DART Bonneville "Quick Look" Adult Steelhead Passage with River Environment and Historical Run Timing

Data Courtesy of U.S. Army Corps of Engineers, NWD

Bonneville Steelhead (1/1-12/31) Project Summary
www.cbr.washington.edu/dart/query/adult_proj_sum

graph DART Bonneville Adult Steelhead Rolling 4 Year Arithmetic Mean
Bonneville Adult Steelhead Rolling 4 Year Arithmetic Mean

Columbia River DART
2025 Adult Passage Bonneville Steelhead Summary for Bonneville
04/28/2025 Last Possible Data Date
Species Date Range 2025
YTD Passage		 2024
YTD Passage		 Percent of
YTD
2024		 2021 - 2024
YTD
4 Year Avg		 Percent of
YTD
4 Year Avg		 2015 - 2024
YTD
10 Year Avg		 Percent of
YTD
10 Year Avg		 Run
Complete2		 2015 - 2024
Total
10 Year Avg		 2015 - 2024
Run
Timing		 Cumulative
Passage
with
4 Year Avg
and
10 Year Avg
Steelhead Jan - Dec 1167 2061 56 % 1875 62 % 2526 46 %   136764 Graph Graph
  1. Data Courtesy of U.S. Army Corps of Engineers.
  2. Month ranges represent the expected date range of passage for the species, estimated from the previous year's passage dates. Explicit date ranges limit the counts to that specific date range. The Chinook Run schedules are reported by USACE, ODFW and the YKFP.
  3. The Run Complete date is the last non-zero date of passage when the species has met the run complete criteria: 2 weeks (14 days) of zero passage for the species.
  4. Shaded rows represent subpopulations of the species as a whole.
  5. Last possible Data Date included is 04/28/2025.
  6. The 10 (or N) Year Averages are calculated by DART for each calendar day of data at each project. For the current year and any given project/month/day, the data from the previous 10 years on that calendar day is summed and divided by the number of non-null data points available. Calendar day averaging was chosen because, historically, data observations begin on a specific calendar day. Calendar day averaging gives different results than day of year averaging. YTD Averages and Total Averages presented in this report are the sum of the calendar day averages.
  7. View the Daily 2025 Bonneville Adult Passage counts.
  8. Click on a Species followed by the symbol to view the DART Adult Passage Data Inventory for the Species at Bonneville for all years, including: number of data points, day range of data, and annual count.

Bonneville Steelhead (6/1-12/31) Adult Passage with 10 Year Average
www.cbr.washington.edu/dart/query/adult_graph_text
www.cbr.washington.edu/dart/query/river_graph_text

graph Daily Passage Bonneville Adult Steelhead June 1 - December 31 with 10 Year Average
Daily Passage Bonneville Adult Steelhead June 1 - December 31 with 10 Year Average
graph Cumulative Daily Passage Bonneville Adult Steelhead June 1 - December 31 with 10 Year Average
Cumulative Daily Passage Bonneville Adult Steelhead June 1 - December 31 with 10 Year Average
graph Normalized Cumulative Passage Bonneville Adult Steelhead June 1 - December 31 with 10 Year Average
Normalized Cumulative Passage Bonneville Adult Steelhead June 1 - December 31 with 10 Year Average
graph Bonneville Water Temperature June 1 - December 31 with 10 Year Average
Bonneville Water Temperature June 1 - December 31 with 10 Year Average
graph Bonneville Outflow June 1 - December 31 with 10 Year Average
Bonneville Outflow June 1 - December 31 with 10 Year Average
graph Bonneville Spill Percent June 1 - December 31 with 10 Year Average
Bonneville Spill Percent June 1 - December 31 with 10 Year Average

Bonneville Steelhead (6/1-12/31) Historical Migration Timing Characteristics
www.cbr.washington.edu/dart/query/adult_hrt

Bonneville Steelhead (6/1-12/31) Historical Migration Timing
Migration Timing Characteristics
Adult Visual Counts Steelhead at Bonneville Dam, 6/1 - 12/31
2015 - 2024
Year Passage Dates Duration
Middle 80%
Days		 Duration
Middle 50%
Days		 Duration
Middle 90%
Days		 Run Size "Today"
(04/29)
Passage %		 View Data Water Supply
NWRFC,NOAA
Apr-Sep
Pct Normal
First 5% 10% 25% 50% 75% 90% 95% Last
2025 1 YTD                       Graph
Table		 90%
Average
(2015 - 2024)		 06/01 07/06 07/14 07/30 08/19 09/09 09/23 10/03 12/31 72.3 42.3 89.7 133339.1 0.0%    
Average
95% CI		 06/01-06/01 07/02-07/09 07/10-07/17 07/26-08/02 08/15-08/22 09/05-09/12 09/20-09/25 09/29-10/06 12/31-12/31       91,169-175,509 0.0-0.0%    
Median
(2015 - 2024)		 06/01 07/06 07/13 07/28 08/19 09/09 09/23 10/03 12/31 72.5 42.5 89 114371.5 0.0%    
Median
95% CI		 06/01-06/01 07/01-07/16 07/11-07/25 07/26-08/10 08/13-08/29 09/04-09/16 09/20-09/29 09/28-10/11 12/31-12/31       75,150-263,513 0-0%    
2024 05/31 07/02 07/11 07/28 08/21 09/08 09/21 09/27 12/30 73 43 88 178759 0.0% Graph
Table		 74%
2023 06/01 07/07 07/14 07/31 08/16 09/04 09/18 09/28 12/31 67 36 84 114104 0.0% Graph
Table		 84%
2022 06/01 07/01 07/09 07/23 08/15 09/09 09/20 09/28 12/31 74 49 90 123345 0.0% Graph
Table		 107%
2021 06/01 07/10 07/17 08/10 08/29 09/14 09/28 10/09 12/31 74 36 92 70502 0.0% Graph
Table		 81%
2020 05/31 07/06 07/14 07/27 08/17 09/08 09/20 09/27 12/30 69 44 84 111192 0.0% Graph
Table		 103%
2019 06/01 07/05 07/12 07/26 08/12 09/04 09/29 10/11 12/31 80 41 99 75150 0.0% Graph
Table		 93%
2018 06/01 07/02 07/11 07/27 08/20 09/11 09/26 10/06 12/31 78 47 97 99222 0.0% Graph
Table		 111%
2017 06/01 07/16 07/25 08/06 08/24 09/13 09/24 10/01 12/31 62 39 78 114639 0.0% Graph
Table		 120%
2016 05/31 06/30 07/10 07/27 08/20 09/15 09/27 10/04 12/30 80 51 97 182965 0.0% Graph
Table		 89%
2015 06/01 07/11 07/20 07/31 08/13 09/05 09/23 10/06 12/31 66 37 88 263513 0.0% Graph
Table		 68% D
  • Year 2025 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