School of Aquatic and Fishery Sciences

Columbia Basin Performance Measures

Adult Passage Exposure Results

graph

Adult Chinook Query Parameters
Year	2025
Project	Little Goose
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 10 - Jun 15)
Total Number of Fish Observed	45148
Percent of Total Run Analyzed [Number Observed]	98.75 % [44587]¹
Temperature Tailrace Exposure Index	13.57 °C
Percent of Fish Exposed [Number Exposed]	28.6 % [12787]
Number of Days Fish Exposed	16

Middle 80% of Run Period (May 10 - Jun 7)
Number of Fish Observed	36613
Percent of Middle 80% of Run Analyzed [Number Observed]	100 % [36613]
Temperature Tailrace Exposure Index	13.41 °C
Percent of Fish Exposed [Number Exposed]	24.5 % [8992]
Number of Days Fish Exposed	9

Middle 50% of Run Period (May 14 - Jun 1)
Number of Fish Observed	26126
Percent of Middle 50% of Run Analyzed [Number Observed]	100 % [26126]
Temperature Tailrace Exposure Index	13.08 °C
Percent of Fish Exposed [Number Exposed]	13.1 % [3435]
Number of Days Fish Exposed	3

Run Dates
First Day of Run	Apr 10
5% of Run passed	May 7
10% of Run passed	May 10
50% of Run passed	May 24
90% of Run passed	Jun 7
95% of Run passed	Jun 11
Last Day of Run	Jun 15

Date(s) When Temperature Tailrace Crosses 15 °C
May 30

1. Total Run Analyzed [44587] is less than total observed during the period [45148]. Only fish observed on days with River Parameter data are analyzed.