Columbia Basin Performance Measures

Adult Passage Exposure Results

Adult Steelhead Query Parameters

Year	2025
Project	John Day
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	99463
Percent of Total Run Analyzed [Number Observed]	100 % [99463]
Temperature Tailrace Exposure Index	20.65 °C
Percent of Fish Exposed [Number Exposed]	97.5 % [97046]
Number of Days Fish Exposed	152

Middle 80% of Run Period (Aug 3 - Oct 16)

Number of Fish Observed	79894
Percent of Middle 80% of Run Analyzed [Number Observed]	100 % [79894]
Temperature Tailrace Exposure Index	21.21 °C
Percent of Fish Exposed [Number Exposed]	100 % [79894]
Number of Days Fish Exposed	75

Middle 50% of Run Period (Sep 14 - Oct 6)

Number of Fish Observed	50744
Percent of Middle 50% of Run Analyzed [Number Observed]	100 % [50744]
Temperature Tailrace Exposure Index	21.41 °C
Percent of Fish Exposed [Number Exposed]	100 % [50744]
Number of Days Fish Exposed	23

Run Dates

First Day of Run	Apr 1
5% of Run passed	Jul 13
10% of Run passed	Aug 3
50% of Run passed	Sep 24
90% of Run passed	Oct 16
95% of Run passed	Oct 22
Last Day of Run	Oct 31

Date(s) When Temperature Tailrace Crosses 15 °C

May 27

Oct 27