10344490 BOCA RESERVOIR NEAR TRUCKEE, CA
LOCATION.-Lat 39°23'20", long 120°05'43", in NE 1/4 NW 1/4 sec.28, T.18 N., R.17 E., Nevada County,
Hydrologic Unit 16050102, in control house at Boca Dam, on Little Truckee River, 1,800 ft upstream from mouth,
and 6.3 mi northeast of Truckee.
DRAINAGE AREA.-172 mi2.
PERIOD OF RECORD.-December 1938 to current year. Prior to October 1976 published as "at Boca." Monthend contents
only for December 1938 to September 1957, published in WSP 1734.
REVISED RECORDS.-WSP 1634: Drainage area.
GAGE.-Pressure gage with mercury column read most days. Datum of gage is sea level (levels by U.S. Bureau of
Reclamation).
REMARKS.-Reservoir is formed by earthfill, rock-faced dam. Storage began Dec. 8, 1938. Usable capacity, 40,868
acre-ft between elevations 5,521 ft, outlet sill, and 5,605 ft, top of spillway gates. Elevation of spillway
(gate open) is 5,589.01 ft. Dead contents, 241 acre-ft. Records, including extremes, represent usable contents at
0800 hours. Water is used for irrigation in the State of Nevada and for power development. See schematic diagram
of Truckee River Basin.
COOPERATION.-Records and capacity table were provided by U.S. Bureau of Reclamation; not rounded to U.S.
Geological Survey standards.
EXTREMES (at 0800 hours) FOR PERIOD OF RECORD.-Maximum contents, 41,440 acre-ft, Dec. 23, 1955, elevation,
5,605.55 ft; minimum,
37 acre-ft, Mar. 4-9, 1955, elevation, 5,521.65 ft.
EXTREMES (at 0800 hours) FOR CURRENT YEAR.-Maximum contents observed, 39,984 acre-ft, June 30, elevation,
5,604.09 ft; minimum, 29,437 acre-ft, Jan. 18, elevation, 5,592.36 ft.
Capacity table (elevation, in feet, and contents in acre-feet)
(Based on table provided by U.S. Bureau of Reclamation, dated November 1970)
5,540 2,356 5,570 13,768
5,545 3,513 5,580 20,002
5,550 4,970 5,590 27,488
5,555 6,725 5,600 36,128
5,560 8,778 5,605 40,868
RESERVOIR STORAGE (ACRE-FEET), WATER YEAR OCTOBER 1998 TO SEPTEMBER 1999
DAILY OBSERVATION AT 0800 HOURS
DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP
1 37623 33707 31568 32789 32815 33000 32370 34970 35990 39955 38036 35469
2 37492 33662 31682 32780 32859 33061 32353 35278 36220 39906 37942 35360
3 37351 33609 31789 32780 32842 33053 32283 35551 36811 39849 37839 35251
4 37202 33556 31962 32772 32886 32842 32179 35661 37389 39781 37745 35115
5 37062 33511 32083 32763 32886 32719 32101 35716 37660 39723 37651 34988
6 36886 33432 32240 32763 32929 32772 32127 35853 37632 39791 37613 34862
7 36719 33414 32300 32553 33123 32780 32083 36009 37604 39810 37585 34735
8 36534 33414 32405 32257 33114 32772 32023 36119 37707 39656 37548 34609
9 36377 33405 32440 31902 33273 32833 31971 36229 37876 39262 37520 34475
10 36192 33396 32483 31629 32737 32780 31884 36340 38046 38956 37538 34376
11 36018 33405 32509 31299 32222 32745 31833 36432 38216 38661 37529 34286
12 35844 33388 32544 30970 32405 32684 31772 36432 38367 38414 37510 34197
13 35679 33379 32579 30634 32448 32728 31789 36395 38519 38225 37492 34107
14 35506 33379 32605 30326 32483 32798 31850 36312 38680 38084 37398 34045
15 35342 33370 32640 30003 32509 32859 31945 36266 38842 37923 37314 33973
16 35215 33352 32675 29749 32536 32947 32075 36211 39042 37764 37211 33911
17 35088 33326 32710 29495 32632 33061 32257 36156 39243 37595 37090 33849
18 34970 33246 32745 29437 32632 33096 32492 36101 39444 37604 36979 33769
19 34862 33167 32780 29858 32702 33079 32772 36036 39473 37707 36858 33689
20 34744 33009 32824 30207 32719 33053 33105 35981 39512 37792 36746 33609
21 34618 32807 32859 30668 32807 32982 33370 35908 39540 37801 36635 33529
22 34501 32597 32886 31273 32824 32921 33229 35771 39569 37886 36524 33449
23 34394 32396 32894 31971 32649 32894 33317 35670 39608 37961 36432 33379
24 34286 32292 32894 32144 32710 32903 33388 35579 39656 38018 36321 33299
25 34197 32092 32903 32353 32798 32956 33467 35369 39665 38074 36211 33167
26 34098 31953 32912 32500 32868 32991 33556 35278 39694 38178 36110 33035
27 33982 31807 32921 32579 32877 32965 33671 35297 39723 38235 36009 32903
28 33875 31699 32912 32632 32886 32903 34027 35306 39887 38282 35908 32754
29 33849 31577 32877 32684 --- 32815 34385 35460 39935 38291 35807 32614
30 33778 31533 32833 32737 --- 32710 34385 35643 39984 38225 35697 32483
31 33724 --- 32798 32789 --- 32553 --- 35816 --- 38131 35579 ---
MAX 37623 33707 32921 32789 33273 33096 34385 36432 39984 39955 38036 35469
MIN 33724 31533 31568 29437 32222 32553 31772 34970 35990 37595 35579 32483
a 5597.34 5594.81 5596.29 5596.28 5596.39 5596.01 5598.08 5599.66 5604.09 5602.15 5599.40 5595.93
b -4011 -2191 +1265 -9 +97 -333 +1832 +1431 +4168 -1853 -2552 -3096
CAL YR 1998 MAX 39704 MIN 18491 b +14340
WTR YR 1999 MAX 39984 MIN 29437 b -5252
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