Executive Update

Hydrologic Conditions in California (01/26/2010)

Snowpack Water Content
Region	Water Content (in inches)	% Avg to Date	% April 1 Avg (2)
Northern Sierra	20.50	123	71
Central Sierra	17.40	102	58
Southern Sierra	17.30	126	66
Statewide	18.30	115	64

(2)	April 1 is the date of normal maximum accumulation for the season.

Forecast of Regional Water Supply Indices (3)
Index	Value	Year Type
8 River Index for December (in 1000 AF)	690	n/a
Sacramento Valley Water Year Type Index (40-30-30) @ 50%	6.1	Dry
Sacramento Valley Water Year Type Index (40-30-30) @ 90%	4.4	Critical
San Joaquin Valley Water Year Type Index (60-20-20) @ 50%	2.9	Above Normal
San Joaquin Valley Water Year Type Index (60-20-20) @ 75%	2.3	Dry

(3)	For more information see Sacramento & San Joaquin Valley Water Year Type Index forecast: Latest | Previous     (Issued monthly from December 1 through May 1)

Key Reservoir Storage As of 01/25/2010 midnight
Reservoir	River	Storage (in 1000 AF)	Avg Storage (in 1000 AF)	% Average	Capacity (in 1000 AF)	% Capacity	Flood Control (4) Encroachment (in 1000 AF)
Trinity Lake	Trinity	1,022	1,743	59	2,448	42	---
Shasta Lake	Sacramento	2,453	3,084	80	4,552	54	-1,081
Lake Oroville	Feather	1,144	2,350	49	3,538	32	-1,702
New Bullards Bar Res	Yuba	572	572	100	966	59	-224
Folsom Lake	American	298	508	59	977	30	-279
New Melones Res	Stanislaus	1,210	1,382	88	2,420	50	-760
Don Pedro Res	Tuolumne	1,476	1,373	108	2,030	73	-214
Lake McClure	Merced	442	491	90	1,025	43	-233
Millerton Lake	San Joaquin	235	330	71	520	45	-178
Pine Flat Res	Kings	402	466	86	1,000	40	-272
Isabella	Kern	121	166	73	568	21	-49
San Luis Res	(Offstream)	1,081	1,583	68	2,039	53	---

(4)	Temporary encroachment into seasonally reserved flood storage space; requirements can vary considerably on a daily basis due to numerous variables: rainfall amounts, anticipated snowmelt, time of year, soil moisture, etc.

Selected Cities Precipitation Accumulation As of 01/25/2010
	Jul 1 to Date 2009 - 2010 (in inches)	% Avg	Jul 1 to Date 2008 - 2009 (in inches)	% Avg	% Avg Jul 1 to Jun 30 2009 - 2010
Eureka	20.13	96	13.69	66	53
Redding	15.88	93	8.39	49	47
Sacramento	12.04	131	6.14	67	67
San Francisco	12.30	118	5.31	51	61
Fresno	6.05	118	3.72	73	54
Bakersfield	3.67	128	2.06	72	57
Los Angeles	7.60	124	4.52	74	58
San Diego	5.70	113	6.13	122	53

Comments

As of December 31, 2009, statewide hydrologic conditions were as follows: precipitation, 85 percent of average to date; runoff, 40 percent of average to date; and reservoir storage, 75 percent of average for the date. Sacramento River unimpaired runoff observed through December 31, 2009 was about 1.5 million acre-feet (MAF), which is about 47 percent of average. For comparison, on December 31, 2008, the observed Sacramento River unimpaired runoff through that date was about 1.4 MAF, or about 44 percent of average. The latter half of January has been extremely wet for California. A series of extremely strong storms brought significant amounts of rain Statewide, along with large snowfall accumulations in the Sierra. Updated statewide hydrologic numbers and water supply forecasts will be available in early February. The latest National Weather Service Climate Prediction Center (CPC) long-range weather outlook for February 2010, issued January 21, 2009, forecasts above average precipitation for almost all of California. Average precipitation is expected for the far northern portion of the State. Updates to the Executive Summary will generally be issued approximately weekly or biweekly (depending on conditions) through the wet months of winter and spring. Beginning about June 1, this product is updated monthly through the dry seasons of summer and fall. The next update of this product will be issued about Thursday, February 11, 2010, unless there are significant hydrologic changes.