/1-12/31) Historical Migration Timing Characteristics

Migration Timing Characteristics
Adult Visual Counts Lamprey (daytime) at Lower Granite Dam, 1/1 - 12/31
2016 - 2025
Year Passage Dates Duration
Middle 80%
Days		 Duration
Middle 50%
Days		 Duration
Middle 90%
Days		 Run Size "Today (04/19)"
Passage %		 View Data Water Supply
NWRFC,NOAA
Apr-Sep
Pct Normal
First 5% 10% 25% 50% 75% 90% 95% Last
Average
(2016 - 2025)		 06/03 07/08 07/17 07/25 08/06 08/18 09/02 09/09 09/30 47.9 25.3 64.1 237.0 0.4%    
Average
95% CI		 05/09-06/27 06/29-07/16 07/11-07/22 07/18-07/31 07/29-08/13 08/12-08/23 08/28-09/06 09/04-09/13 09/22-10/07       104-370 -0.3-1.1%    
Median
(2016 - 2025)		 06/16 07/08 07/17 07/22 08/04 08/17 09/01 09/08 10/04 46 25.5 62.5 215.5 0.0%    
Median
95% CI		 04/05-07/02 06/28-07/30 07/10-08/06 07/17-08/16 07/27-08/27 08/12-09/05 08/30-09/19 09/02-09/24 09/18-10/19       34-631 0-3%    
2025 05/30 07/06 07/10 07/16 07/27 08/10 08/26 09/01 10/04 48 26 58 313 0.0% Graph
Table		 79%
2024 06/26 07/10 07/19 07/29 08/09 08/22 08/30 09/10 10/04 43 25 63 364 0.0% Graph
Table		 82%
2023 06/06 07/13 07/17 07/22 08/08 08/17 08/31 09/13 10/19 46 27 63 631 0.0% Graph
Table		 96%
2022 06/29 07/30 08/06 08/16 08/27 09/05 09/19 09/24 10/09 45 21 57 220 0.0% Graph
Table		 96%
2021 04/01 06/15 07/17 07/22 08/05 08/18 09/01 09/02 09/17 47 28 80 34 2.9% Graph
Table		 66%
2020 06/28 07/05 07/16 08/01 08/17 08/24 09/03 09/03 09/19 50 24 61 28 0.0% Graph
Table		 98%
2019 04/05 06/28 07/09 07/18 08/04 08/17 09/01 09/10 09/25 55 31 75 96 1.0% Graph
Table		 115%
2018 06/23 07/09 07/12 07/17 07/26 08/12 09/01 09/07 10/04 52 27 61 211 0.0% Graph
Table		 115%
2017 07/02 07/16 07/19 07/23 07/31 08/13 09/01 09/14 10/07 45 22 61 354 0.0% Graph
Table		 140%
2016 06/09 07/06 07/13 07/25 08/03 08/15 08/29 09/05 09/17 48 22 62 119 0.0% Graph
Table		 82%
  • Year 2026 is incomplete. Data presented in Migration Timing Characteristics table is data through today's date.
  • Data Courtesy of U.S. Army Corps of Engineers.
  • Date Calculations:
    1. Query DART database for passage counts by Day of Year (not calendar date).
    2. Based on query results, calculate total number of fish for each year (reported as "Run Size" in table).
    3. Based on query results, calculate cumulative number of fish by day in the year.
    4. Based on query results, calculate the Day of Year when fish passage % is equal to or greater than the target percent, e.g., 5% passage. Passage % for a day = cumulative number of fish for day / total fish in year.
    5. For each individual year target passage percent, first date, and last date results: convert Day of Year to Calendar Date for given year, taking into consideration leap year. Report calendar date in table.
    6. For each individual year middle run duration: 80% duration = 1 + (90% Day of Year - 10% Day of Year), 50% duration = 1 + (75% Day of Year - 25% Day of Year), 90% duration = 1 + (95% Day of Year - 5% Day of Year). Report days in table.
    7. For each target passage percent, first date, and last date: calculate average Day of Year for that passage target percent from each individual year Day of Year values. Convert result into integer. Treat integer as Day of Year and convert into Calendar Date for a non-leap year. Report as Average.
    8. For each target passage percent, first date, and last date: calculate median Day of Year for that passage target percent from individual Day of Year values. Convert median Day of Year into Calendar Date for a non-leap year. Report as Median.
    9. Individual year calendar date values reported in table honor leap year. Calculated calendar date values (Average and Median) treat results as non-leap year dates.
  • Water Supply historical, current, and forecast data provided courtesy of Northwest River Forecast Center, NOAA. In the Migration Timing Table, after the percent normal value the 'W' indicates the year is ranked as one of the 5 wettest years for Apr-Sep. The 'D' indicates the year is ranked as one of the 5 driest years for Apr-Sep.

