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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 -> 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
1 197 238 264 168 48 12 3.7 1.3 0.8 0.57 3.6 99
2 174 221 241 169 38 12 3.5 1.2 0.69 0.6 3.4 143
3 144 199 228 143 40 11 3.4 1.3 0.68 0.63 3.1 171
4 298 275 274 175 36 11 3.4 1.2 0.67 0.64 3.2 146
5 337 256 231 139 35 11 3.2 1.2 0.68 0.85 3.5 105
6 208 284 233 136 31 10 3.1 1.1 0.69 0.72 6.7 93
7 213 296 194 116 28 9.8 3 1.1 0.67 0.76 7 104
8 309 327 165 97 27 9.4 3 0.99 0.72 0.74 5.7 76
9 341 306 244 89 29 9.1 2.8 1 0.71 0.77 12 84
10 280 233 258 98 26 8.6 2.7 1 0.66 1.6 25 98
11 251 183 228 120 23 8.4 2.6 1.1 0.64 2 30 119
12 274 256 198 114 22 8.2 2.4 1.1 0.6 19 31 85
13 340 326 249 96 22 7.7 2.3 1 0.6 31 30 80
14 404 344 231 95 20 7.3 2.2 0.95 0.59 12 29 132
15 288 304 196 85 20 7.1 2.1 0.96 0.58 4.6 23 206
16 415 336 207 80 20 6.7 2.1 0.94 0.63 3.3 48 180
17 319 482 170 70 19 6.5 2 0.97 0.69 2.5 57 110
18 268 340 151 66 30 6.2 2 0.94 0.9 1.9 49 124
19 242 316 168 59 30 6 1.9 0.92 0.71 1.8 32 243
20 348 327 179 54 23 5.7 1.9 0.91 0.62 1.6 37 196
21 503 255 188 54 21 5.3 1.8 0.93 0.56 1.7 52 247
22 340 273 222 49 18 5.2 1.8 0.96 0.55 1.8 32 374
23 301 219 179 47 17 5 1.7 0.93 0.58 3.7 37 331
24 312 246 193 46 16 4.7 1.6 0.91 0.94 53 50 264
25 282 237 179 44 16 4.7 1.6 0.87 1.2 24 27 234
26 319 276 173 42 15 4.6 1.6 0.86 1.1 7.9 22 216
27 271 358 168 48 16 4.3 1.5 0.82 0.69 4.3 31 304
28 198 312 162 45 18 4.3 1.4 0.83 0.66 4.5 64 255
29 235 223 170 44 14 4.2 1.3 0.84 0.64 3.9 55 269
30 229   249 44 13 4.1 1.3 0.85 0.6 5.1 74 221
31 258   199   13   1.2 0.83   4   304