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USGS Daily Statistics for Pennsylvania

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[!] Over the next year, the USGS Pennsylvania Water Science Center will be updating the geodetic vertical elevation (gage datum) for many locations. Click HERE for additional information including a current list of streamgages with upcoming datum changes. This update in gage datum does not affect the location of the streamgage, nor the observed local gage height or discharge recorded at the streamgage.


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 01472199 West Branch Perkiomen Creek at Hillegass, PA


Montgomery County, Pennsylvania
Hydrologic Unit Code 02040203
Latitude  40°22'26", Longitude  75°31'22" NAD27
Drainage area 23.0  square miles
Contributing drainage area 23.0  square miles
Gage datum 290.00 feet above NGVD29
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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 1981-10-01 -> 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 51 38 54 69 55 34 29 21 38 32 32 53
2 43 44 74 81 42 50 24 27 34 25 30 50
3 43 64 50 84 50 35 20 20 21 23 40 51
4 47 62 55 69 50 38 18 56 20 21 24 47
5 38 49 56 65 49 38 19 21 18 26 25 61
6 38 57 51 63 57 35 25 18 34 19 26 47
7 36 46 55 59 50 40 42 25 36 17 22 48
8 42 37 66 60 46 31 23 18 29 59 32 40
9 40 33 60 54 45 31 25 16 28 28 30 43
10 44 36 76 69 49 30 22 19 21 25 31 43
11 39 40 73 52 46 29 39 23 20 26 27 62
12 46 44 65 51 49 29 33 19 19 26 31 62
13 42 52 65 64 57 46 32 46 19 24 32 60
14 43 42 71 46 49 32 28 24 19 23 26 62
15 36 52 62 63 39 27 32 21 46 24 28 44
16 40 58 53 106 46 31 22 16 44 24 39 53
17 36 47 56 65 45 29 20 20 25 21 40 64
18 46 52 53 51 39 29 24 19 41 19 29 58
19 79 46 58 50 48 29 19 17 21 42 29 39
20 64 48 61 56 45 50 17 15 21 28 35 36
21 38 55 75 49 36 40 17 23 16 28 34 55
22 33 51 91 48 38 31 32 39 16 23 37 43
23 43 53 73 50 35 28 38 25 33 24 54 53
24 61 66 71 47 36 27 34 16 29 28 34 55
25 71 67 59 48 34 31 23 14 24 23 39 67
26 56 49 53 56 36 30 27 14 24 22 43 46
27 52 47 63 49 38 26 34 13 50 37 41 44
28 49 52 74 49 31 41 34 43 47 45 65 61
29 47 54 69 45 64 29 21 18 38 41 45 62
30 42   67 63 52 23 17 16 30 41 57 42
31 46   67   40   21 14   33   42