2001 California Hydrologic Data Report
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 mi".
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 Exchequer Powerplant (station 11269700) down the Merced River to a diversion dam for
Merced Irrigation District's main canal.
COOPERATION - Records were provided by Pacific Gas and Electric Co., 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, 774,500 acre-ft, May 26, elevation, 828.02 ft; minimum,
440,500 acre-ft, Sept. 30, minimum elevation, 756.72 ft. 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 2000 TO SEPTEMBER 2001
DAILY OBSERVATION AT 2400 HOURS
DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP
1 686000 627600 601900 592200 588300 604200 666800 694200 770400 685900 577600 485600
2 683900 627400 601300 591600 588200 605000 668900 700800 769600 682400 574100 483500
3 682700 627700 601500 591300 588200 606300 669500 704900 767800 678900 570600 481400
4 680600 627300 600900 590800 588600 610400 669000 707400 765600 675200 567400 479600
5 679000 626300 600200 590400 588700 618300 668700 710900 762600 671800 564100 477600
6 679000 626100 599600 590000 588600 623500 668300 715100 760100 668300 560800 475600
7 675500 626100 599000 589500 588200 624600 667800 719400 757900 664700 557400 473900
8 673700 625500 598500 589100 588300 626800 667500 725100 755500 661200 554000 471800
9 672000 624500 598200 588700 588200 627700 667900 730200 753200 658500 550600 470500
10 670600 623400 597900 588800 589000 629200 667400 734000 750600 655300 547300 468800
11 669300 622400 597300 589300 590400 630500 667100 737600 748400 651800 544200 467100
12 668100 621500 597000 589000 590900 631100 667400 741800 746200 648600 541300 465500
13 666800 620500 596400 588900 591000 631400 667400 744200 743100 645200 537900 463600
14 665300 619700 596000 588500 591100 632500 667300 745600 740000 641500 534600 462100
15 662700 618700 595600 588200 591100 633700 667100 747100 737600 637700 531400 460400
16 659900 618100 595900 587300 591300 634600 667600 749600 734600 634100 528600 458700
17 657500 617200 596100 586600 591900 634300 668000 754800 732500 631300 525400 457300
18 655100 616400 595500 586300 592600 636300 666700 758400 728700 627500 521900 455800
19 653200 615600 594900 586200 593200 637000 666000 761200 725600 623600 518800 454300
20 651000 615000 594800 586400 595500 639100 665400 763700 722400 619900 515500 452900
21 648100 613400 594600 586700 596400 641200 665700 765800 719200 616800 512600 451500
22 644700 611500 594300 586300 598000 643400 665600 768300 716300 613400 509700 450300
23 641600 609800 594500 586000 598400 645100 664700 770600 713200 610200 506600 449100
24 638600 609000 594700 587200 599500 646900 665400 772600 709800 607100 504100 447800
25 636000 607600 594300 587700 601400 649200 666600 773800 706400 603000 501500 446600
26 633600 605500 594100 588000 601800 650800 669600 774500 703200 599200 499400 445500
27 631500 604300 593900 588600 602400 652000 673500 774400 700100 595800 497300 444300
28 629700 603800 593500 589000 603400 654400 679000 773900 696600 592100 495100 443000
29 629400 603000 592900 588900 --- 655700 683500 773100 693000 588600 492700 441800
30 628700 602500 592700 588700 --- 658100 687400 772400 689300 585000 490200 440500
31 627900 --- 592400 588400 --- 661500 --- 771500 --- 581100 487900 ---
MAX 686000 627700 601900 592200 603400 661500 687400 774500 770400 685900 577600 485600
MIN 627900 602500 592400 586000 588200 604200 664700 694200 689300 581100 487900 440500
a 800.30 795.04 792.87 792.05 795.12 807.12 812.17 827.48 812.48 790.44 768.85 756.72
b -59600 -25400 -10100 -4000 +15000 +58100 +25900 +84100 -82200 -108200 -93200 -47400
c 64650 14290 15810 17930 14140 26730 82980 136900 120500 116800 90470 43650
CAL YR 2000 b -13100
WTR YR 2001 b -247000
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