Table    Comparison of peak emergence dates to peak catch dates of juvenile fall chinook and chum below Bonneville Dam,  
1999-2003.
Chinook Chum
1999 2000 2001 2002 2003 1999 2000 2001 2002 2003
estimated peak 
emergence date: April 28 April 14 May 06 April 26 April 26 April 04 March 13 March 26 Feb. 25 March 12
temp. (oF): 50 48 52 48 44 41 44 39
peak catch date: June 15 May 12 May 01 June 07 ? April 01 March 21 April 17 April 09 ?
temp. (oF): 57 52 50 59 44 43 46 45
Bonneville Dam
tailwater elevation (ft)
at first catch date:b 23.1 21.6 15.1 26.4 22.4 16.6 11.5 13.4
Bonneville Dam
discharge (KCFS)
at first catch date:b 296 277 180 379 266 187 143 137
number caught 391 1,710 1,156 319 13 37 1,024 141
on peak date:
% of total caught
through peak date: 77 44 52 69 72 66 85 80
mean length (mm): 57 47 51 60 42 38 43 39
number of weeks
between peak dates: 6 4 0 6 0 1 3 6
                                       
Table    Comparison of peak emergence dates to peak catch dates of juvenile fall chinook and chum below Bonneville Dam,  
1999-2003.
Chinook Chum
1999 2000 2001 2002 2003 1999 2000 2001 2002 2003
estimated peak 
emergence date: April 28 April 14 May 06 April 26 April 26 April 04 March 13 March 26 Feb. 25 March 12
temp. (oF): 50 48 52 48 44 41 44 39
peak catch date: June 15 May 12 May 01 June 07 ? April 01 March 21 April 17 April 09 ?
temp. (oF): 57 52 50 59 44 43 46 45
Bonneville Dam
tailwater elevation (ft)
at first catch date:b 23.1 21.6 15.1 26.4 22.4 16.6 11.5 13.4
Bonneville Dam
discharge (KCFS)
at first catch date:b 296 277 180 379 266 187 143 137
number caught 391 1,710 1,156 319 13 37 1,024 141
on peak date:
% of total caught
through peak date: 77 44 52 69 72 66 85 80
mean length (mm): 57 47 51 60 42 38 43 39
number of weeks
between peak dates: 6 4 0 6 0 1 3 6
                                       
a The majority of chinook represented in the numbers are of a late spawning stock (URBs).
b USACE 12:00 am reading.