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Weather Forecast Office Philadelphia/Mount Holly, NJ Middle Atlantic River Forecast Center

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Hydrograph River at a Glance Download Weekly Chance of
Exceeding Levels		 Chance of Exceeding Levels
During Entire Period
Perkiomen Creek at Graterford Observed crest: 2.3 ft at 10:45am Feb 07 Observed: 1.55 ft at 9:45pm Feb 6 Observed: 1.55 ft at 10:00pm Feb 6 Observed: 1.56 ft at 10:15pm Feb 6 Observed: 1.56 ft at 10:30pm Feb 6 Observed: 1.56 ft at 10:45pm Feb 6 Observed: 1.56 ft at 11:00pm Feb 6 Observed: 1.57 ft at 11:15pm Feb 6 Observed: 1.57 ft at 11:30pm Feb 6 Observed: 1.57 ft at 11:45pm Feb 6 Observed: 1.57 ft at 12:00am Feb 7 Observed: 1.58 ft at 12:15am Feb 7 Observed: 1.58 ft at 12:30am Feb 7 Observed: 1.58 ft at 12:45am Feb 7 Observed: 1.58 ft at 1:00am Feb 7 Observed: 1.58 ft at 1:15am Feb 7 Observed: 1.58 ft at 1:30am Feb 7 Observed: 1.58 ft at 1:45am Feb 7 Observed: 1.58 ft at 2:00am Feb 7 Observed: 1.6 ft at 2:15am Feb 7 Observed: 1.62 ft at 2:30am Feb 7 Observed: 1.64 ft at 2:45am Feb 7 Observed: 1.66 ft at 3:00am Feb 7 Observed: 1.68 ft at 3:15am Feb 7 Observed: 1.69 ft at 3:30am Feb 7 Observed: 1.7 ft at 3:45am Feb 7 Observed: 1.73 ft at 4:00am Feb 7 Observed: 1.76 ft at 4:15am Feb 7 Observed: 1.78 ft at 4:30am Feb 7 Observed: 1.8 ft at 4:45am Feb 7 Observed: 1.82 ft at 5:00am Feb 7 Observed: 1.84 ft at 5:15am Feb 7 Observed: 1.87 ft at 5:30am Feb 7 Observed: 1.86 ft at 5:45am Feb 7 Observed: 1.89 ft at 6:00am Feb 7 Observed: 1.91 ft at 6:15am Feb 7 Observed: 1.94 ft at 6:30am Feb 7 Observed: 1.97 ft at 6:45am Feb 7 Observed: 2 ft at 7:00am Feb 7 Observed: 2.03 ft at 7:15am Feb 7 Observed: 2.05 ft at 7:30am Feb 7 Observed: 2.06 ft at 7:45am Feb 7 Observed: 2.06 ft at 8:00am Feb 7 Observed: 2.06 ft at 8:15am Feb 7 Observed: 2.06 ft at 8:30am Feb 7 Observed: 2.05 ft at 8:45am Feb 7 Observed: 2.05 ft at 8:46am Feb 7 Observed: 2.06 ft at 9:00am Feb 7 Observed: 2.07 ft at 9:15am Feb 7 Observed: 2.08 ft at 9:30am Feb 7 Observed: 2.12 ft at 9:45am Feb 7 Observed: 2.18 ft at 10:00am Feb 7 Observed: 2.21 ft at 10:15am Feb 7 Observed: 2.28 ft at 10:30am Feb 7 Observed: 2.3 ft at 10:45am Feb 7 Observed: 2.29 ft at 11:00am Feb 7 Observed: 2.26 ft at 11:15am Feb 7 Observed: 2.21 ft at 11:30am Feb 7 Observed: 