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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 -> 2019-09-30)

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 81 64 45 58 42 72 33 56
2 76 73 73 107 72 60 36 43 36 57 35 52
3 79 87 91 87 74 88 53 35 27 36 43 49
4 80 86 88 85 82 74 48 40 41 25 40 62
5 71 81 92 92 78 73 48 39 46 32 52 58
6 61 70 88 81 102 50 42 45 110 38 47 65
7 68 82 94 82 79 70 35 35 45 30 56 71
8 65 69 80 82 74 49 61 35 91 48 65 60
9 74 60 78 88 73 53 52 38 54 37 54 76
10 62 65 75 82 61 55 38 47 43 50 51 60
11 60 67 77 70 65 55 51 42 37 37 43 98
12 68 79 92 67 90 57 42 64 33 41 58 65
13 59 81 87 87 76 72 53 68 35 30 70 67
14 81 94 97 74 70 63 56 30 39 44 49 65
15 70 78 82 94 82 51 49 27 27 37 51 68
16 64 72 81 107 117 48 49 24 38 45 65 84
17 52 70 93 89 79 48 35 34 33 34 53 60
18 65 84 80 68 78 55 36 56 37 32 42 57
19 90 96 92 65 93 69 33 30 32 55 41 50
20 87 76 89 85 73 72 41 37 23 40 57 49
21 74 77 128 76 71 85 68 48 33 39 48 77
22 64 90 99 78 68 344 55 42 40 33 53 65
23 67 106 110 67 81 104 66 37 49 60 49 65
24 90 100 95 66 63 60 53 37 30 35 46 62
25 86 93 73 69 56 60 39 49 49 51 68 63
26 90 95 95 87 82 76 31 36 76 54 55 83
27 68 74 90 87 61 57 31 37 46 60 57 60
28 79 75 99 88 73 51 45 37 42 59 84 56
29 65 76 101 66 69 44 46 26 39 54 76 65
30 66   96 93 62 51 34 21 49 54 57 66
31 64   91   68   31 34   34   67