Executive Update

Hydrologic Conditions in California (06/02/2009)

Snowpack Water Content
Region	Water Content (in inches)	% Avg to Date	% April 1 Avg (2)
Northern Sierra	0.70	14	3
Central Sierra	1.40	15	5
Southern Sierra	0.60	5	2
Statewide	1.00	10	3

(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 May (in 1000 AF)	4,143	n/a
Sacramento Valley Water Year Type Index (40-30-30) @ 50%	5.5	Dry
Sacramento Valley Water Year Type Index (40-30-30) @ 90%	5.1	Critical
San Joaquin Valley Water Year Type Index (60-20-20) @ 50%	2.5	Dry
San Joaquin Valley Water Year Type Index (60-20-20) @ 75%	2.4	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 06/01/2009 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	1,291	2,155	60	2,448	53	---
Shasta Lake	Sacramento	3,110	3,955	79	4,552	68	-1,442
Lake Oroville	Feather	2,281	3,042	75	3,538	64	-1,257
New Bullards Bar Res	Yuba	928	833	111	966	96	-38
Folsom Lake	American	931	836	111	977	95	-46
New Melones Res	Stanislaus	1,333	1,501	89	2,420	55	-1,087
Don Pedro Res	Tuolumne	1,724	1,534	112	2,030	85	-105
Lake McClure	Merced	677	716	95	1,025	66	-101
Millerton Lake	San Joaquin	520	408	127	520	100	328
Pine Flat Res	Kings	742	724	103	1,000	74	-64
Isabella	Kern	250	295	85	568	44	-191
San Luis Res	(Offstream)	698	1,660	42	2,039	34	---

(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 06/01/2009
	Jul 1 to Date 2008 - 2009 (in inches)	% Avg	Jul 1 to Date 2007 - 2008 (in inches)	% Avg	% Avg Jul 1 to Jun 30 2008 - 2009
Eureka	29.57	79	33.95	91	78
Redding	21.43	65	24.00	73	64
Sacramento	15.77	89	13.71	77	88
San Francisco	15.19	76	15.55	78	76
Fresno	7.57	69	8.40	76	67
Bakersfield	4.89	77	2.38	37	75
Los Angeles	7.98	61	10.29	79	61
San Diego	9.12	85	7.23	68	85

Comments

As of June 1, 2009, statewide hydrologic conditions were as follows: precipitation, 80 percent of average to date; runoff, 65 percent of average to date; and reservoir storage, 85 percent of average for the date. Sacramento River unimpaired runoff observed through May 31, 2009 was about 11.1 million acre-feet (MAF), which is about 70 percent of average. (On May 31, 2008, the observed Sacramento River unimpaired runoff through that date was about 8.8 MAF or about 55 percent of average.) The latest National Weather Service Climate Prediction Center (CPC) long-range weather outlook for June 2009, issued May 31, 2009, forecasts above average precipitation for Central and Northern California. Average precipitation is forecast for Southern California. 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, July 9, 2009, unless there are significant hydrologic changes.