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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 11456000 NAPA R NR ST HELENA CA


Napa County, California
Hydrologic Unit Code 18050002
Latitude  38°30'41", Longitude 122°27'17" NAD27
Drainage area 78.8  square miles
Gage datum 191.37 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 1929-10-01 -> 2024-09-30)

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
1 198 228 263 167 48 12 3.8 1.3 0.81 0.58 3.7 101
2 175 217 237 169 38 12 3.5 1.2 0.7 0.6 3.4 145
3 144 197 224 143 40 11 3.4 1.3 0.69 0.64 3.2 173
4 301 243 273 175 35 11 3.4 1.2 0.68 0.65 3.2 147
5 341 231 228 139 35 11 3.2 1.2 0.69 0.86 3.5 106
6 210 277 231 136 31 10 3.1 1.1 0.69 0.73 6.7 94
7 215 293 192 116 28 9.9 3 1.1 0.68 0.76 7 105
8 312 326 164 97 27 9.4 3 1 0.73 0.75 5.7 77
9 345 306 244 89 29 9.2 2.8 1.1 0.71 0.78 12 85
10 283 233 258 98 26 8.7 2.7 1 0.67 1.7 25 99
11 254 183 229 121 23 8.4 2.6 1.1 0.65 2 30 120
12 277 257 198 114 22 8.3 2.4 1.1 0.6 20 31 86
13 343 329 250 96 22 7.7 2.3 1 0.61 32 30 81
14 404 347 232 95 20 7.3 2.2 0.96 0.6 12 29 134
15 290 306 196 85 20 7.1 2.1 0.97 0.59 4.7 23 209
16 418 338 208 80 20 6.8 2.1 0.95 0.64 3.3 48 183
17 322 483 171 71 19 6.5 2 0.98 0.69 2.5 57 111
18 270 330 152 66 30 6.2 2 0.96 0.91 1.9 49 125
19 244 289 168 59 30 6 1.9 0.93 0.72 1.8 32 245
20 349 308 180 54 23 5.7 1.9 0.93 0.62 1.7 37 197
21 501 247 189 54 21 5.3 1.8 0.94 0.57 1.7 53 250
22 315 270 223 49 18 5.2 1.8 0.97 0.56 1.8 33 378
23 298 217 179 47 17 5 1.7 0.95 0.58 3.7 37 335
24 311 245 193 46 16 4.7 1.6 0.92 0.95 54 50 267
25 280 237 180 45 16 4.7 1.6 0.88 1.2 24 28 237
26 320 277 174 42 15 4.6 1.6 0.87 1.1 8 22 219
27 271 360 168 48 17 4.3 1.5 0.83 0.7 4.4 31 307
28 198 314 161 45 18 4.3 1.4 0.84 0.66 4.6 64 257
29 236 224 168 45 14 4.3 1.3 0.85 0.65 4 55 271
30 230   247 44 13 4.1 1.3 0.86 0.61 5.1 75 221
31 258   198   13   1.2 0.84   4.1   306