USGS
1995 California Hydrologic Data Report
11108133 CASTAIC LAKE NEAR CASTAIC, CA
LOCATION.--Lat 34`31'18", long 118`36'18", in SW 1/4 NW 1/4 sec.18, T.5 N., R.16 W., Los Angeles County,
Hydrologic Unit 18070102, on center of upstream face of Castaic Dam and 3.0 mi north of Castaic.
DRAINAGE AREA.--137 mi2, excludes 18.1 mi2 non-contributing area in Elizabeth Canyon Creek basin.
PERIOD OF RECORD.--October 1988 to current year. Prior to October 1988 in files of California Department of
Water Resources.
GAGE.--Water-stage recorder. Datum of gage is sea level.
REMARKS.--Lake is formed by earthfill dam. Storage began April 1972. Dead storage below outlet tower to
downstream distribution system, 1,799 acre-ft, elevation, 1,213 ft. Capacity below spillway level,
323,699 acre-ft, elevation 1,515 ft. Lake receives natural inflow from Castaic Creek and its tributaries, and
water diverted from Pyramid Lake through Angeles Tunnel. Water is released downstream through Castaic Tunnel
No. 1 and to Castaic Lagoon. Records, including extremes, represent total contents at 2400 hours. See
schematic diagram of Santa Clara River basin.
COOPERATION.--Records provided by California Department of Water Resources, under the 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) FOR PERIOD OF RECORD.--Maximum contents, 321,914 acre-ft, Mar. 28, 29, 1993, elevation,
1,514.20 ft; minimum, 147,551 acre-ft, Nov. 8, 1988, elevation, 1,419.08 ft.
EXTREMES (AT 2400) FOR CURRENT YEAR.--Maximum contents, 316,240 acre-ft, June 16, elevation, 1,511.64 ft;
minimum, 142,325 acre-ft, Jan. 7, elevation, 1,415.48 ft.
Capacity table (elevation in feet, and contents, in acre-feet)
(Based on data provided by California Department of Water Resources in 1978)
1450 196,414 1490 270,629
1460 213,807 1500 291,186
1470 231,964 1510 310,451
1480 250,894 1520 334,985
RESERVOIR STORAGE (ACRE-FEET), WATER YEAR OCTOBER 1994 TO SEPTEMBER 1995
DAILY OBSERVATION AT 2400 HOURS
DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP
1 235313 198203 179117 146061 172058 195904 305199 311674 314171 314589 309775 299979
2 233710 198493 179214 145173 173153 199640 305999 311433 313754 313930 311674 299360
3 232149 198801 177102 144360 174394 201721 303604 313118 313447 313381 310844 298634
4 232650 197537 180219 144085 174507 204177 305869 312921 313074 312833 310102 297974
5 233338 196176 182363 143391 174571 206283 308535 312661 312833 312286 309449 297272
6 233263 194938 181581 142756 174651 207139 311608 312527 312286 311761 308709 296550
7 231908 193570 179879 142325 174746 207209 311127 312330 311761 315909 307970 298954
8 230392 192241 178019 142526 174906 208611 310734 312177 314369 315271 307276 298272
9 228807 193301 176187 142627 176026 211997 310407 311980 313908 314765 306583 297676
10 227026 194871 174587 147933 177794 213558 310211 313667 315403 314215 308296 297059
11 225070 193823 173201 151639 177858 217756 309928 313447 314941 313557 307515 296507
12 223251 192728 173646 152770 177907 228825 311914 313074 314413 316130 306735 295850
13 221326 191637 174013 152770 179570 229120 311652 312724 315469 315491 305999 295172
14 219592 190482 172534 152651 182558 233319 313798 312374 314831 314897 305286 296443
15 217882 189298 170998 152547 182917 240383 313557 312111 315821 314237 304552 297889
16 216354 188102 169375 152398 182819 240516 313513 311870 316240 313667 303841 297357
17 214733 187075 167792 152234 183211 242865 313403 313513 315711 313074 303152 296783
18 213131 185754 166169 152055 183407 246507 315073 313294 315381 312461 302507 296337
19 211254 184324 164569 151832 183538 246660 314677 312921 314853 311805 301928 295807
20 209561 182917 162916 151654 183620 251764 314062 312527 314303 314457 301392 295108
21 207910 181419 161255 151446 183735 256416 315095 312220 315821 313952 300856 296252
22 206266 179764 159589 151238 183866 262579 314413 311870 315271 313118 300321 298038
23 204768 180867 157976 151045 183964 264704 313667 311433 316108 312593 302636 297421
24 203311 180834 156568 151476 184095 271233 312943 313842 315447 311980 302014 296783
25 203311 178923 155242 154626 184144 275767 312220 313579 314853 313513 301285 296210
26 204004 177134 153787 158082 184226 280078 313754 313316 314677 312593 300599 295595
27 202532 175418 152308 160383 185738 281784 313294 313031 314215 311761 299915 296252
28 201101 173599 150971 162962 189781 285880 312855 312768 315134 313425 299360 298293
29 199846 171726 149669 166449 --- 291880 312461 312527 315645 312395 298549 297719
30 198647 180235 148388 168810 --- 296380 312045 312198 315029 311521 297804 297229
31 197435 --- 147127 170383 --- 300321 --- 312921 --- 310647 300706 ---
MAX 235313 198801 182363 170383 189781 300321 315095 313842 316240 316130 311674 299979
MIN 197435 171726 147127 142325 172058 195904 303604 311433 311761 310647 297804 295108
a 1450.60 1440.25 1418.79 1434.09 1446.06 1504.31 1509.73 1510.13 1511.09 1509.90 1504.50 1502.96
b -39187 -17200 -33108 +23256 +19398 +110540 +11724 +876 +2108 -4382 -9941 -3477
CAL YR 1994 MAX 298720 MIN 147127 b -78619
WTR YR 1995 MAX 316240 MIN 142325 b +60607
a Elevation, in feet, at end of month.
b Change in contents, in acre-feet.
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