11303000 STANISLAUS RIVER AT RIPON, CA
LOCATION.-Lat 37°43'47", long 121°06'34", in NW 1/4 SE 1/4 sec.29, T.2 S., R.8 E., Stanislaus County,
Hydrologic Unit 18040002, on left bank 15 ft downstream from railroad bridge, 1.1 mi southeast of Ripon, and 15
mi upstream from mouth.
DRAINAGE AREA.-1,075 mi2.
WATER-DISCHARGE RECORDS
PERIOD OF RECORD.-October 1940 to current year. April to September 1940 in reports of California Department of
Water Resources.
GAGE.-Water-stage recorder. Datum of gage is 0.72 ft above sea level. October 1940 to Nov. 17, 1953, at site 100
ft upstream at same datum.
REMARKS.-Records good. Flow regulated by reservoirs and powerplants upstream from station. South San Joaquin and
Oakdale Canals (stations 11300500 and 11301000) divert at Goodwin Dam 34 mi upstream for irrigation in the
vicinity of Oakdale. See REMARKS for Stanislaus River below Goodwin Dam, near Knights Ferry (station 11302000).
EXTREMES FOR PERIOD OF RECORD.-Maximum discharge, 62,500 ft3/s, Dec. 24, 1955, gage height, 63.25 ft;
minimum daily, 0.11 ft3/s, Aug. 4-6, 1977.
EXTREMES OUTSIDE PERIOD OF RECORD.-Flood of Feb. 12, 1938, reached a stage of 64.4 ft, from floodmarks.
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 1900 1090 948 1170 2380 3910 1350 1560 1210 868 676 632
2 1930 1040 933 1170 2050 3610 1330 1550 1320 853 696 573
3 1940 1080 956 1160 2110 3120 1330 1640 1380 869 685 531
4 1920 1050 968 1160 2320 3050 1370 1580 1390 883 674 537
5 1960 979 953 1160 2450 3000 1360 1540 1360 926 659 557
6 1980 1010 958 1160 2740 2810 1380 1540 1370 887 683 581
7 1950 1020 951 1130 2830 2380 1340 1560 1390 796 676 548
8 1970 1020 951 880 3070 2080 1340 1520 1440 738 666 523
9 2010 1010 939 827 3350 2040 1330 1550 1490 703 640 537
10 1970 974 915 816 3580 2070 1300 1580 1470 735 639 531
11 1960 978 914 812 3520 2050 1310 1540 1500 746 626 535
12 1950 944 934 807 3830 2010 1310 1530 1500 754 600 556
13 1970 915 921 801 4110 2000 1300 1530 1540 695 593 550
14 1890 895 919 800 4180 1980 1300 1550 1560 696 618 521
15 1920 886 904 808 4190 1940 1380 1560 1490 694 628 542
16 1970 885 897 987 4110 1940 1520 1590 1510 684 633 529
17 1950 896 890 1220 3750 1920 1520 1580 1510 689 626 538
18 1950 938 895 1270 3750 1950 1520 1570 1490 691 668 530
19 1940 940 893 1400 4070 1930 1550 1580 1490 703 627 554
20 1970 933 883 1800 4040 1940 1530 1560 1500 726 598 586
21 1920 933 878 2200 4200 1760 1520 1540 1530 745 591 536
22 1980 937 888 2520 4250 1550 1500 1570 1520 693 617 537
23 1980 941 882 2840 4160 1500 1540 1560 1520 668 640 554
24 2010 939 866 3040 4260 1470 1560 1560 1340 698 609 536
25 2140 929 1010 3020 4260 1440 1540 1510 1120 697 623 521
26 2070 923 1120 3000 4210 1420 1560 1520 1060 709 601 561
27 2030 930 1130 3260 4200 1400 1500 1540 1060 684 608 576
28 1990 958 1140 3530 4150 1380 1200 1570 1060 674 595 549
29 1940 948 1160 3480 --- 1370 1500 1370 991 691 624 572
30 1970 940 1170 3150 --- 1350 1570 1230 916 667 640 574
