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 those 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; 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)
Dec. 22 1300 53 2.35 Jan. 26 0530 120 2.73
DISCHARGE, CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1996 TO SEPTEMBER 1997
DAILY MEAN VALUES
DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP
1 1.8 2.2 3.4 14 26 9.9 8.8 6.8 e4.1 e3.4 e2.2 e1.7
2 1.7 2.1 3.4 21 24 9.9 8.8 6.7 e4.0 e3.3 e2.2 e1.7
3 1.8 2.1 3.4 35 22 9.8 9.0 6.6 e4.0 e3.3 e2.1 e1.6
4 1.7 2.1 3.6 25 20 9.9 8.8 6.4 e3.9 e3.3 e2.1 e1.6
5 1.7 2.1 3.6 19 19 10 8.7 6.3 e3.9 e3.3 e2.1 e1.6
6 1.7 2.2 3.6 17 17 9.9 8.6 6.2 e3.9 e3.2 e2.0 e1.6
7 1.7 2.3 3.6 15 17 9.9 8.4 6.2 e3.9 e3.2 e2.0 e1.6
8 1.6 2.3 3.6 13 16 9.6 8.3 6.1 e3.9 e3.2 e2.0 e1.6
9 1.6 2.2 10 12 16 9.2 8.3 5.9 e3.9 e3.1 e2.0 e1.5
10 1.6 2.2 23 12 15 8.6 8.2 5.9 e3.9 e3.1 e2.0 e1.5
11 1.7 2.2 22 11 13 8.6 8.0 5.8 e3.9 e3.1 e1.9 e1.5
12 1.8 2.2 19 11 13 8.6 7.9 5.7 e3.9 e3.0 e1.9 e1.5
13 1.8 2.2 12 12 12 8.9 7.8 5.6 e3.9 e3.0 e1.9 e1.5
14 1.8 2.1 9.2 10 12 9.0 7.8 5.6 e3.9 e2.9 e1.9 e1.5
15 1.8 2.1 8.0 11 13 8.9 7.7 5.3 e3.9 e2.9 e1.9 e1.5
16 1.8 2.2 7.6 11 12 8.9 7.5 e5.2 e3.9 e2.8 e1.9 e1.5
17 1.8 2.2 7.3 10 13 9.0 7.4 e5.2 e3.9 e2.8 e1.9 e1.5
18 1.8 2.3 6.9 10 13 8.9 7.4 e5.2 e3.9 e2.8 e1.9 e1.5
19 1.9 2.3 6.6 10 12 8.7 8.0 e5.2 e3.9 e2.7 e1.9 e1.5
20 1.9 2.3 6.6 11 12 8.6 8.3 e5.1 e3.8 e2.7 e1.8 e1.5
21 1.9 2.5 6.6 11 11 8.6 8.1 e5.0 e3.8 e2.7 e1.8 e1.5
22 1.9 5.8 28 11 10 8.6 8.0 e4.9 e3.7 e2.6 e1.8 e1.5
23 1.9 5.2 22 14 10 8.6 7.9 e4.8 e3.7 e2.6 e1.8 e1.5
24 1.9 4.3 14 15 10 8.6 7.3 e4.7 e3.7 e2.6 e1.8 e1.5
25 2.0 4.0 10 21 10 8.6 7.2 e4.6 e3.6 e2.5 e1.8 e1.5
26 2.1 3.9 9.6 69 10 8.6 7.1 e4.6 e3.6 e2.5 e1.8 e1.5
27 2.1 3.7 9.2 57 10 8.5 7.1 e4.5 e3.5 e2.4 e1.7 e1.5
28 2.1 3.6 12 38 10 8.5 7.0 e4.4 e3.5 e2.4 e1.7 e1.5
29 2.1 3.6 12 35 --- 8.4 7.0 e4.4 e3.4 e2.3 e1.7 e1.5
30 2.7 3.5 11 33 --- 8.3 6.8 e4.3 e3.4 e2.3 e1.7 e1.5
31 2.2 --- 13 29 --- 8.6 --- e4.2 --- e2.3 e1.7 ---
TOTAL 57.9 84.0 313.8 623 398 278.7 237.2 167.4 114.2 88.3 58.9 46.0
MEAN 1.87 2.80 10.1 20.1 14.2 8.99 7.91 5.40 3.81 2.85 1.90 1.53
MAX 2.7 5.8 28 69 26 10 9.0 6.8 4.1 3.4 2.2 1.7
MIN 1.6 2.1 3.4 10 10 8.3 6.8 4.2 3.4 2.3 1.7 1.5
AC-FT 115 167 622 1240 789 553 470 332 227 175 117 91
e Estimated.
STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1923 - 1997, BY WATER YEAR (WY)
DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP
MEAN 5.16 7.48 10.5 19.0 31.1 38.3 31.1 27.5 18.7 10.9 7.85 6.27
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 1996 CALENDAR YEAR FOR 1997 WATER YEAR WATER YEARS 1923 - 1997
ANNUAL TOTAL 3267.8 2467.4
ANNUAL MEAN 8.93 6.76 17.8
HIGHEST ANNUAL MEAN 90.9 1978
LOWEST ANNUAL MEAN 1.91 1951
HIGHEST DAILY MEAN 268 Feb 21 69 Jan 26 3300 Mar 2 1938
LOWEST DAILY MEAN 1.6 Oct 8 1.5 Sep 9 .70 Nov 5 1951
ANNUAL SEVEN-DAY MINIMUM 1.7 Oct 4 1.5 Sep 9 .87 Nov 3 1951
INSTANTANEOUS PEAK FLOW 120 Jan 26 8300 Mar 2 1938
INSTANTANEOUS PEAK STAGE 2.73 Jan 26 2.73 Jan 26 1997
ANNUAL RUNOFF (AC-FT) 6480 4890 12910
10 PERCENT EXCEEDS 18 13 37
50 PERCENT EXCEEDS 5.3 3.9 7.4
90 PERCENT EXCEEDS 2.1 1.7 2.6
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Last modified: Wed Mar 10 14:06:24 PST 1999