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USGS Daily Statistics for Virginia

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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 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 -> 2024-09-30)

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 87 66 81 100 81 62 45 56 60 71 40 56
2 78 72 73 105 72 59 39 43 37 56 35 51
3 79 86 89 90 72 85 53 35 27 35 42 50
4 79 88 87 84 88 71 49 49 40 25 39 61
5 70 81 91 90 82 75 48 44 45 31 51 62
6 62 70 86 84 102 50 42 46 107 37 45 63
7 68 84 92 82 91 68 38 40 44 29 54 69
8 64 68 78 81 75 48 84 41 87 47 63 59
9 81 59 79 87 72 52 66 41 54 36 53 74
10 71 65 77 80 61 55 39 51 47 48 49 59
11 60 70 75 69 65 59 51 45 40 36 45 100
12 67 79 90 66 91 56 42 66 34 41 66 63
13 61 86 85 98 77 71 53 68 37 30 68 65
14 79 93 94 73 69 62 56 31 38 43 48 69
15 68 77 80 93 80 56 48 30 26 37 51 74
16 62 77 79 103 112 47 48 29 37 45 66 87
17 55 72 90 86 77 47 35 35 33 34 52 66
18 64 82 78 67 76 54 35 56 36 31 42 73
19 88 93 90 64 89 67 35 30 31 52 41 50
20 87 75 86 83 70 71 40 50 23 41 55 48
21 73 75 123 74 69 82 66 48 32 39 48 75
22 62 89 95 76 68 324 58 41 39 33 56 68
23 66 104 111 66 82 105 65 37 63 58 48 75
24 87 98 96 66 63 59 55 36 39 34 49 66
25 93 92 75 69 55 59 39 48 48 53 66 73
26 89 92 93 86 82 73 31 36 73 59 53 81
27 67 75 88 85 61 58 30 36 45 61 56 61
28 89 78 100 87 74 52 43 38 41 57 80 56
29 65 74 99 66 71 43 45 29 38 68 73 64
30 64   93 97 61 49 34 21 48 57 60 65
31 63   90   66   31 33   36   66