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USGS Daily Statistics for the Nation

The statistics generated from this site are based on approved daily-mean data and may not match those published by the USGS in official publications. The user is responsible for assessment and use of statistics from this site. For more details on why the statistics may not match, click here.

USGS 11162570 SAN GREGORIO C A SAN GREGORIO CA


San Mateo County, California
Hydrologic Unit Code 18050006
Latitude  37°19'33", Longitude 122°23'08" NAD27
Drainage area 50.9  square miles
Gage datum 13.50 feet above NAVD88
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00060, Discharge, cubic feet per second,
Day of
month		 Mean of daily mean values for each day for water year of record in, ft3/s   (Calculation Period 1969-10-01 -> 2025-09-30)

Calculation period restricted by USGS staff due to special conditions at/near site
Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
1 83 47 93 102 19 8.6 4.2 2.1 1.3 1.8 3.1 34
2 63 54 114 71 18 8.3 4.1 2 1.3 1.6 3.3 52
3 59 65 97 61 18 8 3.9 2 1.3 1.5 3 28
4 153 77 96 52 18 8.2 3.9 2 1.3 1.5 4.3 29
5 104 66 91 54 18 7.9 3.8 1.9 1.2 1.7 3.4 20
6 62 73 96 49 16 7.4 3.7 1.8 1.2 1.4 6.3 17
7 66 128 86 59 16 7.2 3.7 1.8 1.1 1.5 4.3 16
8 76 118 80 43 15 7 3.7 1.7 1.2 1.6 5.3 18
9 115 95 67 38 14 7.2 3.9 1.7 1.2 1.5 4.4 29
10 66 85 115 37 13 6.7 3.6 1.7 1.3 1.9 6.7 32
11 76 72 89 59 13 6.5 3.5 1.7 1.3 2.9 39 64
12 63 106 80 44 12 6.3 3.4 1.6 1.2 2.2 16 36
13 113 151 106 60 12 6.2 3.3 1.6 1.2 4.4 26 30
14 145 153 85 37 11 6.1 3.2 1.7 1.2 2.7 32 35
15 76 140 84 35 11 6 3 1.8 1.2 2.7 34 38
16 142 157 87 31 12 5.9 2.9 1.7 1.2 3.9 35 60
17 109 143 86 28 11 5.8 2.8 1.7 1.2 3.8 21 35
18 111 136 67 26 11 5.6 2.7 1.7 1.3 2.6 17 39
19 91 148 64 24 14 5.5 2.7 2.2 1.3 2.5 14 56
20 107 152 77 24 13 5.4 2.6 1.7 1.3 3 19 69
21 108 103 102 22 12 5.2 2.5 1.7 1.4 2.6 13 70
22 112 83 126 21 12 5.1 2.5 1.7 1.3 2.2 11 87
23 73 71 91 23 11 4.9 2.5 1.6 1.3 2.9 10 86
24 82 67 108 23 11 4.8 2.4 1.6 1.4 3.7 21 79
25 77 80 93 23 10 4.7 2.4 1.6 1.4 9.9 14 77
26 79 83 100 21 9.9 4.6 2.3 1.5 1.3 5.1 11 54
27 72 86 80 20 9.9 4.5 2.3 1.5 1.4 3.2 18 88
28 59 75 87 25 10 4.6 2.3 1.4 1.3 3.1 19 63
29 54 41 70 21 9.4 4.8 2.3 1.4 1.2 3 25 117
30 45   66 23 8.9 4.4 2.2 1.4 1.5 3.1 27 95
31 50   83   8.9   2.1 1.4   3   130