11269500 LAKE MCCLURE AT EXCHEQUER, CA
LOCATION.-Lat 37°35'02", long 120°16'09", in NW 1/4 SE 1/4 sec.13, T.4 S., R.15 E., Mariposa County, Hydrologic Unit 18040008, on left end of New
Exchequer Dam on Merced River, 0.9 mi east of Exchequer, and 5.5 mi northeast of Merced Falls.
DRAINAGE AREA.-1,037 mi2.
PERIOD OF RECORD.-April 1926 to September 1930 (daily gage heights; also summary of yearly contents in WSP 881), October 1930 to current year.
REVISED RECORDS.-WSP 881: 1926-32 (yearly summaries only). WSP 1345: 1951(M). WSP 1930: Drainage area.
GAGE.-Water-stage recorder. Datum of gage is sea level (levels by Merced Irrigation District). Prior to Oct. 1, 1964, indicator in powerplant at same datum.
Oct. 1, 1964, to July 31, 1966, nonrecording gage at center of upstream face of dam at same datum.
REMARKS.-Reservoir is formed by a rockfill dam with a reinforced concrete face completed in March 1967. Dam is downstream from and connected to the original
concrete arch and gravity-type dam which was completed in April 1926. Usable capacity, 1,024,000 acre-ft between elevations 440.0 ft, invert entrance to outlet
tunnel, and 867.0 ft, top of spillway gates. Dead storage, 300 acre-ft. Water is released through a series of powerplants down the Merced River to a diversion
dam for Merced Irrigation District's main canal.
COOPERATION.-Records were provided by Pacific Gas and Electric Company under general supervision of the U.S. Geological Survey, in connection with a Federal
Energy Regulatory Commission project.
EXTREMES FOR PERIOD OF RECORD.-Maximum contents, 1,026,000 acre-ft, July 14, 15, 1969, elevation, 867.2 ft; practically no storage at times in 1926, 1930-31,
1964-65 when reservoir was drained for inspection or construction. Minimum since construction of New Exchequer Dam in 1966 and since lake first filled, 66,100
acre-ft, Feb. 28, 1991, elevation, 588.4 ft.
EXTREMES FOR CURRENT YEAR.-Maximum contents, 1,019,000 acre-ft, July 20, 21, maximum elevation, 866.24 ft, July 20; minimum, 583,000 acre-ft, Nov. 24, 25,
minimum elevation, 790.82 ft, Nov. 24.
Capacity table (elevation, in feet, and contents, in acre-feet)
(Based on table provided by Merced Irrigation District, dated June 1966)
590 67,900 640 137,800 720 317,800 840 845,800
600 79,900 660 173,500 750 415,900 860 975,700
610 92,800 680 215,200 780 534,500 870 1,046,000
620 106,700 700 263,000 820 729,600
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 634900 590000 583800 586900 642600 664800 685000 696900 728100 950900 1003000 894900
2 633800 589000 583800 587000 647800 663000 686400 697000 732700 971800 1000000 890800
3 631600 588700 583700 587500 676200 661000 686300 701700 737800 979000 997600 886500
4 629700 588500 583300 588000 682300 658400 686100 706800 741900 985800 995300 882200
5 628100 588400 583300 587400 679300 655800 689900 712100 744500 990400 992700 877800
6 626000 588300 583600 587500 679000 654700 690900 717700 749100 995000 990300 874200
7 624400 587800 584700 587600 685800 651900 692200 721600 757400 999000 987600 870300
8 622600 586900 586000 587900 694400 648500 694100 723800 777800 1003000 984900 866600
9 621300 586200 586700 588300 696800 645600 695100 724600 774500 1006000 982200 862500
10 619700 585800 586900 589200 694600 642400 695600 726800 781500 1009000 979000 858700
11 618600 586100 586900 590500 691200 639600 695700 728700 789200 1011000 975700 855100
12 617400 586200 586500 596300 685800 637200 694300 730800 796200 1012000 972400 852000
13 616000 585800 586800 600800 682700 637200 693400 732500 803000 1013000 968900 848400
14 614600 584900 586900 602800 684400 634400 692400 733600 810100 1014000 966300 844800
15 613000 584700 587300 625400 686900 633100 692000 733400 820700 1014000 963300 840700
16 611600 584800 587200 636600 683900 632100 691500 733000 833700 1014000 960400 836200
17 609000 585000 587400 639600 679800 631000 690800 731400 845900 1014000 958200 832300
18 607500 584900 587200 642100 674500 631400 688400 729800 855600 1016000 954800 827900
19 606300 584600 586900 648800 670600 631700 687200 728500 866400 1018000 950400 823400
20 604600 584300 587100 651100 670400 632100 685200 726800 872700 1019000 946500 819400
21 603400 583600 587400 652300 669900 633000 683400 724900 882200 1019000 942500 815400
22 601800 583800 587200 652900 675900 633800 682400 723500 896300 1018000 938200 811500
23 599900 583500 587000 653000 677300 634300 682700 723400 904800 1016000 934100 807900
24 598400 583000 586900 653100 677300 636700 684300 722900 911600 1015000 929900 804600
25 596700 583000 586900 652500 676300 639800 686700 721700 919000 1015000 925400 800700
26 595000 583500 586700 652400 673500 673700 688200 720900 926700 1014000 919500 796900
27 593900 583900 586500 652400 670700 681000 688600 720800 931700 1013000 917000 793100
28 592900 584000 586400 652000 667900 681200 688500 723100 939200 1011000 912500 789300
29 591900 584100 587100 653000 --- 683300 689000 726400 947700 1009000 908500 785700
30 590800 584000 586900 650100 --- 684800 690600 726700 959300 1007000 903600 781400
31 590200 --- 586900 646400 --- 685400 --- 726100 --- 1005000 899300 ---
MAX 634900 590000 587400 653100 696800 685400 695700 733600 959300 1019000 1003000 894900
MIN 590200 583000 583300 586900 642600 631000 682400 696900 728100 950900 899300 781400
a 792.40 791.05 791.68 804.09 808.35 811.74 812.72 819.36 857.59 864.24 848.50 829.20
b -47100 -6200 +2900 +59500 +21500 +17500 +5200 +35500 +233200 +45700 -105700 -117900
CAL YR 1997 b -177400
WTR YR 1998 b +144100
a Elevation, in feet, at the end of month.
b Change in contents, in acre-feet.
USGS Water Resources of California
Contact:
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Last modified: Wed Aug 4 09:40:30 PDT 1999