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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 11458000 NAPA R NR NAPA CA


Napa County, California
Hydrologic Unit Code 18050002
Latitude  38°22'06", Longitude 122°18'08" NAD27
Drainage area 218  square miles
Gage datum 27.14 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 1959-10-01 -> 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
1 693 526 696 343 91 30 9.1 2.8 1.6 1.3 5.6 173
2 549 438 582 311 82 30 8.7 2.7 1.5 1.3 5.4 268
3 419 597 531 291 90 29 8.5 2.7 1.5 1.4 5.3 204
4 721 645 553 239 81 27 8.3 2.5 1.4 1.3 5.8 247
5 781 612 535 224 75 28 8.2 2.3 1.4 1.3 6.4 188
6 507 553 612 248 70 25 7.8 2.4 1.4 1.5 10 136
7 390 831 499 240 65 24 7.3 2.5 1.4 1.4 16 117
8 549 802 435 213 62 23 7 2.4 1.3 1.4 11 134
9 800 717 682 194 66 22 6.9 2.4 1.3 1.4 14 144
10 638 545 734 188 61 21 6.3 2.3 1.4 1.7 51 171
11 580 420 569 274 55 20 6 2.3 1.4 1.9 50 238
12 630 448 463 286 53 20 5.7 2.3 1.4 34 56 214
13 644 737 622 245 50 18 5.3 2.2 1.4 71 52 146
14 841 902 549 221 48 18 5 2.1 1.4 33 72 269
15 608 820 476 192 47 17 5 2.1 1.4 11 44 295
16 854 822 513 181 47 16 4.9 2.1 1.4 6.3 87 411
17 601 1,110 427 163 44 16 4.7 2.1 1.5 5 106 238
18 554 1,070 356 152 53 15 4.6 2.1 1.5 3.8 71 193
19 568 922 330 144 70 14 4.5 2.2 1.6 3.3 44 335
20 704 808 415 130 51 14 4.3 2.2 1.5 3.1 59 422
21 966 769 364 124 45 13 4.2 2.1 1.5 2.9 147 382
22 817 574 518 114 43 13 4.1 2 1.4 3 176 446
23 658 557 400 113 39 12 4.1 1.9 1.4 3 121 470
24 676 480 426 115 37 11 3.9 1.9 1.3 55 109 471
25 553 525 438 109 35 11 3.7 1.8 1.7 56 61 395
26 644 566 387 100 34 11 3.4 1.7 2 14 46 325
27 649 685 348 92 34 10 3.2 1.7 1.9 6.7 52 389
28 438 641 392 93 41 9.9 3.3 1.6 1.5 6.4 106 404
29 487 408 333 94 39 9.8 3.3 1.6 1.5 6.6 102 544
30 521   382 88 38 9.6 3.2 1.6 1.4 6.5 163 471
31 557   438   33   2.9 1.6   6.1   825