11108133 CASTAIC LAKE NEAR CASTAIC, CA
LOCATION.-Lat 34°31'22", long 118°36'43", in NW 1/4 NE 1/4 sec.13, T.5 N., R.16 W., Los Angeles County,
Hydrologic Unit 18070102, in intake tower in Castaic Lake and 2.3 mi north of Castaic.
DRAINAGE AREA.-137 mi2, excludes 18.1 mi2 noncontributing 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 California Aqueduct water diverted from Pyramid Lake (station 11109520) via
Castaic Powerplant to Elderberry Forebay (station 11108092). 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 were collected 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 HOURS) FOR PERIOD OF RECORD.-Maximum contents, 322,962 acre-ft, Mar. 25, 1998, elevation,
1,514.67 ft; minimum, 142,325 acre-ft, Jan. 7, 1995, elevation, 1,415.48 ft.
EXTREMES (AT 2400 HOURS) FOR CURRENT YEAR.-Maximum contents, 307,536 acre-ft, Oct. 8, elevation, 1,507.66 ft;
minimum, 228,494 acre-ft, Feb. 28, elevation, 1,468.12 ft.
Capacity table (elevation in feet, and contents, in acre-feet)
(Based on table provided by California Department of Water Resources in 1978)
1,450 196,414 1,490 270,629
1,460 213,807 1,500 291,186
1,470 231,964 1,510 310,451
1,480 250,894 1,520 334,985
RESERVOIR STORAGE (ACRE-FEET), WATER YEAR OCTOBER 1998 TO SEPTEMBER 1999
DAILY OBSERVATION AT 2400 HOURS
DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP
1 305178 294769 282939 270148 247274 229617 272847 297208 297144 287254 283290 284056
2 306150 294347 282733 269585 246641 230392 273535 296698 296465 286442 282361 285050
3 305523 294981 282320 268561 246010 229396 277152 296252 297868 285694 283435 285403
4 304509 294072 281846 268561 245608 235089 277948 298080 297485 285071 282382 284532
5 305869 293776 281414 258119 245035 234138 280550 297548 297038 284387 284201 283725
6 304919 293185 281167 267659 244654 233412 283063 299616 296443 283642 283270 284739
7 303475 292743 280735 267038 244025 237034 287712 299125 295998 285133 282341 285424
8 307536 292322 280735 266379 243150 238311 289614 298570 296762 284304 281393 284491
9 305027 291901 280735 265979 243150 237447 294051 298102 296125 285797 280468 286067
10 303733 291459 280529 265361 242561 238969 293207 297527 297485 285050 281949 287212
11 302873 290829 280529 264764 242087 241973 292511 298421 296783 284594 280961 286317
12 301799 291039 280324 263948 241708 241177 294283 297910 296210 283828 282444 285569
13 301799 290619 280119 262936 241121 240383 296359 298933 295574 283146 283745 284636
14 301370 290179 279708 261628 240591 240837 299573 298421 294918 283890 282815 285631
15 302185 289760 279073 260266 239817 240157 301756 297846 295680 283001 282011 284822
16 301285 289760 278438 258868 239440 242713 302486 297336 294918 284014 281085 286379
17 300407 289593 277887 257278 238781 247696 301606 296804 294325 283394 282692 287316
18 298954 289341 277254 255888 236959 250082 300492 298272 293671 282712 281702 286442
19 298443 288860 276846 254639 236491 252443 302293 297697 292975 284636 283766 285818
20 299530 288171 276418 253452 235929 252094 300963 299104 292301 283952 283890 284822
21 298443 287525 275746 252947 235238 251687 301563 298485 291670 285444 282960 286067
22 299018 287108 275340 252365 234492 251222 301778 298038 291039 284636 282093 285320
23 298272 286359 274771 251784 233654 253861 300557 297591 290410 285964 281229 287170
24 297421 285943 274142 251377 232650 256416 299317 297144 289593 284967 282960 286255
25 296677 285735 273737 250797 231594 259300 298080 297910 288840 284076 284760 285320
26 296677 285092 273332 250411 230540 262717 296911 297399 288025 284146 283766 284387
27 297102 284408 272908 249812 229488 262262 297229 298805 287149 285569 285818 283704
28 295574 284201 272504 249234 228494 261846 297719 298230 286400 284573 284428 284698
29 297527 283787 271838 248637 --- 264226 297017 297591 286983 286317 283435 285943
30 296040 283352 271233 248253 --- 267378 297591 297144 296171 285278 282506 288380
31 295828 --- 270710 247657 --- 268741 --- 296571 --- 284346 283249 ---
MAX 307536 294981 282939 270148 247274 268741 302486 299616 297868 287254 285818 288380
MIN 295574 283352 270710 247657 228494 229396 272847 296252 286400 282712 280468 283704
a 1502.20 1496.24 1490.04 1478.32 1468.12 1489.06 1503.03 1502.55 1497.60 1496.72 1496.19 1498.66
b -9955 -12476 -12642 -23053 -19163 +40247 +28850 -1020 -400 -11825 -1097 +5131
CAL YR 1998 b -16377
WTR YR 1999 b -17403
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