Columbia Basin Performance Measures

Adult Passage Exposure Results

Adult Steelhead 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	1/1 - 12/31

Total Run Period (Apr 1 - Oct 31)

Total Number of Fish Observed	70931
Percent of Total Run Analyzed [Number Observed]	100 % [70931]
Temperature Tailrace Exposure Index	18.92 °C
Percent of Fish Exposed [Number Exposed]	96.2 % [68278]
Number of Days Fish Exposed	141

Middle 80% of Run Period (Sep 11 - Oct 20)

Number of Fish Observed	56933
Percent of Middle 80% of Run Analyzed [Number Observed]	100 % [56933]
Temperature Tailrace Exposure Index	19.26 °C
Percent of Fish Exposed [Number Exposed]	100 % [56933]
Number of Days Fish Exposed	40

Middle 50% of Run Period (Sep 23 - Oct 13)

Number of Fish Observed	38289
Percent of Middle 50% of Run Analyzed [Number Observed]	100 % [38289]
Temperature Tailrace Exposure Index	19.47 °C
Percent of Fish Exposed [Number Exposed]	100 % [38289]
Number of Days Fish Exposed	21

Run Dates

First Day of Run	Apr 1
5% of Run passed	Aug 13
10% of Run passed	Sep 11
50% of Run passed	Oct 3
90% of Run passed	Oct 20
95% of Run passed	Oct 25
Last Day of Run	Oct 31

Date(s) When Temperature Tailrace Crosses 15 °C

May 30

Oct 28