11181000 SAN LORENZO CREEK AT HAYWARD, CA
LOCATION.-Lat 37°41'08", long 122°03'48", in San Lorenzo Grant, Alameda County, Hydrologic Unit
18050004, on left bank, 300 ft downstream of Center Street Bridge, just outside city limits of Hayward, 0.6 mi
downstream from Crow Creek, and 1.0 mi downstream from Don Castro Dam.
DRAINAGE AREA.-37.5 mi2.
PERIOD OF RECORD.-October 1939 to September 1940, October 1946 to Apr. 28, 1983; October 1997 to current year.
Monthly discharge only for some periods, published in WSP 1315-B.
REVISED RECORDS.-WSP 1315-B: 1947(M), 1949(M). WSP 1345: 1940(M). WSP 1715: 1947.
GAGE.-Water-stage recorder and crest-stage gage. Datum of gage is 133.16 ft above sea level. January to
September 1940, nonrecording gage on bridge 0.1 mi upstream at present datum.
REMARKS.-Records fair including estimated daily discharges. Flow partly regulated since October 1962 by Cull
Creek Reservoir, capacity, 310 acre-ft, and since January 1965 by Don Castro Reservoir, 1.0 mi upstream,
capacity, 380 acre-ft. A few very small diversions above station for irrigation.
EXTREMES FOR PERIOD OF RECORD.-Maximum discharge, 8,140 ft3/s, Feb. 3, 1998, gage height, 21.85 ft; no
flow at times.
EXTREMES FOR CURRENT YEAR.-Peak discharges greater than base discharge of 550 ft3/s, or maximum:
Discharge Gage height Discharge Gage height
Date Time (ft3/s) (ft) Date Time (ft3/s) (ft)
Feb. 7 unknown 2,690 13.42
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 1.4 e.64 e14 2.0 e29 37 21 13 8.5 3.7 2.0 e1.1
2 1.8 e.65 e1.8 2.0 e26 33 20 13 8.5 3.5 1.9 e1.1
3 2.0 e.67 e5.9 2.0 e24 44 18 16 8.3 3.1 1.8 e1.2
4 .90 e.72 e1.9 1.8 e23 30 17 13 8.2 3.2 1.8 e1.1
5 .92 e.80 e3.3 1.8 e21 29 40 12 7.9 3.1 2.0 e1.0
6 .52 e1.6 e8.1 1.9 e51 28 25 12 7.7 3.1 4.0 e.98
7 .48 e6.9 1.6 1.9 e600 26 19 11 7.6 3.2 2.7 e1.2
8 .77 e4.5 1.3 e2.1 e150 36 73 11 7.9 3.0 2.0 e1.4
9 .54 e.74 2.9 e2.0 e520 87 30 11 7.8 2.7 2.0 e1.5
10 .44 e.73 2.9 e2.1 e120 36 27 10 7.1 2.6 2.1 e1.4
11 .42 e.71 3.9 e2.1 e65 30 61 9.4 7.1 2.6 2.4 1.3
12 .42 e.55 3.8 e2.2 e47 26 33 9.7 7.2 2.5 2.3 1.3
13 .50 e.53 8.6 e1.8 e41 28 28 9.4 7.2 2.8 2.1 1.2
14 .98 e.46 4.6 2.2 e37 40 25 8.6 7.2 3.0 2.0 1.3
15 .66 e.44 2.6 8.0 e34 48 24 8.6 7.4 2.7 1.8 1.4
16 .55 e.43 2.5 17 e66 32 22 8.6 7.1 2.8 1.7 1.3
17 .66 e1.1 2.5 2.8 e200 27 22 9.7 6.2 2.9 1.6 1.6
18 .41 e.40 3.7 54 e98 26 21 10 5.6 2.7 1.7 1.5
19 e.36 e.37 2.6 75 66 32 20 9.4 5.9 2.7 1.8 1.5
20 e.35 e.40 3.8 122 119 27 20 9.4 4.8 2.7 1.7 1.4
21 e.34 e.97 1.3 30 171 25 18 9.2 4.6 2.6 1.6 1.5
22 e.34 e4.0 1.1 19 82 26 18 9.2 4.7 2.4 1.4 5.7
23 e.39 e15 1.3 78 62 28 16 9.1 4.3 2.4 1.3 3.1
24 e9.5 e1.3 1.4 29 53 33 16 9.0 4.4 2.5 1.3 2.2
25 e.66 e.74 1.2 20 78 50 16 9.2 4.6 2.4 1.4 2.1
26 e.61 e.70 1.5 46 51 30 16 8.9 5.6 2.3 1.3 1.9
27 e.55 e.82 1.7 26 45 27 15 8.8 5.3 2.3 e1.2 1.8
28 e.56 e1.9 2.4 19 39 24 14 8.8 4.5 2.2 e1.3 1.6
29 e.62 e12 1.8 17 --- 24 13 8.6 3.9 2.1 e1.3 1.5
30 e.60 e66 2.7 15 --- 24 13 8.5 4.5 2.0 e1.3 1.5
31 e.58 --- 2.3 66 --- 28 --- 8.0 --- 2.0 e1.2 ---
TOTAL 29.83 126.77 101.0 671.7 2918 1021 721 312.1 191.6 83.8 56.0 48.68
MEAN .96 4.23 3.26 21.7 104 32.9 24.0 10.1 6.39 2.70 1.81 1.62
MAX 9.5 66 14 122 600 87 73 16 8.5 3.7 4.0 5.7
MIN .34 .37 1.1 1.8 21 24 13 8.0 3.9 2.0 1.2 .98
AC-FT 59 251 200 1330 5790 2030 1430 619 380 166 111 97
e Estimated.
STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1940 - 1999, BY WATER YEAR (WY)
OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP
MEAN 3.71 3.59 21.2 55.5 54.5 37.7 25.3 5.69 2.35 1.05 .72 .62
MAX 107 30.1 184 227 327 267 255 21.3 9.03 5.22 4.58 2.89
(WY) 1963 1951 1956 1952 1998 1983 1958 1967 1967 1982 1980 1968
MIN .000 .000 .13 .39 .73 .84 .29 .12 .043 .000 .000 .000
(WY) 1947 1949 1949 1949 1948 1972 1977 1976 1977 1961 1947 1947
SUMMARY STATISTICS FOR 1998 CALENDAR YEAR FOR 1999 WATER YEAR WATER YEARS 1940 - 1999
ANNUAL TOTAL 18604.12 6281.48
ANNUAL MEAN 51.0 17.2 16.4
HIGHEST ANNUAL MEAN 56.4 1982
LOWEST ANNUAL MEAN .63 1977
HIGHEST DAILY MEAN 2000 Feb 3 600 Feb 7 2600 Oct 13
1962
LOWEST DAILY MEAN .34 Oct 21 .34 Oct 21 .00 Sep 19
1940
ANNUAL SEVEN-DAY MINIMUM .41 Oct 17 .41 Oct 17 .00 Oct 1
1946
INSTANTANEOUS PEAK FLOW 2690 Feb 7 8140 Feb 3
1998
INSTANTANEOUS PEAK STAGE 13.42 Feb 7 21.85 Feb 3
1998
ANNUAL RUNOFF (AC-FT) 36900 12460 11900
10 PERCENT EXCEEDS 133 38 34
50 PERCENT EXCEEDS 6.9 3.8 1.6
90 PERCENT EXCEEDS .69 .72 .00
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