School of Aquatic and Fishery Sciences

Columbia Basin Performance Measures

Forecasted Juvenile Passage Exposure Results for Jul 20, 2025

graph

Forecasted Steelhead Snake R Wild Query Parameters
Year	2025
Project	Bonneville
River Parameter	Temperature
Critical Temperature Value	15 °C
Calculate Exposure	Above Critical Value
River Parameter Data Fill	No
Query Dates	1/1 - 12/31
Forecast Date	Jul 20, 2025

Total Run Period (Mar 12 - Jul 25)
Temperature Exposure Index	15.01 °C
Percent of Fish Exposed	44.1 %
Number of Days Fish Exposed	42

Middle 80% of Run Period (May 12 - Jun 8)
Temperature Exposure Index	14.97 °C
Percent of Fish Exposed	43.7 %
Number of Days Fish Exposed	13

Middle 50% of Run Period (May 18 - Jun 2)
Temperature Exposure Index	14.74 °C
Percent of Fish Exposed	38.6 %
Number of Days Fish Exposed	7

Run Dates
First Day of Run	Mar 12
5% of Run passed	May 7
10% of Run passed	May 12
50% of Run passed	May 25
90% of Run passed	Jun 8
95% of Run passed	Jun 11
Last Day of Run	Jul 25

Date(s) When Temperature Crosses 15 °C
May 27

1. Total Run Analyzed [99.954] is less than total observed during the period [100]. Only fish observed on days with River Parameter data are analyzed.