2.14 ft at 11:45am Feb 7 Observed: 2.06 ft at 12:00pm Feb 7 Observed: 1.96 ft at 12:15pm Feb 7 Observed: 1.88 ft at 12:30pm Feb 7 Observed: 1.8 ft at 12:45pm Feb 7 Observed: 1.72 ft at 1:00pm Feb 7 Observed: 1.65 ft at 1:15pm Feb 7 Observed: 1.59 ft at 1:30pm Feb 7 Observed: 1.55 ft at 1:45pm Feb 7 Observed: 1.52 ft at 2:00pm Feb 7 Observed: 1.5 ft at 2:15pm Feb 7 Observed: 1.48 ft at 2:30pm Feb 7 Observed: 1.47 ft at 2:45pm Feb 7 Observed: 1.47 ft at 3:00pm Feb 7 Observed: 1.47 ft at 3:15pm Feb 7 Observed: 1.47 ft at 3:30pm Feb 7 Observed: 1.47 ft at 3:45pm Feb 7 Observed: 1.47 ft at 4:00pm Feb 7 Observed: 1.47 ft at 4:15pm Feb 7 Observed: 1.48 ft at 4:30pm Feb 7 Observed: 1.48 ft at 4:45pm Feb 7 Observed: 1.49 ft at 5:00pm Feb 7 Observed: 1.5 ft at 5:15pm Feb 7 Observed: 1.5 ft at 5:30pm Feb 7 Observed: 1.52 ft at 5:45pm Feb 7 Observed: 1.52 ft at 6:00pm Feb 7 Observed: 1.53 ft at 6:15pm Feb 7 Observed: 1.54 ft at 6:30pm Feb 7 Observed: 1.54 ft at 6:45pm Feb 7 Observed: 1.55 ft at 7:00pm Feb 7 Observed: 1.55 ft at 7:15pm Feb 7 Observed: 1.55 ft at 7:30pm Feb 7 Observed: 1.55 ft at 7:45pm Feb 7 Observed: 1.54 ft at 8:00pm Feb 7 Observed: 1.54 ft at 8:15pm Feb 7 Observed: 1.54 ft at 8:30pm Feb 7 Observed: 1.54 ft at 8:45pm Feb 7 Observed: 1.54 ft at 8:46pm Feb 7 Observed: 1.55 ft at 9:00pm Feb 7 Observed: 1.55 ft at 9:15pm Feb 7 Observed: 1.55 ft at 9:30pm Feb 7 Observed: 1.55 ft at 9:45pm Feb 7 Observed: 1.56 ft at 10:00pm Feb 7 Observed: 1.56 ft at 10:15pm Feb 7 Observed: 1.57 ft at 10:30pm Feb 7 Observed: 1.58 ft at 10:45pm Feb 7 Observed: 1.58 ft at 11:00pm Feb 7 Observed: 1.58 ft at 11:15pm Feb 7 Observed: 1.58 ft at 11:30pm Feb 7 Observed: 1.58 ft at 11:45pm Feb 7 Observed: 1.59 ft at 12:00am Feb 8 Observed: 1.6 ft at 12:15am Feb 8 Observed: 1.6 ft at 12:30am Feb 8 Observed: 1.6 ft at 12:45am Feb 8 Observed: 1.6 ft at 1:00am Feb 8 Observed: 1.6 ft at 1:15am Feb 8 Observed: 1.6 ft at 1:30am Feb 8 Observed: 1.6 ft at 1:45am Feb 8 Observed: 1.6 ft at 2:00am Feb 8 Observed: 1.6 ft at 2:15am Feb 8 Observed: 1.59 ft at 2:30am Feb 8 Observed: 1.59 ft at 2:45am Feb 8 Observed: 1.59 ft at 3:00am Feb 8 Observed: 1.58 ft at 3:15am Feb 8 Observed: 1.58 ft at 3:30am Feb 8 Observed: 1.58 ft at 3:45am Feb 8 Observed: 1.58 ft at 4:00am Feb 8 Observed: 1.57 ft at 4:15am Feb 8 Observed: 1.57 ft at 4:30am Feb 8 Observed: 