Columbia Basin Performance Measures

Adult Passage Exposure Results

Adult Chinook Query Parameters

Year	2025
Project	Bonneville
River Parameter	Tailrace TDG Percent
Critical Tailrace TDG Percent Value	120 %
Calculate Exposure	Above Critical Value
River Parameter Data Fill	No
Query Dates	3/15 - 6/15

Total Run Period (Mar 15 - Jun 15)

Total Number of Fish Observed	146061
Percent of Total Run Analyzed [Number Observed]	100 % [146061]
Tailrace TDG Percent Exposure Index	121.3 %
Percent of Fish Exposed [Number Exposed]	93.8 % [137143]
Number of Days Fish Exposed	62

Middle 80% of Run Period (Apr 26 - Jun 8)

Number of Fish Observed	121376
Percent of Middle 80% of Run Analyzed [Number Observed]	100 % [121376]
Tailrace TDG Percent Exposure Index	121.43 %
Percent of Fish Exposed [Number Exposed]	98.6 % [119698]
Number of Days Fish Exposed	43

Middle 50% of Run Period (May 2 - May 23)

Number of Fish Observed	77203
Percent of Middle 50% of Run Analyzed [Number Observed]	100 % [77203]
Tailrace TDG Percent Exposure Index	121.44 %
Percent of Fish Exposed [Number Exposed]	100 % [77203]
Number of Days Fish Exposed	22

Run Dates

First Day of Run	Mar 15
5% of Run passed	Apr 23
10% of Run passed	Apr 26
50% of Run passed	May 8
90% of Run passed	Jun 8
95% of Run passed	Jun 11
Last Day of Run	Jun 15

Date(s) When Tailrace TDG Percent Crosses 120 %

Apr 10

May 26

May 27

Jun 12