b Change in contents, in acre feet.
                                  10260790 SILVERWOOD LAKE NEAR HESPERIA, CA.  


LOCATION - Lat 34 ° 18'15", long 117 ° 19'05", in SW 1/4 NE 1/4 sec.32, T.3 N., R.4 W., San Bernardino 
County, Hydrologic Unit 18090208, San Bernardino National Forest, in control structure, near spillway 
of Cedar Springs Dam, and 8.7 mi south of Hesperia.

DRAINAGE AREA - 34.0 mi 2 .

PERIOD OF RECORD - October 1995 to current year. Unpublished records for water years 1972.95 available 
in files of the California Department of Water Resources.

GAGE - Water-stage recorder. Datum of gage is sea level.

REMARKS - Lake is formed by earthfill dam completed in 1972. Capacity, 74,970 acre-ft, at spillway crest 
of 3,355 ft. Dead storage at invert of outlet structure, 3,967 acre-ft, elevation, 3,235 ft. Lake 
is a holding basin for East Branch California Aqueduct. See REMARKS for station 10260820. See schematic 
diagram of Mojave River Basin.

COOPERATION - Records were collected by California Department of Water Resources, under general supervision 
of the U.S. Geological Survey, in connection with a Federal Energy Regulatory Commission project. 
Contents not rounded to U.S. Geological Survey standards. EXTREMES (AT 2400 HOURS)

FOR PERIOD OF RECORD - Maximum contents, 74,843 acre-ft, Oct. 24, 1999, elevation, 3,354.87 ft; minimum, 
38,006 acre-ft, Mar. 22, 1996, elevation, 3,310.24 ft. EXTREMES (AT 2400 HOURS)

FOR CURRENT YEAR - Maximum contents, 74,843 acre-ft, Oct. 24, elevation, 3,354.87 ft; minimum, 50,673 
acre-ft, Dec. 7, elevation, 3,327.40. Capacity table (elevation, in feet, and contents, in acre-feet) 
(Based on table provided by California Department of Water Resources, dated January 1978) 3,300 31,395 
3,335 56,811 3,315 41,311 3,345 65,554 3,325 48,732 3,355 74,970

RESERVOIR STORAGE (ACRE-FEET), WATER YEAR OCTOBER 1999 TO SEPTEMBER 2000
DAILY OBSERVATION AT 2400 HOURS
DAY      OCT      NOV      DEC      JAN      FEB      MAR      APR      MAY      JUN      JUL      AUG      SEP

1      71283    72169    51444    68753    70129    68921    70280    70856    71539    72389    70729    70374
2      71178    71606    51229    69819    70421    68400    70092    71121    71473    71958    69697    70412
3      70809    70809    51436    70045    69763    68474    69753    71530    71112    71387    69200    70998
4      71577    69922    51292    70233    69388    68391    69763    71587    71169    71930    69398    70998
5      71444    69052    51372    70365    69313    68865    69847    71406    70506    71577    68700    70412

6      71587    68307    51308    70101    69145    69351    70346    70875    70572    71245    68812    70403
7      71710    67660    50673    70129    68968    70742    70639    71102    70431    70686    66786    70120
8      71292    66770    52808    70129    68409    71691    71254    71245    70355    70847    68745    69866
9      71634    65745    54709    70412    69005    72092    71501    71131    70667    71008    68438    70271
10     71691    65129    56870    70705    69295    71235    71112    70572    70771    71691    68848    70648

11     71863    64641    59598    70922    70450    70818    71587    70780    70960    71074    69155    70318
12     72322    63619    62093    70903    70941    70771    71663    71701    70425    70941    69455    69735
13     72369    62402    64264    70828    71425    70459    70941    72197    71264    70355    70355    69351
14     72503    61372    65863    70176    70884    69491    69725    73003    71235    70035    70751    69575
15     72580    59970    67983    70554    70970    69341    69416    72513    70393    70111    69960    69136

16     72111    58619    69238    70365    70676    69154    72503    72666    69979    70393    68967    69089
17     72859    57258    69276    70742    70421    69145    72111    72178    70686    69725    67946    70516
18     73272    56056    69566    70932    70393    68874    72647    71958    71159    69585    67079    70742
19     73060    54767    69285    71017    70459    69070    72283    71853    70894    69538    67521    70620
20     72993    54471    69192    70979    71302    69810    72312    70620    70884    69697    67844    70506

21     72465    54028    69098    70676    71330    69716    71796    71387    70979    70158    68549    69444
22     72235    52930    69763    70111    71321    70186    72216    71730    71064    70374    67770    68688
23     73128    52116    69847    69998    71987    70280    72465    71625    70403    70875    66731    68326
24     74843    51691    69575    70111    71634    70875    71558    70960    70054    71169    66914    69557
25     74551    52075    69388    70035    70544    70913    71911    70695    70648    71634    66465    69688

26     74677    51955    69388    70412    70393    71017    71131    71036    70393    71169    67503    69838
27     74745    52188    69472    70214    70252    71207    71378    71520    69585    71102    68595    69988
28     74638    51715    69201    70223    69810    71444    71752    71968    70242    70601    68642    69819
29     74259    51229    69108    70506    69238    70989    70337    72197    70884    71264    68660    69510
30     74201    51316    69397    70318      ---    70894    70894    71853    71530    71055    70148    69951

31     73745      ---    69304    70223      ---    70554      ---    71882      ---    70752    69379      ---
MAX    74843    72169    69847    71017    71987    72092    72647    73003    71539    72389    70751    70998
MIN    70809    51229    50673    68753    68409    68391    69416    70572    69585    69538    66465    68326
a    3353.70  3328.20  3348.98  3349.96  3348.91  3350.31  3350.67  3351.72  3351.35  3350.52  3349.06  3349.67
b      +2234   -22429   +17988     +919     -985    +1316     +340     +988     -352     -778    -1373     +572
CAL YR 1999 b -4403
WTR YR 2000 b -1560