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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 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 24.74 feet above NGVD29
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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
1 692 530 703 345 91 30 9.1 2.8 1.6 1.3 5.6 174
2 549 415 588 312 82 30 8.7 2.7 1.5 1.3 5.4 271
3 417 578 536 292 90 29 8.5 2.7 1.5 1.4 5.3 206
4 723 542 559 240 81 27 8.3 2.5 1.4 1.3 5.9 250
5 786 514 540 225 75 28 8.2 2.3 1.4 1.3 6.5 189
6 508 520 618 249 70 25 7.8 2.4 1.4 1.5 11 137
7 391 790 504 241 65 24 7.3 2.5 1.4 1.4 16 117
8 553 787 439 214 62 23 7 2.4 1.3 1.4 11 135
9 808 710 691 195 66 22 6.9 2.4 1.3 1.4 14 145
10 644 539 743 189 61 21 6.3 2.3 1.4 1.7 51 172
11 585 415 575 277 55 20 6 2.3 1.4 1.9 51 240
12 636 446 467 289 53 20 5.7 2.3 1.4 34 57 216
13 651 696 628 247 50 18 5.3 2.2 1.4 71 53 147
14 851 860 553 223 48 18 5 2.1 1.4 33 73 224
15 614 807 478 192 47 17 5 2.1 1.4 11 45 278
16 864 817 517 181 47 16 4.9 2.1 1.4 6.3 88 397
17 607 1,110 423 163 44 16 4.7 2.1 1.5 5 108 222
18 559 1,080 354 152 53 15 4.6 2.1 1.5 3.8 72 183
19 574 927 330 144 70 14 4.5 2.2 1.6 3.3 44 330
20 713 813 417 130 51 14 4.3 2.2 1.5 3.1 60 421
21 978 774 365 124 45 13 4.2 2.1 1.5 2.9 109 381
22 827 577 522 114 43 13 4.1 2 1.4 3 77 446
23 666 560 403 113 39 12 4.1 1.9 1.4 3 69 469
24 685 483 429 115 37 11 3.9 1.9 1.3 55 97 466
25 559 529 442 109 35 11 3.7 1.8 1.7 56 55 389
26 652 570 390 100 34 11 3.4 1.7 2 14 42 320
27 657 692 351 92 34 10 3.2 1.7 1.9 6.7 49 372
28 443 648 396 93 41 9.9 3.3 1.6 1.5 6.4 105 394
29 493 408 335 94 39 9.8 3.3 1.6 1.5 6.6 101 525
30 527   385 88 38 9.6 3.2 1.6 1.4 6.5 164 456
31 564   442   33   2.9 1.6   6.1   824