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	Lower Monumental
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 24)
Temperature Exposure Index	12.91 °C
Percent of Fish Exposed	12.3 %
Number of Days Fish Exposed	32

Middle 80% of Run Period (May 2 - Jun 1)
Temperature Exposure Index	12.8 °C
Percent of Fish Exposed	4.1 %
Number of Days Fish Exposed	2

Middle 50% of Run Period (May 9 - May 25)
Temperature Exposure Index	12.5 °C
Percent of Fish Exposed	0 %
Number of Days Fish Exposed	0

Run Dates
First Day of Run	Mar 12
5% of Run passed	Apr 27
10% of Run passed	May 2
50% of Run passed	May 15
90% of Run passed	Jun 1
95% of Run passed	Jun 5
Last Day of Run	Jul 24

Date(s) When Temperature Crosses 15 °C
May 31

1. Total Run Analyzed [99.945] is less than total observed during the period [100]. Only fish observed on days with River Parameter data are analyzed.