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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 11467510 SF GUALALA R NR THE SEA RANCH CA


Sonoma County, California
Hydrologic Unit Code 18010109
Latitude  38°42'33", Longitude 123°25'32" NAD27
Drainage area 161  square miles
Gage datum 42.31 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 1990-10-01 -> 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
1 439 705 548 588 105 43 14 4.2 1.7 1.4 85 252
2 353 1,010 785 542 100 41 13 4.2 1.6 1.4 70 578
3 481 1,190 770 451 118 39 13 4 1.6 1.6 45 406
4 1,430 1,700 740 424 120 42 12 3.8 1.6 2.8 54 244
5 1,200 1,190 660 441 294 51 11 3.7 1.6 7.2 32 208
6 880 879 1,120 643 140 42 11 3.6 1.5 5.2 25 304
7 1,040 1,390 887 674 111 37 11 3.5 1.5 3.4 67 272
8 1,440 1,240 548 419 95 34 11 3.4 1.5 2.7 48 212
9 1,380 1,430 502 336 86 33 10 3.3 1.5 2.4 102 185
10 1,250 844 1,140 281 79 30 9.8 3.3 1.4 3.8 70 422
11 920 476 705 349 74 28 9.5 3.2 1.4 8.7 47 1,000
12 746 379 788 528 70 27 9 3.1 1.4 5.9 36 405
13 890 919 1,000 435 66 25 8.7 3 1.4 9.3 29 415
14 998 1,280 1,420 342 61 24 8.3 2.9 1.4 16 26 783
15 645 832 885 280 68 23 7.9 2.8 1.4 6.3 24 969
16 808 911 882 263 199 22 7.5 2.6 1.4 6.1 34 964
17 1,030 818 846 222 183 21 7.1 2.5 1.4 6.3 32 620
18 1,180 807 564 200 147 21 6.9 2.5 1.5 6.4 34 707
19 1,090 748 485 186 197 20 6.8 2.4 2.6 7.6 141 851
20 1,390 863 753 189 123 19 6.6 2.4 3.9 11 184 981
21 1,370 604 541 213 109 18 6.4 2.4 2.9 7.4 747 1,270
22 1,580 793 648 178 91 17 6.2 2.3 2.4 16 670 1,090
23 1,110 651 614 155 76 17 5.8 2.3 2 16 267 1,060
24 600 768 901 137 66 16 5.6 2.2 1.8 881 193 788
25 1,000 727 663 126 63 16 5.3 2.2 1.7 287 114 638
26 1,130 1,940 633 118 66 18 5 2.1 1.6 72 133 553
27 651 1,550 990 176 64 17 4.9 2 1.6 40 166 1,050
28 446 667 1,000 156 62 16 4.8 1.9 1.6 55 145 714
29 379 325 742 130 54 17 4.7 1.8 1.5 118 210 1,200
30 346   568 115 50 15 4.5 1.7 1.5 104 672 1,030
31 626   572   47   4.4 1.7   68   775