11022480 SAN DIEGO RIVER AT MAST ROAD, NEAR SANTEE, CA
LOCATION.--Lat 32°50'25", long 117°01'30", in Mission San Diego Grant, San Diego County, Hydrologic Unit
18070304, near right bank at Mast Road Bridge, 0.7 mi upstream from Old Mission Damsite, 2.8 mi west of
Santee, and 14.2 mi downstream from El Capitan Lake.
DRAINAGE AREA.--368 mi2.
PERIOD OF RECORD.--May 1912 to December 1915, April 1916 to current year. Monthly discharge only for some
periods and yearly estimates only for 1924-25, published in WSP-1315-B. Prior to September 1981 published as
"near Santee" (station 11022500).
REVISED RECORDS.--WSP 1565: 1955-56. WSP 1635: 1922, 1926(M), 1927. WSP 1928: Drainage area.
GAGE.--Water-stage recorder. Elevation of gage is 300 ft above sea level, from topographic map. Prior to
Nov. 10, 1920, nonrecording gage at site 0.7 mi downstream at different datum. Nov. 10, 1920, to Jan. 19,
1982, at site 2.6 mi downstream at different datum.
REMARKS.--Records good. Flow regulated by Cuyamaca Reservoir, capacity, 11,740 acre-ft, El Capitan Lake (station
11020600), and San Vicente Reservoir (station 11022100). Diversions by city of San Diego for municipal supply
and by Helix Irrigation District.
EXTREMES FOR PERIOD OF RECORD.--Maximum discharge, 45,400 ft3/s, Feb. 16, 1927, gage height, 18.1 ft, site and
datum then in use, from floodmarks, on basis of slope-area measurement of peak flow; no flow for many days
some years.
EXTREMES OUTSIDE PERIOD OF RECORD.--Maximum discharge, 70,200 ft3/s, Jan. 27, 1916, gage height, 25.1 ft, site
and datum in use prior to Nov. 10, 1920, from floodmarks, based on slope-conveyance computation of peak flow.
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 2.5 18 6.4 5.2 193 17 12 3.2 3.2 1.4 .95 1.3
2 2.4 8.8 6.5 4.8 30 15 13 3.2 2.9 1.3 .93 1.3
3 2.4 6.3 6.7 4.3 24 14 11 3.3 2.8 1.3 .92 1.2
4 2.5 6.1 6.6 4.0 23 13 10 3.2 2.6 1.4 .90 1.2
5 2.7 5.7 6.4 4.3 21 87 8.8 3.1 2.6 1.4 .97 1.2
6 2.5 5.8 6.4 4.9 19 19 8.2 3.0 2.3 1.5 .96 1.2
7 2.5 5.0 6.4 4.9 18 18 8.2 3.0 2.0 1.4 1.0 1.1
8 2.5 4.4 6.5 5.2 23 17 7.9 2.7 1.9 1.4 1.0 1.1
9 2.5 5.4 5.9 5.3 14 15 7.6 2.6 1.8 1.4 1.0 1.0
10 2.9 4.9 5.1 4.7 11 13 8.2 2.4 1.7 3.5 1.0 .97
11 3.2 5.0 5.0 4.6 16 12 8.2 2.3 1.7 5.0 .94 .94
12 3.0 5.3 5.0 4.4 21 47 8.0 2.4 1.6 2.2 .84 .88
13 3.3 5.7 6.0 4.7 16 361 7.5 2.2 1.6 1.8 .83 .91
