Columbia Basin Performance Measures

Adult Passage Exposure Results

Adult Chinook Query Parameters

Year	2025
Project	Ice Harbor
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 7 - Jun 15)

Total Number of Fish Observed	52783
Percent of Total Run Analyzed [Number Observed]	100 % [52783]
Temperature Tailrace Exposure Index	13.75 °C
Percent of Fish Exposed [Number Exposed]	17.3 % [9183]
Number of Days Fish Exposed	16

Middle 80% of Run Period (May 5 - Jun 6)

Number of Fish Observed	43807
Percent of Middle 80% of Run Analyzed [Number Observed]	100 % [43807]
Temperature Tailrace Exposure Index	13.53 °C
Percent of Fish Exposed [Number Exposed]	10 % [4381]
Number of Days Fish Exposed	7

Middle 50% of Run Period (May 10 - May 27)

Number of Fish Observed	28863
Percent of Middle 50% of Run Analyzed [Number Observed]	100 % [28863]
Temperature Tailrace Exposure Index	13.19 °C
Percent of Fish Exposed [Number Exposed]	0 % [0]
Number of Days Fish Exposed	0

Run Dates

First Day of Run	Apr 7
5% of Run passed	May 3
10% of Run passed	May 5
50% of Run passed	May 16
90% of Run passed	Jun 6
95% of Run passed	Jun 10
Last Day of Run	Jun 15

Date(s) When Temperature Tailrace Crosses 15 °C

May 31