Prosser Adult Passage

Prosser Lamprey (1/1-12/31) Project Summary

graph DART Prosser Adult Lamprey Rolling 4 Year Arithmetic Mean

Prosser Lamprey (1/1-12/31) Adult Passage with 10 Year Average

graph Daily Passage Prosser Adult Lamprey January 1 - December 31 with 10 Year Average
graph Cumulative Daily Passage Prosser Adult Lamprey January 1 - December 31 with 10 Year Average

Prosser Lamprey (1/1-12/31) Historical Migration Timing Characteristics

Migration Timing Characteristics
Adult Visual Counts Lamprey (daytime) at Prosser Diversion, 1/1 - 12/31
2016 - 2025
Year Passage Dates Duration
Middle 80%
Days		 Duration
Middle 50%
Days		 Duration
Middle 90%
Days		 Run Size "Today (04/19)"
Passage %		 View Data
First 5% 10% 25% 50% 75% 90% 95% Last
2026 1 YTD 04/08               04/08       6 (YTD)   Graph
Table
Average
(2016 - 2025)		 04/11 04/17 04/19 04/23 05/01 05/10 05/31 06/17 08/09 43.0 17.5 61.5 146.1 17.7%  
Average
95% CI		 04/05-04/16 04/10-04/23 04/13-04/24 04/18-04/27 04/24-05/07 05/01-05/18 04/24-07/06 05/10-07/24 06/24-09/23       -16-309 -4.6-40.1%  
Median
(2016 - 2025)		 04/10 04/21 04/21 04/25 05/03 05/12 05/17 05/29 09/02 26.5 17 38 36.0 2.0%  
Median
95% CI		 04/03-04/25 04/09-04/27 04/12-04/30 04/17-05/04 04/22-05/16 04/30-06/03 05/13-10/18 05/20-10/18 05/31-10/18       4-710 0-100%  
2025 04/16 04/22 04/22 04/22 04/22 04/30 05/13 05/24 10/09 22 9 33 330 0.9% Graph
Table
2024 04/02 04/02 04/11 04/16 05/03 05/11 05/17 05/26 09/30 37 26 55 20 25.0% Graph
Table
2023 04/15 04/26 04/27 04/29 05/16 05/16 05/17 05/20 06/08 21 18 25 89 2.2% Graph
Table
2022 04/25 04/25 04/25 04/25 04/25 06/03 10/18 10/18 10/18 177 40 177 4 0.0% Graph
Table
2021 04/12 04/12 04/12 04/12 04/12 04/16 04/16 04/16 04/16 5 5 5 3 100.0% Graph
Table
2020 04/08 04/08 04/13 04/18 05/09 05/11 05/31 07/17 07/17 49 24 101 15 33.3% Graph
Table
2019 04/20 04/20 04/20 04/25 05/02 05/07 05/31 05/31 05/31 42 13 42 7 0.0% Graph
Table
2018 04/09 04/27 04/30 04/30 05/06 05/13 05/17 05/24 09/03 18 14 28 231 0.4% Graph
Table
2017 04/07 04/22 04/26 05/04 05/05 05/18 05/21 05/31 09/02 26 15 40 710 1.7% Graph
Table
2016 04/02 04/09 04/10 04/24 05/02 05/04 05/12 07/26 09/18 33 11 109 52 13.5% Graph
Table
  • Year 2026 is incomplete. Data presented in Migration Timing Characteristics table is data through today's date.
  • Data Courtesy of Yakima Klickitat Fisheries Project.
  • Date Calculations:
    1. Query DART database for passage counts by Day of Year (not calendar date).
    2. Based on query results, calculate total number of fish for each year (reported as "Run Size" in table).
    3. Based on query results, calculate cumulative number of fish by day in the year.
    4. Based on query results, calculate the Day of Year when fish passage % is equal to or greater than the target percent, e.g., 5% passage. Passage % for a day = cumulative number of fish for day / total fish in year.
    5. For each individual year target passage percent, first date, and last date results: convert Day of Year to Calendar Date for given year, taking into consideration leap year. Report calendar date in table.
    6. For each individual year middle run duration: 80% duration = 1 + (90% Day of Year - 10% Day of Year), 50% duration = 1 + (75% Day of Year - 25% Day of Year), 90% duration = 1 + (95% Day of Year - 5% Day of Year). Report days in table.
    7. For each target passage percent, first date, and last date: calculate average Day of Year for that passage target percent from each individual year Day of Year values. Convert result into integer. Treat integer as Day of Year and convert into Calendar Date for a non-leap year. Report as Average.
    8. For each target passage percent, first date, and last date: calculate median Day of Year for that passage target percent from individual Day of Year values. Convert median Day of Year into Calendar Date for a non-leap year. Report as Median.
    9. Individual year calendar date values reported in table honor leap year. Calculated calendar date values (Average and Median) treat results as non-leap year dates.

