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USGS Daily Statistics for California

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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 -> 2019-09-30)

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
1 197 238 271 172 50 12 3.8 1.4 0.86 0.62 3.7 105
2 177 225 245 174 39 12 3.6 1.3 0.75 0.64 3.3 151
3 144 205 232 147 41 11 3.5 1.4 0.73 0.68 3.1 181
4 300 253 283 181 36 12 3.5 1.3 0.72 0.69 3.1 155
5 320 241 235 143 36 11 3.3 1.2 0.73 0.92 3.5 111
6 206 289 238 141 32 11 3.2 1.2 0.74 0.77 6.9 98
7 216 307 197 120 29 10 3.1 1.1 0.72 0.81 7.3 106
8 307 341 167 100 28 9.7 3.0 1.1 0.78 0.80 5.9 78
9 317 320 243 91 30 9.4 2.9 1.1 0.76 0.83 9.3 88
10 275 243 227 102 26 9.0 2.8 1.1 0.72 1.8 24 101
11 244 191 228 125 24 8.6 2.7 1.1 0.69 2.1 31 124
12 271 269 191 119 22 8.5 2.5 1.1 0.64 21 32 86
13 343 344 244 100 22 7.9 2.4 1.1 0.65 34 31 74
14 387 363 207 98 21 7.5 2.3 1.0 0.64 13 30 131
15 283 320 189 88 21 7.2 2.2 1.0 0.63 5.0 24 213
16 424 355 209 82 20 6.9 2.1 1.0 0.68 3.5 51 176
17 327 507 173 73 19 6.7 2.0 1.0 0.74 2.7 60 111
18 277 346 154 68 31 6.4 2.0 1.0 0.97 2.1 51 128
19 250 302 171 61 31 6.2 1.9 0.99 0.77 2.0 34 254
20 362 323 184 56 24 5.8 2.0 0.98 0.66 1.8 39 204
21 522 259 185 55 22 5.4 1.9 1.0 0.61 1.8 56 260
22 325 283 215 50 19 5.3 1.9 1.0 0.59 1.9 34 394
23 309 227 180 48 18 5.1 1.8 1.0 0.62 4.0 39 330
24 323 256 197 48 16 4.9 1.7 0.98 1.0 6.7 53 268
25 292 248 184 46 16 4.8 1.7 0.94 1.2 5.6 29 237
26 333 289 179 43 16 4.7 1.6 0.92 1.2 4.4 23 221
27 281 374 173 50 17 4.4 1.6 0.88 0.75 2.7 33 303
28 204 322 161 46 18 4.4 1.4 0.89 0.71 3.9 67 261
29 245 235 168 46 15 4.4 1.4 0.90 0.69 3.7 58 276
30 239   253 46 14 4.2 1.3 0.91 0.65 5.1 78 215
31 269   203   13   1.3 0.89   4.1   302