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)
Feb. 21 0800 413 3.50
DISCHARGE, CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1995 TO SEPTEMBER 1996
DAILY MEAN VALUES
DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP
1 8.4 6.6 6.3 5.8 7.0 16 16 11 5.8 e4.9 e3.9 e2.8
2 8.4 6.5 6.3 5.8 7.1 15 17 10 5.6 e4.9 e3.8 e3.0
3 8.4 6.6 6.3 5.7 6.8 14 17 10 5.3 e4.9 e3.8 e2.8
4 8.0 6.6 6.3 5.6 6.5 17 17 9.9 5.3 e4.9 3.8 2.8
5 8.0 6.3 6.3 5.7 6.5 42 16 9.7 5.9 e4.8 e3.7 e2.8
6 7.6 6.3 6.3 5.7 6.2 32 16 9.5 5.8 e4.8 e3.7 e2.8
7 7.6 6.3 6.5 5.6 6.3 27 15 9.4 5.6 e4.8 e3.6 e2.7
8 7.6 6.3 6.8 5.7 6.3 23 14 9.4 e5.4 e4.8 e3.5 e2.7
9 7.6 6.0 6.7 5.6 6.2 21 15 9.4 e5.4 e4.7 e3.5 e2.6
10 8.0 5.9 6.6 5.7 6.2 19 15 9.2 e5.4 e4.7 3.4 2.6
11 8.0 5.9 6.4 5.7 6.4 18 15 8.8 e5.4 e4.7 3.4 e2.6
12 7.4 5.9 6.5 5.6 6.6 21 14 8.5 e5.4 e4.7 3.4 e2.5
13 7.3 5.9 6.9 5.7 6.7 24 14 8.1 e5.3 4.8 3.1 e2.5
14 7.3 5.9 6.2 5.6 7.1 22 14 8.0 e5.3 e4.6 3.3 e2.4
15 7.3 5.9 5.8 5.7 7.1 22 13 7.7 e5.3 e4.6 3.4 e2.4
16 7.3 5.9 5.9 5.7 7.2 22 13 7.6 e5.3 4.6 3.3 e2.3
17 7.0 5.9 5.9 5.7 7.3 23 13 7.6 e5.2 4.6 3.2 e2.3
18 6.9 5.9 5.8 5.8 6.6 24 14 7.6 e5.2 4.5 3.2 e2.2
19 7.0 5.9 5.7 5.7 6.1 25 14 7.3 e5.2 4.5 3.2 e2.2
20 7.3 5.9 5.7 5.7 123 24 14 7.2 e5.2 4.4 3.1 e2.2
21 7.3 5.9 5.8 6.0 268 22 13 7.2 e5.1 4.4 e3.1 e2.1
22 6.9 5.9 5.8 5.7 113 22 13 7.2 e5.1 4.3 e3.1 e2.1
23 6.9 5.9 6.0 5.4 60 21 12 7.1 e5.1 4.2 e3.0 e2.1
24 6.9 6.2 5.8 5.4 41 20 12 7.4 e5.1 e4.2 e3.0 e2.0
25 6.8 6.3 5.9 5.3 32 19 11 7.3 e5.1 e4.1 e3.0 e2.0
26 6.6 6.3 5.9 5.2 25 18 11 6.9 e5.0 e4.1 e3.0 e2.0
27 6.9 6.3 5.9 5.2 21 18 11 6.9 e5.0 e4.0 e3.0 e2.0
28 6.9 6.3 5.9 5.1 19 17 11 6.8 e5.0 e4.0 e2.9 e1.9
29 6.9 6.3 5.9 5.1 17 18 11 6.2 e5.0 e4.0 e2.9 e1.9
30 6.9 6.3 5.9 5.1 --- 17 11 6.1 e4.9 e3.9 e2.9 1.9
31 6.8 --- 5.9 6.3 --- 16 --- 6.0 --- e3.9 e2.9 ---
TOTAL 228.2 184.1 189.9 173.6 845.2 659 412 251.0 158.7 139.3 102.1 71.2
MEAN 7.36 6.14 6.13 5.60 29.1 21.3 13.7 8.10 5.29 4.49 3.29 2.37
MAX 8.4 6.6 6.9 6.3 268 42 17 11 5.9 4.9 3.9 3.0
MIN 6.6 5.9 5.7 5.1 6.1 14 11 6.0 4.9 3.9 2.9 1.9
AC-FT 453 365 377 344 1680 1310 817 498 315 276 203 141
e Estimated.
10263500 BIG ROCK CREEK NEAR VALYERMO, CA--Continued
STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1923 - 1996, BY WATER YEAR (WY)
OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP
MEAN 5.21 7.54 10.5 19.0 31.3 38.7 31.4 27.8 18.9 11.0 7.93 6.32
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 1995 CALENDAR YEAR FOR 1996 WATER YEAR WATER YEARS 1923 - 1996
ANNUAL TOTAL 13116.1 3414.3
ANNUAL MEAN 35.9 9.33 18.0
HIGHEST ANNUAL MEAN 90.9 1978
LOWEST ANNUAL MEAN 1.91 1951
HIGHEST DAILY MEAN 321 Mar 11 268 Feb 21 3300 Mar 2 1938
LOWEST DAILY MEAN 3.6 Jan 1 1.9 Sep 28 .70 Nov 5 1951
ANNUAL SEVEN-DAY MINIMUM 5.2 Jan 1 2.0 Sep 24 .87 Nov 3 1951
INSTANTANEOUS PEAK FLOW 413 Feb 21 8300 Mar 2 1938
INSTANTANEOUS PEAK STAGE 3.50 Feb 21
ANNUAL RUNOFF (AC-FT) 26020 6770 13020
10 PERCENT EXCEEDS 80 17 37
50 PERCENT EXCEEDS 21 6.0 7.5
90 PERCENT EXCEEDS 6.0 3.0 2.7
USGS Water Resources of California
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