Executive Update

Snowpack Water Content
Region	Water Content (in inches)	% Avg to Date	% April 1 Avg (2)
Northern Sierra	19.10	70	67
Central Sierra	17.40	61	57
Southern Sierra	12.80	53	49
Statewide	16.60	62	58

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

Forecast of Regional Water Supply Indices (3)
Index	Unimpaired Runoff (in 1000 AF)	Year Type
8 River Index for February	2,140	n/a
Sacramento Valley Water Year Type Index (40-30-30) @ 50%	6,900	Below Normal
Sacramento Valley Water Year Type Index (40-30-30) @ 90%	6,100	Dry
San Joaquin Valley Water Year Type Index (60-20-20) @ 50%	2,600	Below Normal
San Joaquin Valley Water Year Type Index (60-20-20) @ 75%	2,300	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 03/10/2007 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	1,929	1,886	102	2,448	79	---
Shasta Lake	Sacramento	3,879	3,488	111	4,552	85	-277
Lake Oroville	Feather	2,983	2,595	115	3,538	84	-180
New Bullards Bar Res	Yuba	751	644	116	966	78	-45
Folsom Lake	American	620	574	108	977	63	-34
New Melones Res	Stanislaus	1,997	1,457	137	2,420	83	27
Don Pedro Res	Tuolumne	1,657	1,450	114	2,030	82	-33
Lake McClure	Merced	657	544	121	1,025	64	-18
Millerton Lake	San Joaquin	226	350	65	520	43	-21
Pine Flat Res	Kings	517	542	95	1,000	52	-335
Isabella	Kern	222	184	121	568	39	-81
San Luis Res	(Offstream)	1,871	1,802	104	2,039	92	---

(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 03/10/2007
	Jul 1 to Date 2006 - 2007 (in inches)	% Avg	Jul 1 to Date 2005 - 2006 (in inches)	% Avg	% Avg Jul 1 to Jun 30 2006 - 2007
Eureka	29.66	101	47.42	162	77
Redding	18.52	73	34.65	136	55
Sacramento	9.60	60	17.79	111	48
San Jose	7.79	66	13.65	115	51
Fresno	4.52	53	7.30	86	40
Bakersfield	2.11	44	3.39	71	32
Los Angeles	2.42	20	7.78	65	15
San Diego	3.30	40	2.59	31	30

Comments

Dry and unseasonably warm weather is expected to continue this week and into the weekend. National Weather Service Red Flag/Fire Weather warnings have been issued for Southern California. Above normal temperatures are causing many river flows to increase because of early snowmelt, but no sharp rises are expected. All river stages are forecast to remain below Monitor Levels at this time. As of March 1, Water Year 2007 statewide hydrologic conditions were as follows: precipitation, 70% of average to date; runoff, 55% of average to date; and reservoir storage, 105% for the date. February was the wettest month of Water Year 2007 (October 1, 2006 through February 28, 2007), with a series of storms that brought widespread precipitation to the northern and central portions of the State, along with significant snowfall to the Sierra. The snowpack increase during February was about 1.5 times of normal and the Northern Sierra 8-Station Index had about 13.5" of precipitation or about 169% of the monthly average, but this was not enough to eliminate the deficit of January. The projected median April-July snowmelt runoff for the State's water supply basins now ranges from 85% (Shasta Lake inflow) to 46% (Kern River). Sacramento River unimpaired runoff observed through February 28 was 4.9 million acre-feet (MAF), which is about 59% of average. (On February 28, 2006, the observed Sacramento River unimpaired runoff was 13.6 MAF or about 162% of average.) The median Sacrament River unimpaired runoff forecast rose from about 10.6 MAF (57% of average) on February 1 to about 12.1 MAF (65% of average) on March 1. Approximately 25% of the wet season remains and several large storms could quickly bring rainfall up to normal. However, the chances of recovery to a near average water year are decreasing as the wet season passes. Fortunately, the last few water years had above average precipitation and runoff, so ground water levels are near normal values. Many of the large water supply reservoirs in the foothills of the Central Valley are near flood control levels and cannot store additional water. The latest National Weather Service Climate Prediction Center (CPC) 90-Day long-range seasonal weather outlook (for March through May), issued February 15, suggests below average-to-average precipitation for all of California. The CPC expects a better than average chance for average to above average temperatures for most of the State. The latest CPC long-range weather for March, issued February 28, suggests below average rainfall for Southern California and above average rainfall for Northern California. Average to above average temperatures are forecast for the entire State. Updates to the Executive Summary will be generally issued weekly through the wet months of winter and spring. Beginning about June 1, this product is updated monthly through the dry season during the summer and fall. The next update of this product will be issued about Tuesday, March 20, 2007, unless there are significant hydrologic changes.