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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 -> 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
1 193 233 264 168 49 12 3.8 1.3 0.84 0.6 3.6 103
2 174 221 239 170 39 12 3.6 1.3 0.73 0.63 3.3 148
3 141 201 226 144 41 11 3.5 1.3 0.71 0.66 3.1 177
4 293 248 277 177 36 12 3.5 1.3 0.7 0.67 3.1 151
5 312 235 229 142 35 11 3.3 1.2 0.71 0.89 3.4 108
6 201 282 232 140 32 10 3.2 1.2 0.72 0.75 6.8 96
7 211 299 192 119 29 10 3.1 1.1 0.71 0.79 7.1 107
8 299 333 163 99 28 9.6 3 1 0.76 0.78 5.7 79
9 309 313 237 90 29 9.4 2.9 1.1 0.74 0.81 9 86
10 269 238 222 101 26 8.9 2.8 1 0.7 1.7 24 99
11 239 187 223 124 24 8.6 2.7 1.1 0.67 2.1 30 122
12 264 263 186 117 22 8.5 2.5 1.1 0.63 20 31 85
13 335 336 239 99 22 7.9 2.4 1.1 0.63 33 30 73
14 378 355 202 97 21 7.5 2.2 0.99 0.62 12 29 128
15 276 313 185 87 20 7.2 2.1 1 0.61 4.9 24 208
16 416 346 204 81 20 6.9 2.1 0.98 0.66 3.4 50 172
17 321 495 169 72 19 6.7 2 1 0.72 2.6 59 109
18 271 337 151 67 31 6.4 2 0.99 0.95 2 50 125
19 245 295 167 60 31 6.2 1.9 0.96 0.75 1.9 33 248
20 354 316 180 55 23 5.8 2 0.96 0.65 1.7 38 199
21 511 253 181 54 22 5.4 1.9 0.98 0.59 1.8 54 254
22 319 276 210 50 19 5.3 1.8 1 0.58 1.9 33 384
23 303 222 176 48 17 5.1 1.8 0.98 0.6 3.9 38 322
24 316 250 193 47 16 4.9 1.6 0.95 0.99 6.5 52 262
25 285 242 180 45 16 4.8 1.6 0.91 1.2 5.5 28 231
26 326 282 175 43 15 4.7 1.6 0.9 1.2 4.3 22 216
27 276 365 169 50 17 4.4 1.6 0.86 0.73 2.6 32 296
28 201 314 158 46 18 4.4 1.4 0.87 0.69 3.8 66 255
29 240 224 164 46 14 4.4 1.4 0.88 0.67 3.6 56 270
30 235   247 45 14 4.2 1.3 0.89 0.63 5 76 212
31 263   198   13   1.3 0.87   4   295