Columbia Basin Performance Measures

Sample Exposure Summary Tables for Multiple Critical Values: Chinook Adult Passage

• Year 2024
• Project Lower Granite
• River Parameter Temperature Tailrace
• Exposure Calculated Above Critical Value

Critical Temperature Tailrace Value 20 °C Summary

Total Run Period (Apr 9 - Dec 13)

Total Number of Fish Observed	91885
Percent of Total Run Analyzed [Number Observed]	100 % [91885]
Temperature Tailrace Exposure Index	15.77 °C
Percent of Fish Exposed [Number Exposed]	1 % [951]
Number of Days Fish Exposed	10

Middle 80% of Run Period (May 15 - Sep 19)

Number of Fish Observed	74974
Percent of Middle 80% of Run Analyzed [Number Observed]	100 % [74974]
Temperature Tailrace Exposure Index	15.86 °C
Percent of Fish Exposed [Number Exposed]	1.2 % [951]
Number of Days Fish Exposed	10

Run Dates

First Day of Run	Apr 9
5% of Run passed	May 13
10% of Run passed	May 15
50% of Run passed	Jun 20
90% of Run passed	Sep 19
95% of Run passed	Sep 26
Last Day of Run	Dec 13

Date(s) When Temperature Tailrace Crosses 20 °C

Jul 16

Jul 19

Aug 5

Aug 12

Critical Temperature Tailrace Value 21 °C Summary

Total Run Period (Apr 9 - Dec 13)

Total Number of Fish Observed	91885
Percent of Total Run Analyzed [Number Observed]	100 % [91885]
Temperature Tailrace Exposure Index	15.77 °C
Percent of Fish Exposed [Number Exposed]	0 % [0]
Number of Days Fish Exposed	0

Middle 80% of Run Period (May 15 - Sep 19)

Number of Fish Observed	74974
Percent of Middle 80% of Run Analyzed [Number Observed]	100 % [74974]
Temperature Tailrace Exposure Index	15.86 °C
Percent of Fish Exposed [Number Exposed]	0 % [0]
Number of Days Fish Exposed	0

Run Dates

First Day of Run	Apr 9
5% of Run passed	May 13
10% of Run passed	May 15
50% of Run passed	Jun 20
90% of Run passed	Sep 19
95% of Run passed	Sep 26
Last Day of Run	Dec 13

Critical Temperature Tailrace Value 22 °C Summary

Total Run Period (Apr 9 - Dec 13)

Total Number of Fish Observed	91885
Percent of Total Run Analyzed [Number Observed]	100 % [91885]
Temperature Tailrace Exposure Index	15.77 °C
Percent of Fish Exposed [Number Exposed]	0 % [0]
Number of Days Fish Exposed	0

Middle 80% of Run Period (May 15 - Sep 19)

Number of Fish Observed	74974
Percent of Middle 80% of Run Analyzed [Number Observed]	100 % [74974]
Temperature Tailrace Exposure Index	15.86 °C
Percent of Fish Exposed [Number Exposed]	0 % [0]
Number of Days Fish Exposed	0

Run Dates

First Day of Run	Apr 9
5% of Run passed	May 13
10% of Run passed	May 15
50% of Run passed	Jun 20
90% of Run passed	Sep 19
95% of Run passed	Sep 26
Last Day of Run	Dec 13