14 3.0 6.1 6.8 5.0 13 111 7.3 2.3 1.5 1.8 .83 1.0
15 2.5 5.9 6.2 4.9 12 46 7.2 2.2 1.4 1.8 .75 1.0
16 3.0 6.1 6.0 7.7 11 35 7.0 2.4 1.4 1.8 .77 .93
17 4.0 6.1 5.6 29 11 30 11 3.3 1.3 1.8 .81 .91
18 3.8 6.2 5.7 6.5 10 26 49 5.1 1.5 1.7 .80 .90
19 3.2 6.5 5.0 6.3 10 22 11 4.6 1.7 1.6 .83 1.0
20 3.1 6.9 15 5.8 9.5 19 9.4 4.0 1.8 2.2 .86 .93
21 3.0 7.0 6.8 55 17 18 8.6 3.4 1.7 1.6 .94 .88
22 2.9 6.5 4.9 95 19 16 7.7 3.2 1.7 1.3 .89 .88
23 3.0 5.5 42 18 11 15 6.7 3.0 1.7 1.4 .88 .87
24 2.8 5.9 9.6 13 11 14 7.6 4.8 1.6 1.0 .88 .87
25 2.6 5.6 6.9 17 122 14 5.7 5.0 1.7 .91 .86 .91
26 2.7 6.0 6.5 14 54 14 5.6 4.0 1.8 1.1 .96 1.8
27 3.1 6.3 6.0 10 22 14 5.4 3.8 1.8 1.2 1.1 2.1
28 3.2 6.0 5.8 14 55 14 4.5 3.4 1.7 1.0 1.0 1.4
29 3.0 6.0 5.6 10 20 14 3.8 3.1 1.7 .85 1.0 1.2
30 3.2 6.2 5.5 15 --- 14 3.5 3.4 1.6 .84 1.0 1.1
31 2.9 --- 5.4 133 --- 12 --- 3.6 --- 1.0 1.1 ---
TOTAL 89.9 191.2 234.2 520.5 836.5 1096 279.6 101.2 56.3 49.90 28.50 32.98
MEAN 2.90 6.37 7.55 16.8 28.8 35.4 9.32 3.26 1.88 1.61 .92 1.10
MAX 4.0 18 42 133 193 361 49 5.1 3.2 5.0 1.1 2.1
MIN 2.4 4.4 4.9 4.0 9.5 12 3.5 2.2 1.3 .84 .75 .87
AC-FT 178 379 465 1030 1660 2170 555 201 112 99 57 65
11022480 SAN DIEGO RIVER AT MAST ROAD, NEAR SANTEE, CA--Continued
STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1912 - 1996, BY WATER YEAR (WY)
OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP
MEAN 2.06 5.55 21.2 32.5 92.6 82.9 49.0 18.3 4.83 3.04 2.75 1.81
MAX 20.8 78.8 728 410 1871 683 1324 379 181 156 139 38.3
(WY) 1988 1986 1922 1993 1927 1941 1941 1915 1980 1980 1980 1980
MIN .000 .000 .000 .000 .000 .019 .000 .000 .000 .000 .000 .000
(WY) 1913 1913 1913 1951 1951 1951 1951 1913 1913 1912 1913 1913
SUMMARY STATISTICS FOR 1995 CALENDAR YEAR FOR 1996 WATER YEAR WATER YEARS 1912 - 1996
ANNUAL TOTAL 18112.3 3516.78
ANNUAL MEAN 49.6 9.61 25.9
HIGHEST ANNUAL MEAN 219 1922
LOWEST ANNUAL MEAN .002 1951
HIGHEST DAILY MEAN 1470 Mar 5 361 Mar 13 27300 Feb 16 1927
LOWEST DAILY MEAN 2.4 Oct 2 .75 Aug 15 .00 Jun 19 1912
ANNUAL SEVEN-DAY MINIMUM 2.5 Oct 1 .80 Aug 13 .00 Jun 19 1912
INSTANTANEOUS PEAK FLOW 1070 Feb 1 45400 Feb 16 1927
INSTANTANEOUS PEAK STAGE 8.58 Feb 1 18.10 Feb 16 1927
ANNUAL RUNOFF (AC-FT) 35930 6980 18800
10 PERCENT EXCEEDS 91 17 28
50 PERCENT EXCEEDS 9.6 4.3 1.4
90 PERCENT EXCEEDS 2.9 .97 .00
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