ESTIMATED COLUMBIA RIVER TEMPERATURE UNITS (°C) BELOW BONNEVILLE DAM, 2002-2003.
October through January temperature data is actual, February through June is data from year 2001.
		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		65		18.3		55		13		50		8.7		43		6		37		3		39		4		45		7		50		10		57		14
2		65		18.5		55		13		50		8.6		43		6		37		3		39		4		45		7		51		10		57		14
3		65		18.6		55		13		50		8.5		43		6		37		3		39		4		45		7		51		10		58		14
4		64		17.9		55		13		50		8.5		43		6		37		3		39		4		45		7		51		11		58		14
5		64		17.3		55		13		50		8.5		43		6		37		3		40		4		45		7		51		11		58		15
6		63		17.6		54		12		50		8.6		43		6		37		3		40		4		45		7		51		11		59		15
7		64		17.5		54		12		50		8.4		43		5		37		3		40		5		45		7		52		11		59		15
8		64		17.5		53		12		50		8.3		43		6		37		3		40		5		45		7		52		11		59		15
9		63		17.2		52		11		49		8.2		43		6		37		3		41		5		45		7		52		11		59		15
10		63		16.6		51		11		48		8.1		42		6		37		3		41		5		45		7		52		11		59		15
11		62		16.5		51		10		48		7.9		40		5		37		3		41		5		45		7		52		11		59		15
12		61		16.3		51		10		48		7.8		40		5		37		3		41		5		45		7		52		11		59		15
13		61		16.2		51		11		48		7.8		41		5		37		3		41		5		45		7		52		11		59		15
14		61		16.0		52		11		48		7.6		41		5		37		3		41		5		46		8		53		12		59		15
15		60		15.5		52		11		47		7.3		41		5		37		3		41		5		46		8		53		12		61		16
16		60		15.5		52		11		47		7.3		41		5		37		3		41		5		46		8		54		12		61		16
17		60		15.5		52		11		47		7.2		41		5		37		3		42		6		46		8		54		12		61		16
18		60		15.4		51		11		47		7.0		41		5		37		3		42		6		48		9		54		12		61		16
19		60		15.4		51		10		47		6.9		41		5		37		3		42		6		48		9		55		13		61		16
20		59		15.3		51		10		47		6.8		41		5		37		3		43		6		48		9		54		13		61		16
21		59		15.0		51		10		47		6.8		41		5		37		3		43		6		48		9		55		14		61		16
22		58		14.7		50		10		47		6.6		40		5		37		3		43		6		48		9		55		14		61		16
23		58		14.2		50		10		47		6.5		40		5		37		3		43		6		48		9		56		15		61		16
24		57		13.8		49		10		46		6.4		41		5		37		3		43		6		49		10		57		15		61		16
25		57		13.7		50		10		46		6.2		41		5		37		3		43		6		50		10		57		15		61		16
26		56		13.5		50		10		46		5.8		42		6		37		3		44		7		50		10		57		15		63		17
27		56		13.6		49		10		45		5.5		42		6		37		3		44		7		50		10		57		15		64		18
28		56		13.3		48		9		44		5.4		41		5		37		3		44		7		51		10		57		15		64		18
29		55		13.0		48		9		44		5.4		41		5		37		3		44		7		50		10		57		15		64		18
30		55		12.7		48		9		44		5.5		41		5						45		7		51		10		57		15		64		18
31		55		12.7						44		5.5		41		5						45		7						57		15
TOTAL		--		484.8		--		324.5		--		223.4		--		159.9		--		87		--		167		--		247		--		390		--		471
AVE.		60.2		15.6		51.5		10.8		47.5		7.2		41.5		5.2		37.4		3.0		41.7		5.4		46.8		8.2		53.8		12.6		60.3		15.7
	REQUIRED TEMPERATURE UNITS (TU'S)															CUMULATIVE TU'S (°C) SINCE INITIATION AND END OF SPAWNING
	FALL CHINOOK									(°C)					FALL CHINOOK	FALL CHINOOK
																								EMERGENCE
																EVENT				DATE						DATE
	EYE OUT									250					BEGIN SPAWNING					10/8						1/20
	HATCHING									500					PEAK SPAWNING					11/15						4/26
	EMERGENCE									1000					END SPAWNING					12/6						5/16
																CHUM
	CHUM																							EMERGENCE
																EVENT				DATE					DATE
																										+2°C		+3°C
	EYE OUT									400					BEGIN SPAWNING					11/5					1/29		1/18
	HATCHING									600					PEAK SPAWNING					11/26					3/13		2/25
	EMERGENCE									800					END SPAWNING					12/30					4/20		4/11
		Actual temperatures.
		Temperatures and TUs from year 2001data, gauge 1 data.