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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 191.33 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 -> 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
1 199 239 262 168 48 12 3.7 1.3 0.8 0.57 3.6 99
2 176 235 240 169 38 12 3.5 1.2 0.69 0.6 3.4 142
3 146 211 226 143 40 11 3.4 1.3 0.68 0.63 3.1 169
4 298 327 272 174 36 11 3.4 1.2 0.67 0.64 3.1 145
5 336 277 229 139 35 11 3.2 1.2 0.68 0.85 3.4 104
6 208 297 232 136 31 10 3.1 1.1 0.69 0.72 6.6 93
7 212 312 192 116 28 9.8 3 1.1 0.67 0.76 6.9 104
8 307 333 164 97 27 9.4 3 0.99 0.72 0.74 5.6 76
9 339 309 242 89 29 9.1 2.8 1 0.71 0.77 12 83
10 278 235 256 98 26 8.6 2.7 1 0.66 1.6 25 97
11 249 186 226 120 23 8.4 2.6 1.1 0.64 2 30 118
12 272 257 197 113 22 8.2 2.4 1.1 0.6 19 31 85
13 338 353 247 96 22 7.7 2.3 1 0.6 31 29 81
14 401 358 230 94 20 7.3 2.2 0.95 0.59 12 28 157
15 286 309 195 84 20 7.1 2.1 0.96 0.58 4.6 23 213
16 411 338 207 79 20 6.7 2.1 0.94 0.63 3.3 48 188
17 317 481 175 70 19 6.5 2 0.97 0.69 2.5 56 116
18 266 340 153 65 30 6.2 2 0.94 0.9 1.9 48 128
19 241 315 168 59 30 6 1.9 0.92 0.71 1.8 32 244
20 345 326 179 54 23 5.7 1.9 0.91 0.62 1.6 40 197
21 498 254 188 53 21 5.3 1.8 0.93 0.56 1.7 91 248
22 337 272 221 49 18 5.2 1.8 0.96 0.55 1.8 84 372
23 299 218 179 47 17 5 1.7 0.93 0.58 3.7 57 331
24 309 245 192 46 16 4.7 1.6 0.91 0.94 53 56 268
25 279 236 178 44 16 4.7 1.6 0.87 1.2 24 30 237
26 316 274 173 42 15 4.6 1.6 0.86 1.1 7.9 24 219
27 268 355 167 48 16 4.3 1.5 0.82 0.69 4.3 32 313
28 196 310 161 45 18 4.3 1.4 0.83 0.66 4.5 64 260
29 233 223 169 44 14 4.2 1.3 0.84 0.64 3.9 55 281
30 227   247 44 13 4.1 1.3 0.85 0.6 5.1 74 227
31 256   198   13   1.2 0.83   4   306