2000 California Hydrologic Data Report
b Change in contents, in acre-feet.
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 mi", excludes 18.1 mi" 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,
323,700 acre-ft, elevation, 1,515 ft. Lake receives West Branch 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, 322,203 acre-ft, May 6, elevation, 1,514.33 ft; minimum, 269,706
acre-ft, Oct. 24, elevation, 1,489.54 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 1999 TO SEPTEMBER 2000
DAILY OBSERVATION AT 2400 HOURS
DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP
1 287004 273272 285486 278152 288484 290326 297463 311827 312111 305891 300907 299723
2 285569 274082 286920 277233 289070 291880 295616 313381 312965 304078 298958 297804
3 284263 273829 289007 279852 289237 293017 297846 315425 311062 305739 301356 295892
4 282960 274913 287775 281681 289781 292132 300150 318139 309231 303862 303225 293987
5 281599 275482 286525 282836 288819 291480 300535 319735 307406 305286 301356 295701
6 282960 275909 285278 281784 287879 290661 298293 322203 308448 306710 299564 297612
7 281517 273798 283683 284097 286879 292806 300086 320934 310538 304974 297712 301349
8 282962 275035 285159 283146 287004 292174 300214 319535 312768 307038 295987 303238
9 280961 275706 283311 282093 285880 294431 298997 318139 313557 305156 299095 301242
10 279360 277989 283311 282857 284946 295701 296698 316725 311717 306778 302625 299381
11 277641 280037 281743 283683 287942 294812 298528 318361 309819 305027 300735 297591
12 278377 278438 280201 284387 287149 293861 300065 318737 307797 307038 298877 295553
13 279790 279647 278500 283146 286255 292911 301164 317343 305653 305286 297028 295129
14 277887 279831 278275 285652 285382 294156 304229 316064 306626 307298 295848 292764
15 277948 281126 276764 284408 286858 295998 305545 314809 307992 305480 296645 290473
16 275828 281929 274852 283290 287291 294812 303346 313469 309035 303862 294654 292616
17 273636 282692 275218 282176 289049 296507 301542 311956 307211 304768 298208 290389
18 272807 285756 273434 283994 290829 295172 304013 312549 305523 303002 299872 291733
19 272483 288568 271696 284684 289991 293818 306345 310975 307016 305005 297676 289404
20 273049 287254 272665 285507 289195 292216 309013 312549 305221 307081 295638 291102
21 272807 285943 270810 287024 288777 290724 311324 311040 307038 308513 295892 292764
22 274345 284491 272201 285901 290473 292027 313031 312352 308774 306691 293734 293966
23 272039 286359 272685 286733 289928 290326 311127 313338 310146 304940 294960 291817
24 269706 286858 273535 285548 291249 291964 310800 311564 308253 303195 296741 289676
25 272181 285652 273171 286858 292048 293354 313601 312746 306410 305480 298144 287254
26 273454 284283 271495 287837 291670 291775 312352 314193 307862 303583 295786 288129
27 273332 285403 272483 288756 290787 290263 314831 312417 310255 304466 293417 285694
28 275055 284159 274021 289237 289844 292701 315403 310582 308361 306735 294114 286879
29 276540 285133 274649 288276 291228 294664 315447 308687 309666 304789 294558 287420
30 274163 285258 275462 287399 --- 297144 313403 306800 307710 302851 296019 284926
31 271737 --- 276235 287775 --- 298997 --- 310734 --- 300985 295329 ---
MAX 287004 288568 289007 289237 292048 298997 315447 322203 313557 308513 303225 303238
MIN 269706 273272 270810 277233 284946 290263 295616 306800 305221 300985 293417 284926
a 1490.55 1497.16 1492.77 1498.37 1500.02 1503.69 1510.35 1509.13 1507.74 1504.62 1501.96 1497.00
b -16643 +13521 -9023 +11540 +3453 +7769 +14406 -2669 -3024 -6725 -5656 -10403
CAL YR 1999 b +5525
WTR YR 2000 b -3454
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