31 1460 --- 1170 2700 --- 1370 --- 1220 --- 674 611 ---
TOTAL 60490 28861 29936 54078 100120 63740 42660 47400 41027 22936 19670 16507
MEAN 1951 962 966 1744 3576 2056 1422 1529 1368 740 635 550
MAX 2140 1090 1170 3530 4260 3910 1570 1640 1560 926 696 632
MIN 1460 885 866 800 2050 1350 1200 1220 916 667 591 521
AC-FT 120000 57250 59380 107300 198600 126400 84620 94020 81380 45490 39020 32740
STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1941 - 1999, BY WATER YEAR (WY)
MEAN 396 476 910 1245 1308 1431 1529 2038 1443 522 375 357
MAX 1951 4518 7602 6273 6499 5094 5047 7703 5531 3633 2834 2041
(WY) 1999 1951 1951 1997 1997 1943 1983 1952 1967 1983 1983 1983
MIN 6.34 20.3 26.0 77.8 64.3 47.5 41.0 42.8 25.1 9.88 .63 2.95
(WY) 1978 1978 1978 1977 1977 1977 1977 1977 1977 1977 1977 1977
SUMMARY STATISTICS FOR 1998 CALENDAR YEAR FOR 1999 WATER YEAR WATER YEARS 1941 - 1999
ANNUAL TOTAL 692682 527425
ANNUAL MEAN 1898 1445 1001
HIGHEST ANNUAL MEAN 2548 1983
LOWEST ANNUAL MEAN 44.9 1977
HIGHEST DAILY MEAN 5120 Feb 9 4260 Feb 24 47000 Dec 24
1955
LOWEST DAILY MEAN 385 Jan 1 521 Sep 14 .11 Aug 4
1977
ANNUAL SEVEN-DAY MINIMUM 439 Jan 1 536 Sep 8 .13 Aug 2
1977
INSTANTANEOUS PEAK FLOW 4300 Feb 24 62500 Dec 24
1955
INSTANTANEOUS PEAK STAGE 51.60 Feb 24 63.25 Dec 24
1955
ANNUAL RUNOFF (AC-FT) 1374000 1046000 725000
10 PERCENT EXCEEDS 2600 2770 2660
50 PERCENT EXCEEDS 1840 1300 402
90 PERCENT EXCEEDS 932 609 139
11303000 STANISLAUS RIVER AT RIPON, CA-Continued
WATER-QUALITY RECORDS
PERIOD OF RECORD.-Water year 1985-88, 1993 to current year. Data for the period October 1985 to March 1987 are
available in U.S. Geological Survey Open-File Report 88-479. Data for the period April 1987 to September 1988 are
available in U.S. Geological Survey Open-File Report 91-74.
CHEMICAL DATA: Water year 1985-88, 1994.
SPECIFIC CONDUCTANCE: Water years 1986-89. July 1997 to current year.
WATER TEMPERATURE: Water years 1986-89. October 1994 to current year.
SEDIMENT DATA: Water year 1985-88, 1994.
PERIOD OF DAILY RECORD.-Water years 1986-89. October 1994 to current year.
SPECIFIC CONDUCTANCE: Water years 1986-89. July 1997 to current year.
WATER TEMPERATURE: Water years 1986-89. October 1994 to current year.
INSTRUMENTATION.-Water-temperature recorder from October 1994 to June 1997, water-quality monitor since July
1997.
REMARKS.-Specific conductance and water temperature may be affected by upstream regulation.
EXTREMES FOR PERIOD OF DAILY RECORD.-
SPECIFIC CONDUCTANCE: Maximum recorded, 226 microsiemens, Feb. 26, 1988; minimum recorded, 38 microsiemens,
Mar. 2, 1989.
WATER TEMPERATURE: Maximum recorded, 27.5C, July 21, 1989; minimum recorded, 2.5C, Dec. 11, 22, 1997.
EXTREMES FOR CURRENT YEAR.-
SPECIFIC CONDUCTANCE: Maximum recorded, 124 microsiemens, Nov. 16; minimum recorded, 64 microsiemens, Oct. 1.
WATER TEMPERATURE: Maximum recorded, 21.5C, July 12-14; minimum recorded, 6.5C, Dec. 23-25.
