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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 01646000 DIFFICULT RUN NEAR GREAT FALLS, VA


Fairfax County, Virginia
Hydrologic Unit Code 02070008
Latitude  38°58'33", Longitude  77°14'46" NAD27
Drainage area 57.8  square miles
Gage datum 150.94 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 1934-10-01 -> 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 88 67 83 100 82 63 45 58 43 71 40 57
2 79 73 73 106 73 60 36 43 36 56 36 52
3 80 86 91 86 74 86 53 35 27 35 43 49
4 80 85 88 85 86 73 48 49 41 25 40 62
5 71 81 91 91 83 77 48 40 46 31 52 63
6 61 71 87 80 103 51 42 46 108 38 46 65
7 68 86 93 82 79 69 39 37 44 30 55 71
8 64 69 79 81 74 48 86 35 90 47 64 60
9 74 60 77 88 73 52 52 38 53 36 54 76
10 62 66 75 81 62 55 38 47 48 49 50 60
11 60 71 76 69 66 57 52 41 37 36 44 98
12 68 80 91 67 92 57 43 68 33 42 66 64
13 59 81 87 100 78 73 53 69 35 30 70 67
14 80 94 95 75 70 63 55 31 38 44 49 71
15 69 78 81 95 81 50 48 29 26 37 51 69
16 63 77 81 105 114 47 48 28 37 45 64 87
17 52 70 92 87 78 48 35 35 32 34 53 66
18 64 83 80 68 76 56 36 56 37 31 42 58
19 89 95 91 65 91 69 33 30 32 54 41 50
20 86 76 88 85 72 74 40 41 23 42 56 49
21 73 77 126 75 70 85 67 48 32 40 47 76
22 63 91 97 77 67 337 60 42 39 33 52 65
23 66 106 109 67 81 103 67 37 48 60 48 64
24 89 100 97 67 63 59 56 37 30 34 49 67
25 94 92 74 70 56 60 39 49 48 51 67 74
26 90 94 94 88 81 75 31 36 75 54 54 83
27 68 77 89 86 62 57 31 36 46 62 57 60
28 78 79 101 87 74 53 44 38 41 58 82 55
29 64 75 101 66 71 44 45 29 39 62 75 65
30 65   95 96 62 50 34 21 49 57 62 66
31 63   91   67   32 34   36   67