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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 11087020 SAN GABRIEL R AB WHITTIER NARROWS DAM CA


Los Angeles County, California
Hydrologic Unit Code 18070106
Latitude  34°02'03", Longitude 118°02'14" NAD27
Drainage area 442  square miles
Gage datum 219.24 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 1955-10-01 -> 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
1 129 112 817 195 95 66 50 49 47 106 82 97
2 150 163 776 128 79 69 53 53 50 56 76 127
3 133 166 638 112 89 63 51 51 44 56 75 139
4 352 210 572 139 78 61 46 48 48 63 93 213
5 330 307 591 129 80 79 48 47 65 84 79 134
6 293 478 447 134 149 57 47 45 56 63 89 219
7 388 356 405 127 118 57 49 48 53 63 104 241
8 199 303 487 123 85 57 48 48 58 62 155 103
9 632 402 289 145 80 57 49 50 58 66 123 123
10 739 274 259 122 82 55 51 52 79 69 103 112
11 671 408 275 127 83 55 49 53 61 71 100 147
12 415 472 158 107 121 58 50 54 53 68 93 175
13 367 366 204 87 127 57 67 51 48 72 85 121
14 590 472 207 137 113 55 74 51 44 74 94 146
15 525 432 297 106 97 60 51 53 66 66 87 183
16 502 518 232 95 95 86 46 67 50 65 114 233
17 439 711 238 96 88 57 42 74 50 103 107 150
18 470 483 189 103 94 60 41 56 54 84 100 197
19 325 828 199 81 89 58 44 68 55 74 104 250
20 389 908 236 145 83 61 46 83 55 166 132 186
21 260 872 310 113 79 60 49 64 53 69 178 215
22 296 708 267 103 97 62 48 47 62 105 137 269
23 258 695 218 94 87 60 44 48 54 82 191 142
24 360 705 191 79 82 56 44 43 72 78 248 214
25 612 786 256 86 78 59 46 43 77 68 156 180
26 613 750 193 94 69 59 48 46 61 84 177 200
27 403 750 236 78 61 61 48 46 57 128 125 166
28 372 675 194 100 100 57 49 46 59 71 184 236
29 226 72 127 105 66 54 50 46 70 74 192 301
30 158   119 104 71 51 50 48 73 116 234 147
31 227   146   72   48 48   72   169