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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
1 127 110 805 193 93 65 50 49 47 106 82 97
2 149 161 765 126 78 68 53 53 50 56 76 127
3 132 164 628 111 88 63 51 51 44 56 75 139
4 347 208 564 137 77 61 46 48 48 63 93 213
5 326 304 585 127 79 79 48 47 65 84 79 133
6 289 474 444 133 147 57 47 45 56 63 89 216
7 383 364 400 125 116 57 49 48 53 63 104 239
8 197 300 480 122 84 57 48 48 58 62 155 103
9 623 398 285 144 79 57 49 50 58 66 123 122
10 729 274 256 121 81 55 51 52 79 69 103 112
11 662 403 272 126 82 55 49 53 61 71 100 145
12 410 466 157 106 119 58 50 54 53 68 93 173
13 362 425 211 87 126 57 67 51 48 72 85 119
14 581 470 204 136 112 55 74 51 44 74 94 144
15 517 427 293 105 96 60 51 53 66 66 87 181
16 494 511 229 94 94 86 46 67 50 65 114 229
17 432 701 234 95 87 57 42 74 50 103 107 147
18 462 477 186 102 92 60 41 56 54 84 100 194
19 320 818 198 80 88 58 44 68 55 74 104 246
20 383 896 234 143 82 61 46 83 55 166 132 184
21 256 859 306 112 78 60 49 64 53 69 178 212
22 292 698 263 102 96 62 48 47 62 105 137 265
23 255 685 215 93 86 60 44 48 54 82 191 140
24 355 695 189 79 81 56 44 43 72 78 248 211
25 603 774 253 85 76 59 46 43 77 68 156 177
26 606 740 190 93 68 59 48 46 61 84 177 197
27 398 739 232 77 60 61 48 46 57 128 125 163
28 366 665 191 99 99 57 49 46 59 71 184 233
29 223 72 126 103 65 54 50 46 70 74 192 296
30 156   117 102 70 51 50 48 73 116 234 145
31 224   144   71   48 48   72   167