SPECIFIC CONDUCTANCE (MICROSIEMENS/CM AT 25 DEG. C), WATER YEAR OCTOBER 1998 TO SEPTEMBER 1999
DAY MAX MIN MAX MIN MAX MIN MAX MIN MAX MIN MAX MIN
OCTOBER NOVEMBER DECEMBER JANUARY FEBRUARY MARCH
1 67 64 119 108 115 101 95 88 113 98 93 88
2 66 65 117 106 115 102 97 89 114 102 92 86
3 68 66 118 100 111 100 97 88 109 97 90 79
4 67 66 110 99 108 99 98 89 107 98 79 75
5 69 67 118 101 113 100 98 88 108 100 76 72
6 70 68 115 99 101 98 97 89 104 98 80 72
7 71 69 109 99 111 98 97 89 102 99 89 76
8 71 69 114 102 107 98 111 94 108 100 84 79
9 71 68 111 100 111 98 114 100 108 105 94 77
10 71 69 113 101 111 99 114 99 111 107 87 75
11 71 69 110 98 112 98 111 99 110 99 81 74
12 72 69 111 100 110 95 112 100 105 99 83 74
13 73 70 119 102 108 98 112 99 106 101 79 77
14 72 70 118 102 108 97 112 99 108 104 79 77
15 72 70 123 102 112 98 113 99 108 103 82 77
16 73 71 124 102 107 99 110 86 107 102 96 78
17 73 72 112 100 112 99 91 86 107 101 81 78
18 73 71 110 98 114 100 91 86 105 100 84 77
19 74 71 112 100 111 99 102 87 104 98 85 77
20 74 71 115 99 111 100 105 97 105 98 84 77
21 73 72 102 100 113 99 102 91 105 97 84 77
22 72 71 117 100 113 100 92 87 108 103 94 82
23 80 71 112 101 111 99 89 86 107 103 90 83
24 74 72 114 100 112 100 94 87 106 102 91 83
25 79 73 112 100 112 89 95 91 104 102 90 84
26 79 74 114 100 95 88 95 90 105 102 89 82
27 83 73 118 101 96 88 95 91 103 96 88 82
28 81 73 109 100 100 89 96 92 96 92 95 83
29 78 73 115 104 99 89 96 93 --- --- 95 82
30 80 74 118 103 97 89 100 94 --- --- 96 84
31 111 80 --- --- 97 89 102 95 --- --- 92 82
MONTH 111 64 124 98 115 88 114 86 114 92 96 72
SPECIFIC CONDUCTANCE (MICROSIEMENS/CM AT 25 DEG. C), WATER YEAR OCTOBER 1998 TO SEPTEMBER 1999
DAY MAX MIN MAX MIN MAX MIN MAX MIN MAX MIN MAX MIN
APRIL MAY JUNE JULY AUGUST SEPTEMBER
1 95 85 78 76 79 74 83 80 86 82 92 86
2 92 85 78 76 77 68 82 80 84 79 103 89
3 91 84 76 74 70 68 80 77 84 81 104 99
4 85 83 77 74 71 68 79 75 86 80 101 94
5 94 83 77 74 72 70 77 74 85 82 97 92
6 95 82 76 74 72 70 77 75 87 78 97 92
7 86 83 76 73 70 69 93 76 89 84 101 92
8 85 83 76 73 71 65 98 88 89 81 102 93
9 85 82 74 72 67 65 93 89 89 81 100 91
10 85 82 74 72 69 66 94 83 87 83 98 92
11 86 82 74 72 69 65 88 81 89 82 98 90
12 84 82 74 72 72 66 88 80 88 83 94 90
13 85 83 73 71 68 65 92 87 95 85 97 94
14 87 84 74 71 67 65 92 86 94 86 98 96
15 86 79 72 70 67 66 91 81 91 86 97 91
16 83 79 72 68 67 66 90 86 91 86 96 94
17 83 81 72 69 68 66 87 84 92 86 97 90
