11180900 CROW CREEK NEAR HAYWARD, CA
LOCATION.-Lat 37°42'18", long 122°02'34", in San Lorenzo Grant, Alameda County, Hydrologic Unit
18050004, on right bank on the upstream side of Crow Canyon Road bridge, 0.4 mi east of Canyon High School, 0.8
mi upstream of confluence of Cull Creek, and 2.3 mi northeast of Castro Valley.
DRAINAGE AREA.-10.51 mi2.
PERIOD OF RECORD.-October 1997 to current year.
GAGE.-Water-stage recorder and crest-stage gage. Elevation of gage is 270 ft above sea level, from topographic
map.
REMARKS.-Records good except for estimated daily discharges, which are fair. No regulation or diversion upstream
from station.
EXTREMES FOR PERIOD OF RECORD.-Maximum discharge, 1,990 ft3/s, Feb. 3, 1998, gage height, 13.07, from
rating curve extended above 700 ft3/s; minimum daily, 0.05 ft3/s, Oct. 1, 1997.
EXTREMES FOR CURRENT YEAR.-Peak discharges greater than base discharge of 350 ft3/s, or maximum:
Discharge Gage height Discharge Gage height
Date Time (ft3/s) (ft) Date Time (ft3/s) (ft)
Feb. 7 1045 783 8.90 Feb. 17 0130 386 6.90
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 e.65 1.3 3.0 1.4 4.9 19 7.9 4.7 1.8 .97 .66 .44
2 e.51 1.3 2.0 1.4 4.3 16 6.8 4.4 1.8 .94 .65 .43
3 e.46 1.3 e3.2 1.3 4.1 22 7.5 4.3 1.7 .92 .62 .40
4 e.41 1.4 2.0 1.3 3.8 14 7.0 4.4 1.7 .99 .68 .42
5 e.37 1.4 4.2 1.3 3.4 13 6.1 4.4 1.7 .97 .73 .41
6 e.43 1.6 2.9 1.4 28 12 6.4 4.2 1.6 .91 1.1 .40
7 .40 3.1 1.7 1.4 263 11 5.5 4.1 1.5 .91 .65 .38
8 .48 2.0 1.7 1.4 57 18 20 3.9 1.5 .88 .56 .44
9 .49 .85 1.6 1.3 151 46 8.1 3.6 1.5 .85 .57 .39
10 .46 .80 1.5 e1.2 50 17 6.0 3.5 1.5 .80 .59 .42
11 .44 .77 1.5 e1.2 36 15 5.4 3.4 1.5 .77 .64 .43
12 .42 .69 1.5 e1.4 29 14 5.4 3.3 1.5 .76 .61 .42
13 .46 .68 e4.6 e1.2 27 13 5.4 3.2 1.6 .70 .58 .42
14 .49 .69 1.7 e1.2 23 16 6.5 3.0 1.4 .71 .55 .46
15 .49 .69 1.5 e2.6 19 20 5.4 3.0 1.3 .75 .48 .51
16 .43 .69 1.4 e5.7 52 13 4.4 3.1 1.4 .80 .49 .49
17 .37 .81 1.4 e2.0 121 12 4.2 3.3 1.4 .82 .50 .56
18 .35 .70 1.4 e8.3 53 11 4.1 3.1 1.5 .78 .55 .37
19 .37 .69 1.4 e32 38 12 5.3 2.4 1.5 .75 .58 .37
20 .36 .68 1.5 e36 67 11 13 2.3 1.5 .74 .50 .49
21 .36 e.74 1.3 e13 87 11 4.6 2.2 1.4 .68 .49 .39
22 .36 .98 1.4 e4.0 45 10 26 2.2 1.4 .68 .41 1.2
23 .41 e2.9 1.4 29 36 10 15 2.1 1.4 .66 .40 .40
24 3.9 1.4 1.3 7.8 31 15 5.7 2.0 1.3 .71 .40 .35
25 1.4 .77 1.4 5.7 39 24 23 1.9 1.2 .70 .40 .35
26 1.2 .80 1.4 12 27 11 17 2.0 1.2 .68 .39 .32
27 1.2 1.4 1.4 6.3 23 9.7 7.2 2.1 1.2 .69 .37 .40
28 1.3 1.5 1.4 4.9 21 9.1 6.3 2.0 1.1 .67 .39 .28
29 1.4 e2.0 1.4 4.4 --- 8.9 5.6 1.9 1.0 .63 .41 .28
30 1.3 e16 1.4 4.2 --- 9.0 5.2 1.9 .99 .61 .44 .28
31 1.2 --- 1.4 14 --- 10 --- 1.8 --- .64 .45 ---
TOTAL 22.87 50.63 56.9 210.3 1343.5 452.7 256.0 93.7 43.09 24.07 16.84 12.90
MEAN .74 1.69 1.84 6.78 48.0 14.6 8.53 3.02 1.44 .78 .54 .43
MAX 3.9 16 4.6 36 263 46 26 4.7 1.8 .99 1.1 1.2
MIN .35 .68 1.3 1.2 3.4 8.9 4.1 1.8 .99 .61 .37 .28
AC-FT 45 100 113 417 2660 898 508 186 85 48 33 26
e Estimated.
STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1998 - 1999, BY WATER YEAR (WY)
OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP
MEAN .47 1.31 2.47 28.6 85.1 18.2 12.2 4.59 2.36 1.18 .65 .52
MAX .74 1.69 3.11 50.4 122 21.8 16.0 6.16 3.28 1.58 .77 .61
(WY) 1999 1999 1998 1998 1998 1998 1998 1998 1998 1998 1998 1998
MIN .20 .94 1.84 6.78 48.0 14.6 8.53 3.02 1.44 .78 .54 .43
(WY) 1998 1998 1999 1999 1999 1999 1999 1999 1999 1999 1999 1999
SUMMARY STATISTICS FOR 1998 CALENDAR YEAR FOR 1999 WATER YEAR WATER YEARS 1998 - 1999
ANNUAL TOTAL 6648.11 2583.50
ANNUAL MEAN 18.2 7.08 12.6
HIGHEST ANNUAL MEAN 18.2 1998
LOWEST ANNUAL MEAN 7.08 1999
HIGHEST DAILY MEAN 465 Feb 3 263 Feb 7 465 Feb 3
1998
LOWEST DAILY MEAN .35 Oct 18 .28 Sep 28 .05 Oct 1
1997
ANNUAL SEVEN-DAY MINIMUM .37 Oct 17 .32 Sep 24 .13 Oct 1
1997
INSTANTANEOUS PEAK FLOW 783 Feb 7 1990 Feb 3
1998
INSTANTANEOUS PEAK STAGE 8.90 Feb 7 13.07 Feb 3
1998
ANNUAL RUNOFF (AC-FT) 13190 5120 9160
10 PERCENT EXCEEDS 52 17 26
50 PERCENT EXCEEDS 2.7 1.4 1.6
90 PERCENT EXCEEDS .59 .42 .40
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