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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 11078000 SANTA ANA R A SANTA ANA CA


Orange County, California
Hydrologic Unit Code 18070203
Latitude  33°45'04", Longitude 117°54'27" NAD27
Drainage area 1,700  square miles
Gage datum 66.18 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 1939-10-01 -> 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
1 121 92 478 135 27 8.8 0.92 0.1 0.02 26 2.9 9.8
2 104 102 513 147 25 9.2 1.1 0.1 0.02 2.8 1.7 9.8
3 49 124 400 115 34 10 1.4 0.03 0.06 5 1.2 12
4 141 124 406 86 32 17 1.3 0.01 0.02 4.9 1.8 26
5 122 159 406 85 37 22 1.5 0.04 0.18 6.3 1.5 23
6 157 191 392 111 44 18 1.8 0.06 0.1 13 1.3 64
7 210 225 306 93 46 17 1.7 0.03 0.07 2.2 3.6 64
8 207 237 289 74 41 15 1.6 0.02 0.1 3.6 14 31
9 248 333 215 64 41 14 1.4 0.02 0.02 3.7 9.6 18
10 296 291 214 63 41 14 1.2 0.02 4.3 3.6 3.8 15
11 382 195 245 70 32 12 1.1 0.03 1.7 3.2 13 18
12 362 231 214 67 22 11 1 0.22 0.03 3 11 25
13 212 318 180 58 61 7.1 1 0.01 0.02 3.7 38 16
14 276 387 152 68 40 1.3 0.98 0.01 0.06 1.1 12 14
15 271 298 260 73 21 0.45 1.1 0.05 1.9 0.11 3.4 30
16 324 277 265 55 12 1.5 0.69 0.03 0.03 0.03 3.6 56
17 288 283 202 64 11 2.3 0.16 6 0.03 12 2.1 54
18 243 223 93 57 12 0.53 0.05 6.8 0.02 2.6 13 58
19 181 209 74 33 9.5 0.41 0.37 8.2 0.45 5.6 5.7 71
20 172 290 77 37 7.4 0.33 0.18 9.9 0.12 37 8.5 121
21 221 406 113 33 5.2 0.29 0.06 8.2 0.35 22 25 123
22 257 448 143 41 12 0.29 0.01 5.4 1.1 20 16 156
23 254 432 171 40 5.5 0.31 0.24 0.16 0.17 22 3.7 66
24 237 450 121 37 4.9 0.27 0.08 0.06 0.78 19 27 88
25 287 541 95 29 4.7 0.22 0.16 0.05 10 19 16 80
26 316 570 95 17 5 0.26 0.26 0.06 0.31 7.6 21 69
27 214 462 143 17 6 0.6 0.33 0.08 0.32 39 12 41
28 129 406 169 36 11 0.69 0.34 0.08 2.6 19 16 57
29 172 177 135 27 15 0.67 0.22 0.05 2.6 19 31 85
30 148   105 24 10 0.7 0.17 0.02 6.8 19 24 149
31 125   98   9.8   0.14 0.02   5   132