18 83 80 71 69 68 66 89 84 89 79 98 91
19 82 80 71 68 68 66 86 81 93 83 99 95
20 83 80 71 68 67 66 85 79 95 88 98 91
21 82 79 71 68 69 66 81 78 97 90 104 94
22 83 79 72 68 68 66 85 80 96 90 105 100
23 81 78 70 68 68 66 87 81 92 84 105 98
24 83 80 70 67 74 68 85 80 92 86 104 102
25 81 79 70 68 81 73 86 80 98 85 106 103
26 80 77 71 68 80 77 89 80 90 86 106 102
27 82 78 70 67 79 75 84 80 91 88 103 101
28 117 76 70 68 76 75 83 81 94 88 103 97
29 76 72 83 68 83 75 84 80 94 85 101 99
30 78 75 83 76 83 81 86 81 91 83 102 99
31 --- --- 79 75 --- --- 86 80 91 88 --- ---
MONTH 117 72 83 67 83 65 98 74 98 78 106 86
TEMPERATURE, WATER (DEG. C), WATER YEAR OCTOBER 1998 TO SEPTEMBER 1999
DAY MAX MIN MAX MIN MAX MIN MAX MIN MAX MIN MAX MIN
OCTOBER NOVEMBER DECEMBER JANUARY FEBRUARY MARCH
1 15.0 14.0 14.0 13.0 12.5 11.5 9.0 8.5 10.0 9.5 11.5 10.5
2 14.5 14.0 13.5 12.5 12.0 11.5 9.0 8.5 10.0 9.0 11.5 11.0
3 14.0 13.5 13.5 12.5 12.0 11.5 8.5 8.5 10.0 9.5 12.0 11.0
4 14.0 13.5 13.5 12.5 11.5 10.5 8.5 8.5 10.0 10.0 11.0 10.5
5 14.0 13.0 13.5 12.5 10.5 9.5 8.5 8.0 10.0 9.5 11.0 10.5
6 14.0 13.5 13.0 12.0 10.0 9.5 8.0 8.0 10.0 10.0 11.0 10.5
7 14.0 13.5 13.0 12.5 9.5 9.0 8.0 8.0 10.5 10.0 11.0 10.0
8 14.5 13.5 12.5 12.0 10.0 9.5 9.0 8.0 10.5 10.0 11.0 10.5
9 14.5 13.5 12.5 12.0 10.0 9.0 8.5 8.0 11.0 10.5 11.0 10.0
10 14.0 13.0 12.0 11.5 9.5 9.0 8.5 8.0 10.5 9.5 11.0 10.0
11 13.5 12.5 12.0 11.5 9.5 9.0 8.5 8.0 10.0 9.5 11.0 10.5
12 13.5 12.5 12.0 11.5 9.5 9.0 8.5 8.0 10.0 9.5 11.5 10.5
13 13.5 12.5 12.0 11.5 9.5 9.0 --- --- 10.0 9.5 11.5 10.5
14 13.5 12.5 11.5 11.5 10.0 9.5 --- --- 10.5 10.0 11.0 10.5
15 13.5 12.5 12.0 11.0 9.5 9.0 --- --- 10.5 10.0 11.0 10.5
16 12.5 12.0 12.0 12.0 9.5 9.0 --- --- 10.5 10.0 11.0 10.5
17 13.0 12.0 12.5 12.0 10.0 9.5 11.0 10.5 10.5 10.0 11.5 10.5
18 13.0 12.0 12.5 11.5 10.0 9.5 11.0 10.5 10.5 10.0 11.5 11.0
19 13.0 12.0 12.0 11.0 10.0 9.0 11.0 10.5 10.5 10.0 11.5 11.0
20 13.0 12.0 11.5 11.0 9.0 8.0 11.0 11.0 10.0 10.0 11.5 11.0
21 13.0 12.0 11.5 11.0 8.0 7.0 11.0 10.0 10.5 9.5 12.0 11.0
22 13.0 12.5 12.5 11.5 7.5 7.0 10.5 10.0 10.5 10.0 12.0 11.0
23 13.0 12.5 12.5 12.0 7.0 6.5 10.5 10.5 11.0 10.0 12.0 11.5
24 13.0 12.5 12.5 12.0 7.0 6.5 10.5 10.0 11.0 10.0 12.0 11.0
25 12.5 12.0 12.0 11.5 7.5 6.5 10.5 10.0 11.0 10.5 13.0 11.5
26 13.0 12.0 12.0 11.0 7.5 7.0 10.0 10.0 10.5 10.0 13.5 12.0
27 13.0 12.0 12.0 11.5 8.0 7.0 10.0 9.5 11.0 10.0 13.0 11.5
