10263500 BIG ROCK CREEK NEAR VALYERMO, CA
LOCATION.-Lat 34°25'15", long 117°50'19", in SE 1/4 NE 1/4 sec.20, T.4 N., R.9 W., Los Angeles County,
Hydrologic Unit 18090206, on left bank, 0.1 mi upstream from Punchbowl Canyon, and 1.9 mi southeast of Valyermo.
DRAINAGE AREA.-22.9 mi2.
PERIOD OF RECORD.-January 1923 to current year. Monthly discharge only for June 1938 to January 1939, published
in WSP 1314. Prior to October 1954, published as Rock Creek near Valyermo.
REVISED RECORDS.-WSP 1314: 1938-39. WSP 1564: 1932, 1937, 1939(M). WSP 1927: Drainage area.
GAGE.-Water-stage recorder and concrete control. Elevation of gage is 4,050 ft above sea level, from topographic
map. Prior to May 4, 1938, at same site at different datums. May 4, 1938, to Jan. 26, 1939, at site 0.2 mi
downstream (below Punchbowl Canyon) at different datum.
REMARKS.-Records good except for estimated daily discharges, which are poor. No regulation or diversion upstream
from station.
EXTREMES FOR PERIOD OF RECORD.-Maximum discharge, 8,300 ft3/s, Mar. 2, 1938, gage height unknown, on
basis of slope-area measurement of peak flow; maximum gage height, 7.70 ft, Jan. 25, 1969; minimum daily, 0.70
ft3/s, Nov. 5, 1951.
EXTREMES FOR CURRENT YEAR.-Peak discharges greater than base discharge of 50 ft3/s, or maximum:
Discharge Gage height Discharge Gage height
Date Time (ft3/s) (ft) Date Time (ft3/s) (ft)
June 19 1730 26 2.07
DISCHARGE, CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1998 TO SEPTEMBER 1999
DAILY MEAN VALUES
DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP
1 11 9.1 8.4 8.4 6.3 6.5 6.1 8.4 4.1 2.8 2.7 2.2
2 11 9.5 8.6 8.2 6.3 6.3 6.3 7.8 4.6 3.1 2.7 2.3
3 11 9.4 8.8 7.6 6.1 6.3 6.3 7.6 4.2 3.7 2.7 2.6
4 11 9.2 9.2 7.6 5.9 6.3 6.3 7.5 4.2 3.6 2.7 2.4
5 11 9.2 9.2 7.6 5.9 6.1 6.3 7.9 4.4 3.7 2.6 2.1
6 11 9.5 10 7.6 6.1 5.9 6.4 7.9 5.1 3.8 2.6 2.0
7 11 9.6 9.6 7.6 6.1 5.9 6.6 7.3 5.1 3.6 2.7 2.0
8 11 11 9.6 7.6 5.9 5.9 6.6 e7.4 4.5 3.7 2.9 1.9
9 10 12 9.6 7.6 6.5 5.9 6.6 e7.6 4.5 3.7 2.7 2.0
10 10 12 9.6 7.6 7.4 5.9 6.6 7.8 4.4 3.7 2.6 2.1
11 10 13 9.6 7.6 7.6 5.9 6.6 7.5 4.3 3.6 2.6 2.0
12 9.9 13 9.4 7.6 7.6 5.9 7.6 7.1 4.3 3.4 2.6 e2.0
13 9.8 13 9.2 7.5 7.4 6.0 7.4 7.1 4.1 3.5 2.5 e2.0
14 9.6 12 9.2 7.3 7.1 6.0 6.8 6.9 3.9 3.4 2.5 e2.0