Priest Rapids Adult Passage

Priest Rapids Lamprey (1/1-12/31) Project Summary

graph DART Priest Rapids Adult Lamprey Rolling 4 Year Arithmetic Mean

Priest Rapids Lamprey (1/1-12/31) Adult Passage with 10 Year Average

graph Daily Passage Priest Rapids Adult Lamprey January 1 - December 31 with 10 Year Average
graph Cumulative Daily Passage Priest Rapids Adult Lamprey January 1 - December 31 with 10 Year Average

Priest Rapids Lamprey (1/1-12/31) Historical Migration Timing Characteristics

Migration Timing Characteristics
Adult Visual Counts Lamprey (daytime) at Priest Rapids Dam, 1/1 - 12/31
2016 - 2025
Year Passage Dates Duration
Middle 80%
Days		 Duration
Middle 50%
Days		 Duration
Middle 90%
Days		 Run Size "Today (04/19)"
Passage %		 View Data Water Supply
NWRFC,NOAA
Apr-Sep
Pct Normal
First 5% 10% 25% 50% 75% 90% 95% Last
Average
(2016 - 2025)		 05/10 07/01 07/11 07/25 08/09 08/24 09/09 09/19 11/13 60.3 31.3 80.4 8831.6 0.0%    
Average
95% CI		 05/03-05/16 06/22-07/09 07/04-07/17 07/19-07/30 08/02-08/15 08/18-08/29 09/02-09/15 09/12-09/25 11/11-11/14       3,615-14,049 0.0-0.0%    
Median
(2016 - 2025)		 05/13 06/28 07/10 07/25 08/08 08/24 09/07 09/15 11/14 59 30 79.5 7423.5 0.0%    
Median
95% CI		 04/30-05/22 06/24-07/30 07/04-08/04 07/19-08/14 07/30-08/25 08/16-09/07 09/02-09/27 09/12-10/09 11/12-11/16       2,482-26,012 0-0%    
2025 05/04 07/02 07/10 07/19 07/30 08/16 08/30 09/09 11/15 52 29 70 3873 0.0% Graph
Table		 77%
2024 05/13 06/29 07/11 07/27 08/09 08/19 09/02 09/12 11/15 54 24 76 6708 0.0% Graph
Table		 71% D
2023 05/15 06/27 07/11 07/25 08/08 08/23 09/07 09/15 11/14 59 30 81 13153 0.0% Graph
Table		 78%
2022 04/30 07/30 08/04 08/14 08/25 09/03 09/17 09/25 11/10 45 21 58 11163 0.0% Graph
Table		 111%
2021 05/22 06/25 07/06 07/19 08/04 08/30 09/14 09/26 11/13 71 43 94 2482 0.0% Graph
Table		 86%
2020 05/15 06/23 07/01 07/25 08/21 09/06 09/26 10/08 11/14 88 44 108 1750 0.0% Graph
Table		 106%
2019 05/12 06/25 07/08 07/27 08/15 08/28 09/08 09/16 11/12 63 33 84 3278 0.0% Graph
Table		 83%
2018 05/09 06/21 07/04 07/16 07/30 08/14 09/02 09/13 11/12 61 30 85 11758 0.0% Graph
Table		 113%
2017 05/20 07/15 07/18 07/24 08/04 08/19 09/03 09/12 11/15 48 27 60 26012 0.0% Graph
Table		 114%
2016 04/23 06/28 07/10 07/25 08/08 08/25 09/09 09/23 11/15 62 32 88 8139 0.0% Graph
Table		 91%
  • Year 2026 is incomplete. Data presented in Migration Timing Characteristics table is data through today's date.
  • Data Courtesy of U.S. Army Corps of Engineers.
  • Date Calculations:
    1. Query DART database for passage counts by Day of Year (not calendar date).
    2. Based on query results, calculate total number of fish for each year (reported as "Run Size" in table).
    3. Based on query results, calculate cumulative number of fish by day in the year.
    4. Based on query results, calculate the Day of Year when fish passage % is equal to or greater than the target percent, e.g., 5% passage. Passage % for a day = cumulative number of fish for day / total fish in year.
    5. For each individual year target passage percent, first date, and last date results: convert Day of Year to Calendar Date for given year, taking into consideration leap year. Report calendar date in table.
    6. For each individual year middle run duration: 80% duration = 1 + (90% Day of Year - 10% Day of Year), 50% duration = 1 + (75% Day of Year - 25% Day of Year), 90% duration = 1 + (95% Day of Year - 5% Day of Year). Report days in table.
    7. For each target passage percent, first date, and last date: calculate average Day of Year for that passage target percent from each individual year Day of Year values. Convert result into integer. Treat integer as Day of Year and convert into Calendar Date for a non-leap year. Report as Average.
    8. For each target passage percent, first date, and last date: calculate median Day of Year for that passage target percent from individual Day of Year values. Convert median Day of Year into Calendar Date for a non-leap year. Report as Median.
    9. Individual year calendar date values reported in table honor leap year. Calculated calendar date values (Average and Median) treat results as non-leap year dates.
  • Water Supply historical, current, and forecast data provided courtesy of Northwest River Forecast Center, NOAA. In the Migration Timing Table, after the percent normal value the 'W' indicates the year is ranked as one of the 5 wettest years for Apr-Sep. The 'D' indicates the year is ranked as one of the 5 driest years for Apr-Sep.

Query Notes and Methods