1.56 ft at 4:45am Feb 8 Observed: 1.55 ft at 5:00am Feb 8 Observed: 1.55 ft at 5:15am Feb 8 Observed: 1.54 ft at 5:30am Feb 8 Observed: 1.54 ft at 5:45am Feb 8 Observed: 1.54 ft at 6:00am Feb 8 Observed: 1.54 ft at 6:15am Feb 8 Observed: 1.54 ft at 6:30am Feb 8 Observed: 1.54 ft at 6:45am Feb 8 Observed: 1.55 ft at 7:00am Feb 8 Observed: 1.56 ft at 7:15am Feb 8 Observed: 1.56 ft at 7:30am Feb 8 Observed: 1.56 ft at 7:45am Feb 8 Observed: 1.56 ft at 8:00am Feb 8 Observed: 1.56 ft at 8:15am Feb 8 Observed: 1.56 ft at 8:30am Feb 8 Observed: 1.56 ft at 8:45am Feb 8 Observed: 1.56 ft at 8:46am Feb 8 Observed: 1.58 ft at 9:00am Feb 8 Observed: 1.6 ft at 9:15am Feb 8 Observed: 1.63 ft at 9:30am Feb 8 Observed: 1.67 ft at 9:45am Feb 8 Observed: 1.72 ft at 10:00am Feb 8 Observed: 1.74 ft at 10:15am Feb 8 Observed: 1.74 ft at 10:30am Feb 8 Observed: 1.72 ft at 10:45am Feb 8 Observed: 1.66 ft at 11:00am Feb 8 Observed: 1.61 ft at 11:15am Feb 8 Observed: 1.56 ft at 11:30am Feb 8 Observed: 1.51 ft at 11:45am Feb 8 Observed: 1.47 ft at 12:00pm Feb 8 Observed: 1.44 ft at 12:15pm Feb 8 Observed: 1.41 ft at 12:30pm Feb 8 Observed: 1.39 ft at 12:45pm Feb 8 Observed: 1.38 ft at 1:00pm Feb 8 Observed: 1.37 ft at 1:15pm Feb 8 Observed: 1.36 ft at 1:30pm Feb 8 Observed: 1.36 ft at 1:45pm Feb 8 Observed: 1.36 ft at 2:00pm Feb 8 Observed: 1.37 ft at 2:15pm Feb 8 Observed: 1.37 ft at 2:30pm Feb 8 Observed: 1.38 ft at 2:45pm Feb 8 Observed: 1.38 ft at 3:00pm Feb 8 Observed: 1.38 ft at 3:15pm Feb 8 Observed: 1.38 ft at 3:30pm Feb 8 Observed: 1.39 ft at 3:45pm Feb 8 Observed: 1.39 ft at 4:00pm Feb 8 Observed: 1.4 ft at 4:15pm Feb 8 Observed: 1.4 ft at 4:30pm Feb 8 Observed: 1.41 ft at 4:45pm Feb 8 Observed: 1.42 ft at 5:00pm Feb 8 Observed: 1.42 ft at 5:15pm Feb 8 Observed: 1.43 ft at 5:30pm Feb 8 Observed: 1.44 ft at 5:45pm Feb 8 Observed: 1.44 ft at 6:00pm Feb 8 Observed: 1.45 ft at 6:15pm Feb 8 Observed: 1.45 ft at 6:30pm Feb 8 Observed: 1.46 ft at 6:45pm Feb 8 Observed: 1.46 ft at 7:00pm Feb 8 Observed: 1.46 ft at 7:15pm Feb 8 Observed: 1.46 ft at 7:30pm Feb 8 Observed: 1.46 ft at 7:45pm Feb 8 Observed: 1.46 ft at 8:00pm Feb 8 Observed: 1.46 ft at 8:15pm Feb 8 Observed: 1.45 ft at 8:30pm Feb 8 Observed: 1.45 ft at 8:45pm Feb 8 Observed: 1.45 ft at 8:46pm Feb 8 Observed: 1.45 ft at 9:00pm Feb 8 Observed: 1.45 ft at 9:15pm Feb 8 Observed: 