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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 -> 2020-09-30)

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 67 79 99 80 63 45 58 42 72 39 56
2 76 73 72 107 74 60 36 43 36 56 35 51
3 78 87 91 87 74 88 54 35 27 35 43 49
4 80 85 88 85 82 74 48 39 40 25 40 62
5 71 81 91 92 83 73 49 39 46 31 52 58
6 61 71 87 81 103 50 42 45 108 38 47 64
7 68 85 94 82 79 70 35 37 44 30 56 71
8 64 69 80 82 74 49 87 35 90 48 65 60
9 74 60 77 88 73 53 53 38 53 37 54 76
10 62 66 75 82 62 55 38 47 43 49 50 60
11 60 70 76 69 67 55 52 42 37 37 43 98
12 68 80 92 67 93 57 43 63 33 40 58 64
13 59 81 87 88 79 73 53 67 35 29 69 67
14 80 94 96 74 71 63 55 30 39 44 49 65
15 69 78 81 94 82 51 48 29 26 37 51 68
16 63 72 81 106 116 47 49 25 38 46 64 84
17 52 70 92 88 79 48 35 34 32 34 53 61
18 65 83 80 68 77 55 36 56 37 31 42 57
19 90 95 92 65 92 69 33 30 32 54 41 50
20 87 76 88 86 73 72 40 41 23 43 57 49
21 74 77 127 76 71 85 67 48 32 40 47 76
22 63 90 98 78 68 341 55 42 39 33 53 65
23 67 106 110 67 81 103 66 37 49 60 49 64
24 89 100 95 65 64 60 53 37 30 34 50 62
25 95 92 73 69 56 61 39 49 49 51 68 63
26 90 94 95 87 81 76 31 36 75 54 55 82
27 68 76 90 87 61 57 31 36 46 62 57 59
28 79 75 99 87 73 53 45 37 41 59 83 55
29 64 75 101 66 69 45 46 26 39 54 76 65
30 65   96 93 62 51 34 21 49 54 57 66
31 64   91   68   31 33   36   67