Columbia Basin Performance Measures

Adult Passage Exposure Results

Adult Chinook Query Parameters

Year	2025
Project	John Day
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 (Apr 1 - Jun 15)

Total Number of Fish Observed	88174
Percent of Total Run Analyzed [Number Observed]	100 % [88174]
Temperature Tailrace Exposure Index	14.07 °C
Percent of Fish Exposed [Number Exposed]	26.5 % [23376]
Number of Days Fish Exposed	20

Middle 80% of Run Period (May 1 - Jun 10)

Number of Fish Observed	71931
Percent of Middle 80% of Run Analyzed [Number Observed]	100 % [71931]
Temperature Tailrace Exposure Index	13.89 °C
Percent of Fish Exposed [Number Exposed]	20.9 % [15058]
Number of Days Fish Exposed	15

Middle 50% of Run Period (May 6 - May 28)

Number of Fish Observed	47771
Percent of Middle 50% of Run Analyzed [Number Observed]	100 % [47771]
Temperature Tailrace Exposure Index	13.47 °C
Percent of Fish Exposed [Number Exposed]	4.3 % [2078]
Number of Days Fish Exposed	2

Run Dates

First Day of Run	Apr 1
5% of Run passed	Apr 28
10% of Run passed	May 1
50% of Run passed	May 13
90% of Run passed	Jun 10
95% of Run passed	Jun 13
Last Day of Run	Jun 15

Date(s) When Temperature Tailrace Crosses 15 °C

May 27