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USGS Surface-Water 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 12372000 Flathead River near Polson MT


Lake County, Montana
Hydrologic Unit Code 17010212
Latitude  47°40'49.03", Longitude 114°14'48.22" NAD83
Drainage area 7,079  square miles
Gage datum 2,692.7 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 2022-10-01 -> 2023-09-30)

Period-of-record for statistical calculation restricted by user
Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
1 8,540 8,970 8,310 5,150 5,900 13,500            
2 8,010 8,970 7,470 5,170 6,940 13,500            
3 7,960 8,970 6,700 5,160 7,800 12,700            
4 7,950 8,990 5,590 4,480 8,810 12,700            
5 7,960 9,000 4,940 4,390 9,910 12,700            
6 7,970 9,030 4,500 4,100 10,900 12,700            
7 7,970 9,020 4,460 3,960 13,300 12,700            
8 7,950 9,020 4,450 3,980 15,000 12,800            
9 7,950 9,030 4,450 3,950 18,000 12,700            
10 7,940 9,030 4,470 3,960 20,400 12,700            
11 7,960 9,020 4,460 3,950 24,400 12,700            
12 7,960 9,010 4,460 3,950 24,800 12,800            
13 7,990 9,060 4,460 3,920 24,900 12,700            
14 7,970 9,090 4,470 3,920 24,800 12,800            
15 8,010 9,090 4,460 3,900 22,300 12,700            
16 8,010 9,100 4,460 3,880 20,300 12,800            
17 7,960 9,080 4,460 3,970 20,400 12,700            
18 8,000 9,060 4,460 3,990 20,800 12,700            
19 7,980 9,060 4,460 3,940 20,500 12,700            
20 7,980 9,080 4,470 3,950 20,300 12,800            
21 7,960 9,120 4,460 4,040 20,100              
22 7,970 9,130 4,450 4,200 19,300              
23 8,140 9,650 4,450 4,200 16,200              
24 8,230 9,730 4,450 4,330 14,700              
25 8,210 9,300 4,450 4,450 14,500              
26 8,190 9,250 4,450 4,500 15,500              
27 8,120 9,240 4,470 4,720 16,600              
28 7,960 9,230 4,460 4,780 16,600              
29 8,780   4,460 4,930 16,600              
30 8,970   4,460 5,060 15,600              
31 9,020   4,820   14,200