28 12.5 12.0 12.0 11.5 8.0 7.5 10.0 9.5 11.0 10.5 12.5 11.0
29 12.5 12.0 12.0 11.5 8.0 7.5 10.0 9.5 --- --- 12.0 11.0
30 13.0 12.0 12.0 11.5 8.5 7.5 10.0 9.5 --- --- 12.0 11.0
31 13.5 12.0 --- --- 9.0 8.5 10.0 9.5 --- --- 12.5 11.5
MONTH 15.0 12.0 14.0 11.0 12.5 6.5 --- --- 11.0 9.0 13.5 10.0
DAY MAX MIN MAX MIN MAX MIN MAX MIN MAX MIN MAX MIN
APRIL MAY JUNE JULY AUGUST SEPTEMBER
1 12.5 11.0 14.5 13.5 16.0 15.0 20.0 18.0 19.5 17.5 18.5 17.0
2 12.5 11.0 13.5 12.5 15.5 14.0 19.5 18.0 20.0 18.0 18.5 16.5
3 12.0 11.0 13.0 11.5 14.0 13.5 18.5 17.0 20.5 18.5 19.0 17.0
4 11.5 10.0 13.0 11.5 14.0 13.0 18.0 16.0 20.5 18.5 19.0 17.5
5 11.5 10.5 13.5 12.0 15.5 13.5 18.5 16.5 20.0 18.5 19.5 18.0
6 11.0 10.0 14.5 13.0 16.0 14.5 18.5 16.5 19.5 18.0 20.0 18.5
7 11.0 10.5 14.5 13.0 15.5 14.0 19.0 17.0 19.5 17.5 20.0 18.5
8 10.5 10.0 14.0 12.5 15.0 14.0 20.0 18.0 20.0 18.0 20.0 18.5
9 11.0 9.5 14.0 12.5 15.5 14.0 20.0 18.0 19.5 18.0 20.0 18.5
10 11.0 10.0 14.0 12.5 15.5 14.0 20.5 18.5 19.0 18.0 19.5 18.0
11 11.0 10.5 14.5 13.0 16.0 14.5 20.5 19.0 20.0 17.5 19.5 18.0
12 12.0 10.0 15.0 13.5 16.0 14.5 21.5 19.5 20.0 18.0 20.0 18.0
13 13.0 11.5 14.5 13.5 16.5 15.0 21.5 20.0 20.0 18.0 19.5 18.0
14 13.5 12.0 14.5 13.0 16.5 15.5 21.5 20.0 20.0 18.0 19.5 18.0
15 13.5 12.5 14.5 13.0 16.5 15.0 21.0 19.0 20.0 17.5 19.5 18.0
16 14.0 13.0 14.5 13.0 16.5 14.5 20.0 18.5 20.0 18.0 19.0 18.0
17 14.5 13.0 14.5 13.5 16.5 15.0 20.0 18.0 20.5 18.5 19.0 17.5
18 14.5 13.5 15.0 13.5 16.5 15.0 20.0 18.0 20.0 18.5 19.0 17.5
19 14.5 13.0 15.0 13.5 16.5 15.0 20.0 18.0 20.0 18.0 18.5 17.5
20 14.0 13.0 14.5 13.5 16.5 15.0 19.5 18.0 20.0 18.0 19.0 17.0
21 14.0 13.0 14.5 13.0 17.0 15.5 19.5 17.5 20.0 18.5 19.0 17.0
22 14.0 12.5 15.5 14.0 17.0 15.5 20.0 18.0 20.5 19.0 19.5 18.0
23 14.0 12.5 15.5 14.5 17.5 16.0 20.0 18.0 21.0 19.0 20.0 18.5
24 14.5 13.5 15.5 14.5 17.5 16.0 19.5 17.5 21.0 19.0 19.5 18.5
25 14.5 13.5 16.0 14.0 18.0 16.0 19.5 17.5 21.0 19.5 19.5 17.5
26 14.0 13.5 16.0 14.5 18.0 16.0 20.0 18.5 20.5 18.5 19.5 18.0
27 13.5 12.5 16.5 15.0 18.0 16.0 20.0 18.0 19.5 18.0 19.0 17.5
28 14.0 12.5 16.5 15.0 18.5 16.5 19.5 18.0 20.5 18.0 18.0 16.5
29 13.0 11.5 16.5 14.5 19.0 17.0 20.0 18.0 21.0 19.0 18.0 17.0
30 14.5 13.0 16.5 14.5 19.5 17.5 19.5 17.5 20.0 18.5 18.5 17.0
31 --- --- 16.5 15.0 --- --- 19.5 17.5 19.0 17.5 --- ---
MONTH 14.5 9.5 16.5 11.5 19.5 13.0 21.5 16.0 21.0 17.5 20.0 16.5
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