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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 01650500 NORTHWEST BRANCH ANACOSTIA RIVER NR COLESVILLE, MD


Montgomery County, Maryland
Hydrologic Unit Code 02070010
Latitude  39°03'55.9", Longitude  77°01'45.7" NAD83
Drainage area 21.0  square miles
Gage datum 264.05 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 1923-10-01 -> 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 40 27 29 36 26 19 12 21 28 17 17 22
2 27 28 29 37 25 22 17 16 14 18 12 18
3 35 36 37 34 26 33 25 15 12 12 15 17
4 24 33 27 27 27 23 15 23 13 12 15 20
5 24 28 37 31 25 26 14 14 31 10 16 22
6 22 27 37 37 23 18 13 13 34 13 15 23
7 25 40 33 29 33 31 10 13 17 16 20 29
8 22 31 28 33 24 17 19 17 16 26 23 25
9 36 22 29 33 22 17 20 19 14 13 17 29
10 25 25 28 28 19 22 15 15 19 17 15 22
11 21 30 30 25 24 19 13 13 13 13 15 34
12 21 25 39 26 40 16 13 32 13 12 24 22
13 20 39 37 37 28 24 14 23 12 14 27 18
14 34 42 36 29 21 18 18 12 17 16 16 26
15 22 32 28 37 27 16 28 11 8.7 12 17 30
16 21 29 29 36 42 14 14 12 25 16 27 34
17 20 29 30 30 22 18 11 17 13 15 19 26
18 25 34 27 25 22 21 14 20 16 15 19 29
19 23 38 36 23 21 20 11 13 13 18 20 18
20 28 29 31 31 20 21 20 15 8.5 14 18 19
21 27 28 47 25 21 27 23 12 13 11 21 27
22 24 37 34 28 25 49 17 12 15 12 20 23
23 25 37 37 21 29 24 18 28 23 17 14 26
24 32 36 33 23 24 14 12 13 13 9.9 20 22
25 33 40 25 26 24 27 11 20 21 18 30 26
26 33 41 34 38 25 37 11 16 35 20 21 35
27 21 29 27 32 23 22 16 21 12 20 20 22
28 30 33 32 32 28 17 20 14 13 18 21 22
29 21 27 28 21 23 15 22 11 15 34 22 24
30 24   36 51 18 18 11 7.5 27 21 23 23
31 26   28   23   11 10   14   22