Columbia Basin Performance Measures

Adult Passage Exposure Results

Adult Steelhead Query Parameters

Year	2024
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	1/1 - 12/31

Total Run Period (Apr 1 - Oct 31)

Total Number of Fish Observed	96807
Percent of Total Run Analyzed [Number Observed]	100 % [96807]
Temperature Tailrace Exposure Index	18.74 °C
Percent of Fish Exposed [Number Exposed]	98.8 % [95692]
Number of Days Fish Exposed	139

Middle 80% of Run Period (Sep 1 - Oct 14)

Number of Fish Observed	77851
Percent of Middle 80% of Run Analyzed [Number Observed]	100 % [77851]
Temperature Tailrace Exposure Index	18.88 °C
Percent of Fish Exposed [Number Exposed]	100 % [77851]
Number of Days Fish Exposed	44

Middle 50% of Run Period (Sep 12 - Oct 3)

Number of Fish Observed	50736
Percent of Middle 50% of Run Analyzed [Number Observed]	100 % [50736]
Temperature Tailrace Exposure Index	18.92 °C
Percent of Fish Exposed [Number Exposed]	100 % [50736]
Number of Days Fish Exposed	22

Run Dates

First Day of Run	Apr 1
5% of Run passed	Aug 4
10% of Run passed	Sep 1
50% of Run passed	Sep 24
90% of Run passed	Oct 14
95% of Run passed	Oct 21
Last Day of Run	Oct 31

Date(s) When Temperature Tailrace Crosses 15 °C

Jun 13

Oct 30