Columbia Basin Performance Measures

Adult Passage Exposure Results

Adult Chinook Query Parameters

Year	2025
Project	The Dalles
River Parameter	Temperature Tailrace
Critical Temperature Tailrace Value	15 °C
Calculate Exposure	Above Critical Value
River Parameter Data Fill	No
Query Dates	3/15 - 6/15

Total Run Period (Mar 21 - Jun 15)

Total Number of Fish Observed	100411
Percent of Total Run Analyzed [Number Observed]	100 % [100411]
Temperature Tailrace Exposure Index	14.05 °C
Percent of Fish Exposed [Number Exposed]	26.2 % [26393]
Number of Days Fish Exposed	20

Middle 80% of Run Period (Apr 30 - Jun 10)

Number of Fish Observed	82955
Percent of Middle 80% of Run Analyzed [Number Observed]	100 % [82955]
Temperature Tailrace Exposure Index	13.98 °C
Percent of Fish Exposed [Number Exposed]	21.9 % [18216]
Number of Days Fish Exposed	15

Middle 50% of Run Period (May 5 - May 28)

Number of Fish Observed	53573
Percent of Middle 50% of Run Analyzed [Number Observed]	100 % [53573]
Temperature Tailrace Exposure Index	13.5 °C
Percent of Fish Exposed [Number Exposed]	4.1 % [2239]
Number of Days Fish Exposed	2

Run Dates

First Day of Run	Mar 21
5% of Run passed	Apr 27
10% of Run passed	Apr 30
50% of Run passed	May 12
90% of Run passed	Jun 10
95% of Run passed	Jun 12
Last Day of Run	Jun 15

Date(s) When Temperature Tailrace Crosses 15 °C

May 27