Columbia Basin Performance Measures

Adult Passage Exposure Results

Adult Chinook Query Parameters

Year	2025
Project	Lower Monumental
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 8 - Jun 15)

Total Number of Fish Observed	47764
Percent of Total Run Analyzed [Number Observed]	100 % [47764]
Temperature Tailrace Exposure Index	13.65 °C
Percent of Fish Exposed [Number Exposed]	24.6 % [11755]
Number of Days Fish Exposed	16

Middle 80% of Run Period (May 8 - Jun 6)

Number of Fish Observed	38348
Percent of Middle 80% of Run Analyzed [Number Observed]	100 % [38348]
Temperature Tailrace Exposure Index	13.43 °C
Percent of Fish Exposed [Number Exposed]	18.4 % [7081]
Number of Days Fish Exposed	7

Middle 50% of Run Period (May 12 - May 30)

Number of Fish Observed	25135
Percent of Middle 50% of Run Analyzed [Number Observed]	100 % [25135]
Temperature Tailrace Exposure Index	12.88 °C
Percent of Fish Exposed [Number Exposed]	0 % [0]
Number of Days Fish Exposed	0

Run Dates

First Day of Run	Apr 8
5% of Run passed	May 5
10% of Run passed	May 8
50% of Run passed	May 21
90% of Run passed	Jun 6
95% of Run passed	Jun 11
Last Day of Run	Jun 15

Date(s) When Temperature Tailrace Crosses 15 °C

May 31