11414090 FORDYCE LAKE NEAR CISCO, CA
LOCATION.-Lat 39°22'44", long 120°29'40", in NE 1/4 SE 1/4 sec.34, T.18 N., R.12 E., Nevada County, Hydrologic Unit 18020125, near left abutment of
Fordyce Dam on Fordyce Creek and 5.3 mi northeast of Cisco.
DRAINAGE AREA.-31.7 mi2.
PERIOD OF RECORD.-October 1977 to current year. Periodic gage heights only for October 1965 to September 1976 and daily contents for water year 1977 are in the
files of the U.S. Geological Survey.
GAGE.-Water-stage recorder. Datum of gage is 6,290.5 ft above sea level (levels by Pacific Gas & Electric Co.). Prior to Nov. 29, 1976, nonrecording gage on
upstream side of dam at same datum.
REMARKS.-Lake is formed by a rockfill dam; storage began in 1926. In 1980 the capacity of Fordyce Lake was increased by the addition of 3 ft of flashboards.
Capacity, 49,903 acre-ft between gage heights 0.85 ft, bottom of outlet valve, and 114.6 ft, top of flashboards in spillway. Released water flows down Fordyce
Creek (station 11414100) to Lake Spaulding (station 11414140) for use in a power and irrigation system. See schematic diagram of Yuba River Basin.
COOPERATION.-Records were collected by Pacific Gas & Electric Co., 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 FOR PERIOD OF RECORD.-Maximum contents, 49,903 acre-ft, June 27, July 4, 6, 1982, June 9, 15-17, 1984, several days in June 1989, and several days in
July 1998, gage height, 114.60 ft; minimum, 250 acre-ft, Oct. 31 to Nov. 7, 1979.
EXTREMES FOR CURRENT YEAR.-Maximum contents, about 49,900 acre-ft, July 15-19, gage height, about 114.60 ft; minimum, 7,060 acre-ft, Dec. 5, gage height, 36.43
ft.
Capacity table (gage height, in feet, and contents, in acre-feet)
(Based on table provided by Pacific Gas & Electric Co., dated May 1981)
4 219 20 2,608 40 8,183 80 26,770
5 278 25 3,827 50 11,797 90 32,820
10 774 30 5,170 60 16,174 100 39,342
15 1,570 35 6,628 70 21,196 114.6 49,903
RESERVOIR STORAGE (ACRE-FEET), WATER YEAR OCTOBER 1997 TO SEPTEMBER 1998
DAILY OBSERVATION AT 2400 HOURS
DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP
1 17692 12144 7152 e13455 9939 e11337 e12022 18763 31174 45720 46147 e32732
2 17554 11946 7124 e13649 9983 e11369 e12083 20085 32282 45999 45398 e32663
3 17388 11730 7100 e13727 10030 11380 e12140 21037 33090 46272 44654 e32613
4 17222 11498 7072 e13723 10045 11392 e12201 21675 e33671 46457 43897 e32557
5 17057 11263 7060 e13710 10063 11326 e12262 22143 e34358 46925 43147 e32550
6 16892 11031 7066 e13928 10082 11167 e12323 22544 e35045 47366 42341 e32507
7 16718 10798 7133 e14520 10108 11008 e12384 22998 e35738 47794 41584 e32457
8 16560 10557 7152 e14466 10159 10851 e12446 23732 e36436 48253 41048 e32375
9 16479 10311 e7340 e12128 10229 e10684 e12507 24533 e37147 48716 40703 e32326
10 16350 10078 e7561 e10527 10381 e10741 e12569 24968 e37857 49142 40010 e32132
11 16193 9838 e7798 e9597 10486 e10798 e12631 25201 e38573 49195 39098 e31878
12 16018 9600 e8035 e9007 10549 e10855 e12693 25350 e39301 49272 38331 e31648
13 15853 9368 e8260 e8649 10609 e10912 e12751 25458 e40030 49585 37777 e31352
14 15685 9146 e8543 e8556 10662 e10970 e12813 25498 e40765 49885 37219 e31044
15 15517 8921 e8789 e8563 10722 e11027 e12876 25516 e41507 49900 36646 e30384
16 15345 8699 e9056 e8689 10885 e11081 e12851 25613 e41570 49900 36096 e30068
17 15179 8486 e9354 e9014 10954 e11139 12742 25619 41159 49900 35530 e29348
18 15000 8256 e9629 e9326 e11027 e11198 12680 25659 41201 49900 34974 e28397
19 14823 8100 e9924 e9435 e11054 e11256 12701 25906 41291 49900 34422 e28130
20 14642 7893 e10207 e9516 e11081 e11314 12846 26281 41242 49846 33868 e27620
21 14453 7684 e10482 9607 e11112 e11373 13228 26589 41361 49762 33317 e27027
22 14261 7483 e10771 9685 e11139 e11431 13797 26787 41270 49654 32770 26357
23 14065 7309 e11047 9760 e11167 e11490 14435 27120 41110 49494 32220 26229
24 13840 7167 e11221 9809 e11194 e11549 14746 27591 41034 49325 31983 26102
25 13649 7115 e11404 9852 e11225 e11604 14936 28695 41549 49119 31933 25963
26 13442 7219 e11722 9895 e11252 e11663 15151 29132 42814 48891 e32020 25860
27 13173 7216 e12055 9928 e11279 e11722 15545 29324 43682 48678 e32188 25762
28 12965 7204 e12511 9953 e11310 e11781 16141 29451 44307 48389 e32369 25630
29 12755 7186 e12825 10023 --- e11841 16892 29572 44960 48087 e32544 25493
30 12557 7170 e12910 10052 --- e11901 17805 29687 45456 47606 e32726 25361
31 12352 --- e13100 10074 --- e11962 --- 30165 --- 46888 e32807 ---
MAX 17692 12144 13100 14520 11310 11962 17805 30165 45456 49900 46147 32732
MIN 12352 7115 7060 8556 9939 10684 12022 18763 31174 45720 31933 25361
a 51.37 36.79 45.49 63.37 85.70 108.68 110.62 77.56
b -5512 -5182 +5930 -3026 +1236 +652 +5843 +12360 +15291 +1432 -14081 -7446
CAL YR 1997 MIN 7060 b -11095
WTR YR 1998 MAX 49900 MIN 7060 b +7497
e Estimated.
a Gage height, in feet, at end of month.
b Change in contents, in acre-feet.
USGS Water Resources of California