COLUMBIA RIVER  WATER TEMPERATURES (°F) AND TEMPERATURE UNITS (°C) BELOW BONNEVILLE DAM, 2000-2001.
(Water temperatures are from USFWS Ives Island temperature gauge 1, readings after January 31st are from 2000 data.)
OCTOBER NOVEMBER DECEMBER JANUARY FEBURARY MARCH APRIL MAY JUNE
TEMP TU's TEMP TU's TEMP TU's TEMP TU's TEMP TU's TEMP TU's TEMP TU's TEMP TU's TEMP TU's
DAY (°F) (°C) (°F) (°C) (°F) (°C) (°F) (°C) (°F) (°C) (°F) (°C) (°F) (°C) (°F) (°C) (°F) (°C)
1 63 17 55 13 43 6 39 4 37 3 39 4 45 7 50 10 57 14
2 63 17 55 13 43 6 37 3 37 3 39 4 45 7 50 10 57 14
3 63 17 55 13 43 6 39 4 37 3 39 4 46 8 50 10 58 14
4 63 17 54 12 43 6 39 4 37 3 39 4 46 8 52 11 58 15
5 61 16 54 12 43 6 37 3 37 3 39 4 46 8 52 11 58 15
6 61 16 54 12 43 6 39 4 37 3 39 4 46 8 52 11 58 15
7 61 16 54 12 43 6 37 3 37 3 39 4 46 8 52 11 58 15
8 59 15 52 11 43 6 37 3 37 3 39 4 46 8 52 11 58 15
9 59 15 52 11 43 6 37 3 37 3 41 5 46 8 52 11 59 15
10 59 15 50 10 43 6 37 3 37 3 41 5 48 9 52 11 58 14
11 59 15 50 10 41 5 37 3 37 3 41 5 48 9 52 11 58 14
12 59 15 50 10 41 5 37 3 37 3 41 5 48 9 52 11 58 14
13 59 15 50 10 41 5 37 3 37 3 41 5 48 9 52 11 58 14
14 59 15 50 10 41 5 37 3 37 3 41 5 48 9 54 12 58 14
15 59 15 48 9 41 5 37 3 37 3 41 5 48 9 54 12 59 15
16 59 15 48 9 41 5 37 3 39 4 41 5 48 9 54 12 59 15
17 59 15 46 8 41 5 37 3 39 4 43 6 50 10 54 12 60 16
18 59 15 46 8 41 5 37 3 39 4 43 6 50 10 54 12 61 16
19 59 15 45 7 41 5 37 3 39 4 43 6 50 10 54 12 60 16
20 59 15 45 7 41 5 37 3 39 4 43 6 50 10 54 12 60 16
21 57 14 45 7 39 4 37 3 39 4 43 6 50 10 55 13
22 55 13 45 7 39 4 37 3 39 4 43 6 50 10 55 13
23 55 13 45 7 39 4 37 3 39 4 43 6 50 10 56 13
24 55 13 45 7 39 4 37 3 39 4 43 6 50 10 57 14
25 55 13 45 7 39 4 37 3 39 4 43 6 50 10 57 14
26 55 13 45 7 39 4 37 3 39 4 45 7 50 10 57 14
27 55 13 45 7 39 4 37 3 39 4 45 7 50 10 57 14
28 55 13 45 7 39 4 37 3 39 4 45 7 50 10 57 14
29 55 13 45 7 39 4 37 3 39 4 45 7 50 10 57 14
30 55 13 45 7 39 4 37 3 45 7 50 10 57 14
31 55 13 39 4 37 3 45 7 57 14
TOTAL -- 455 -- 277 -- 154 -- 97 -- 101 -- 168 -- 273 -- 374.2 -- 0
AVE. 58.4 14.7 48.6 9.2 40.9 5.0 37.6 3.1 38.2 3.5 41.8 5.4 48.4 9.1 53.7 12.1 39.0 15.3
REQUIRED TEMPERATURE UNITS (TU'S) CUMULATIVE TU'S (°C) SINCE INITIATION AND END OF SPAWNING
FALL CHINOOK           (°C)  FALL CHINOOK FALL CHINOOK                                    
EYE OUT 250 EVENT DATE EYED OUT HATCHING EMERGENCE +2°C +3°C
HATCHING 500 BEGIN SPAWNING 10/16 258 11/3 502 12/1 1000 3/27 2/7 1/20
EMERGENCE 1000 PEAK SPAWNING 11/9 254 12/13 503 2/13 1004 5/2 4/2 3/17
END SPAWNING 12/4 253 1/27 506 3/27 1007 5/20 4/24 4/13
CHUM                   CHUM                                        
EYE OUT 400 EVENT DATE EYED OUT HATCHING EMERGENCE +2°C +3°C GW TU*
HATCHING 600 BEGIN SPAWNING 11/06 401 1/7 602 3/1 804 4/7 2/28 2/12 1/4
EMERGENCE 800 PEAK SPAWNING 12/01 400 3/4 604 4/7 805 5/1 4/4 3/22 2/8
END SPAWNING 12/18 402 3/29 607 4/23 3/12 5/10 4/17 4/6 3/5
*  Emergence based on egg pocket temperatures derived from adjusted peizometer readings through 2/22/01.