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USGS Surface-Water 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 -> 2021-09-30)

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
1 196 235 267 170 49 12 3.8 1.3 0.84 0.6 3.6 104
2 176 223 242 172 39 12 3.6 1.3 0.73 0.63 3.3 150
3 143 203 229 145 41 11 3.5 1.3 0.71 0.66 3.1 179
4 296 250 280 179 36 12 3.5 1.3 0.7 0.67 3.1 153
5 316 238 232 142 35 11 3.3 1.2 0.71 0.89 3.4 109
6 204 286 235 140 32 10 3.2 1.2 0.72 0.75 6.9 97
7 213 303 195 119 29 10 3.1 1.1 0.71 0.79 7.2 109
8 303 337 165 99 28 9.6 3 1 0.76 0.78 5.8 80
9 313 317 240 90 29 9.4 2.9 1.1 0.74 0.81 9.1 87
10 272 241 225 101 26 8.9 2.8 1 0.7 1.7 24 100
11 242 189 225 124 24 8.6 2.7 1.1 0.67 2.1 30 123
12 268 266 188 117 22 8.5 2.5 1.1 0.63 20 32 86
13 339 340 242 99 22 7.9 2.4 1.1 0.63 33 31 74
14 383 359 205 97 21 7.5 2.2 0.99 0.62 12 30 130
15 280 317 187 87 20 7.2 2.1 1 0.61 4.9 24 210
16 421 350 207 81 20 6.9 2.1 0.98 0.66 3.4 50 175
17 325 501 171 72 19 6.7 2 1 0.72 2.6 60 110
18 274 342 152 67 31 6.4 2 0.99 0.95 2 51 127
19 248 299 169 60 31 6.2 1.9 0.96 0.75 1.9 33 252
20 358 319 182 55 23 5.8 2 0.96 0.65 1.7 39 202
21 517 256 183 54 22 5.4 1.9 0.98 0.59 1.8 55 257
22 323 279 213 50 19 5.3 1.8 1 0.58 1.9 34 389
23 307 224 178 48 17 5.1 1.8 0.98 0.6 3.9 39 326
24 320 253 195 47 16 4.9 1.6 0.95 0.99 6.6 52 266
25 289 245 182 45 16 4.8 1.6 0.91 1.2 5.6 28 234
26 330 285 177 43 15 4.7 1.6 0.9 1.2 4.3 23 219
27 279 369 171 50 17 4.4 1.6 0.86 0.73 2.7 32 300
28 203 318 160 46 18 4.4 1.4 0.87 0.69 3.9 67 259
29 243 224 166 46 14 4.4 1.4 0.88 0.67 3.6 57 273
30 237   250 45 14 4.2 1.3 0.89 0.63 5.1 77 215
31 266   201   13   1.3 0.87   4   299