15 9.5 12 9.2 7.3 6.9 6.3 8.7 6.9 3.6 e3.1 2.4 e2.0
16 9.9 12 8.8 7.3 6.9 6.3 9.3 6.5 3.6 2.7 2.4 2.0
17 9.7 12 8.8 7.3 7.5 6.2 9.1 6.2 3.5 2.6 2.3 2.0
18 9.5 11 8.6 7.3 7.8 6.1 9.3 6.0 3.4 2.5 2.3 2.0
19 9.4 11 8.5 7.3 7.7 6.0 9.5 6.0 4.2 2.4 e2.3 e2.2
20 9.1 11 9.1 7.3 7.5 6.2 9.8 5.6 3.5 2.6 e2.2 2.4
21 9.2 11 9.6 6.7 7.3 6.3 9.9 5.6 3.3 2.9 2.2 2.4
22 9.3 10 9.4 6.6 7.3 6.2 9.6 5.7 3.8 2.8 2.2 2.4
23 9.2 9.7 9.2 6.3 7.3 5.9 9.5 6.0 3.7 2.7 2.1 2.6
24 9.2 9.2 9.1 6.0 7.3 5.7 9.3 6.1 e3.9 e2.8 e2.2 2.6
25 9.2 9.1 8.8 6.9 7.3 5.6 8.7 6.1 e4.0 e2.9 e2.3 2.6
26 9.2 8.7 8.6 6.8 7.2 5.7 8.2 5.4 4.1 e2.9 2.3 e2.6
27 9.4 8.4 8.4 6.6 6.9 5.7 8.3 4.9 3.9 e3.0 2.1 e2.6
28 9.4 11 8.4 6.5 6.8 5.7 8.8 4.7 3.6 3.0 e2.1 e2.7
29 9.1 9.4 8.4 6.3 --- 5.9 9.0 4.6 3.5 2.6 e2.0 e2.7
30 9.2 8.6 8.4 6.3 --- 5.9 8.8 5.2 2.9 2.8 2.0 e2.7
31 9.1 --- 8.4 6.3 --- 5.9 --- 4.7 --- 2.8 2.2 ---
TOTAL 305.9 315.6 279.7 222.5 193.9 186.4 238.3 202.0 120.2 96.4 74.7 68.1
MEAN 9.87 10.5 9.02 7.18 6.92 6.01 7.94 6.52 4.01 3.11 2.41 2.27
MAX 11 13 10 8.4 7.8 6.5 9.9 8.4 5.1 3.8 2.9 2.7
MIN 9.1 8.4 8.4 6.0 5.9 5.6 6.1 4.6 2.9 2.4 2.0 1.9
AC-FT 607 626 555 441 385 370 473 401 238 191 148 135
e Estimated.
STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1923 - 1999, BY WATER YEAR (WY)
OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP
MEAN 5.18 7.45 10.4 18.7 31.4 38.1 31.1 28.2 19.2 11.1 7.95 6.29
MAX 19.0 116 67.0 245 303 432 144 120 91.4 42.2 26.5 19.7
(WY) 1984 1966 1947 1969 1980 1978 1978 1941 1978 1983 1983 1983
MIN 1.05 1.09 1.80 2.10 2.39 2.40 2.67 2.35 1.61 1.15 1.09 1.01
(WY) 1952 1952 1991 1951 1951 1951 1951 1951 1961 1961 1961 1961
SUMMARY STATISTICS FOR 1998 CALENDAR YEAR FOR 1999 WATER YEAR WATER YEARS 1923 - 1999
ANNUAL TOTAL 13846.0 2303.7
ANNUAL MEAN 37.9 6.31 17.9
HIGHEST ANNUAL MEAN 90.9 1978
LOWEST ANNUAL MEAN 1.91 1951
HIGHEST DAILY MEAN 730 Feb 23 13 Nov 11 3300 Mar 2
1938
LOWEST DAILY MEAN 4.8 Jan 1 1.9 Sep 8 .70 Nov 5
1951
ANNUAL SEVEN-DAY MINIMUM 4.9 Jan 1 2.0 Sep 6 .87 Nov 3
1951
INSTANTANEOUS PEAK FLOW 26 Jun 19 8300 Mar 2
1938
INSTANTANEOUS PEAK STAGE 2.07 Jun 19 7.70 Jan 25
1969
ANNUAL RUNOFF (AC-FT) 27460 4570 12980
10 PERCENT EXCEEDS 86 9.6 38
50 PERCENT EXCEEDS 24 6.3 7.5
90 PERCENT EXCEEDS 8.4 2.4 2.6
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