DART Pacific Lamprey Summaries Prosser -- In Development

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

Adult Lamprey Summaries

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 (05/30)"
Passage %		 View Data
First 5% 10% 25% 50% 75% 90% 95% Last
2026 1 YTD 04/08               05/20       121 (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 89.6%  
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 79.0-100.1%  
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 94.8%  
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 86-100%  
2025 04/16 04/22 04/22 04/22 04/22 04/30 05/13 05/24 10/09 22 9 33 330 98.5% 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 95.0% 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 97.8% 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 50.0% 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 86.7% 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 85.7% 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 97.4% 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 94.5% 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 90.4% 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.

Query Notes and Methods