1.45 ft at 9:30pm Feb 8 Observed: 1.44 ft at 9:45pm Feb 8 Observed: 1.44 ft at 10:00pm Feb 8 Observed: 1.45 ft at 10:15pm Feb 8 Observed: 1.45 ft at 10:30pm Feb 8 Observed: 1.45 ft at 10:45pm Feb 8 Observed: 1.46 ft at 11:00pm Feb 8 Observed: 1.46 ft at 11:15pm Feb 8 Observed: 1.46 ft at 11:30pm Feb 8 Observed: 1.46 ft at 11:45pm Feb 8 Observed: 1.46 ft at 12:00am Feb 9 Observed: 1.46 ft at 12:15am Feb 9 Observed: 1.46 ft at 12:30am Feb 9 Observed: 1.46 ft at 12:45am Feb 9 Observed: 1.46 ft at 1:00am Feb 9 Observed: 1.47 ft at 1:15am Feb 9 Observed: 1.47 ft at 1:30am Feb 9 Observed: 1.48 ft at 1:45am Feb 9 Observed: 1.49 ft at 2:00am Feb 9 Observed: 1.49 ft at 2:15am Feb 9 Observed: 1.5 ft at 2:30am Feb 9 Observed: 1.51 ft at 2:45am Feb 9 Observed: 1.51 ft at 3:00am Feb 9 Observed: 1.52 ft at 3:15am Feb 9 Observed: 1.53 ft at 3:30am Feb 9 Observed: 1.53 ft at 3:45am Feb 9 Observed: 1.54 ft at 4:00am Feb 9 Observed: 1.55 ft at 4:15am Feb 9 Observed: 1.56 ft at 4:30am Feb 9 Observed: 1.56 ft at 4:45am Feb 9 Observed: 1.57 ft at 5:00am Feb 9 Observed: 1.58 ft at 5:15am Feb 9 Observed: 1.58 ft at 5:30am Feb 9 Observed: 1.58 ft at 5:45am Feb 9 Observed: 1.58 ft at 6:00am Feb 9 Observed: 1.58 ft at 6:15am Feb 9 Observed: 1.58 ft at 6:30am Feb 9 Observed: 1.58 ft at 6:45am Feb 9 Observed: 1.58 ft at 7:00am Feb 9 Observed: 1.58 ft at 7:15am Feb 9 Observed: 1.58 ft at 7:30am Feb 9 Observed: 1.58 ft at 7:45am Feb 9 Observed: 1.58 ft at 8:00am Feb 9 Observed: 1.58 ft at 8:15am Feb 9 Observed: 1.58 ft at 8:30am Feb 9 Observed: 1.58 ft at 8:45am Feb 9 Observed: 1.58 ft at 8:46am Feb 9 Observed: 1.58 ft at 9:00am Feb 9 Observed: 1.59 ft at 9:15am Feb 9 Observed: 1.6 ft at 9:30am Feb 9 Observed: 1.61 ft at 9:45am Feb 9 Observed: 1.6 ft at 10:00am Feb 9 Observed: 1.55 ft at 10:15am Feb 9 Observed: 1.5 ft at 10:30am Feb 9 Observed: 1.47 ft at 10:45am Feb 9 Observed: 1.44 ft at 11:00am Feb 9 Observed: 1.4 ft at 11:15am Feb 9 Observed: 1.38 ft at 11:30am Feb 9 Observed: 1.37 ft at 11:45am Feb 9 Observed: 1.36 ft at 12:00pm Feb 9 Observed: 1.35 ft at 12:15pm Feb 9 Observed: 1.35 ft at 12:30pm Feb 9 Observed: 1.35 ft at 12:45pm Feb 9 Observed: 1.35 ft at 1:00pm Feb 9 Observed: 1.35 ft at 1:15pm Feb 9 Observed: 1.35 ft at 1:30pm Feb 9 Observed: 1.35 ft at 1:45pm Feb 9 Observed: 1.35 ft at 2:00pm Feb 9 Observed: 1.35 ft at 2:15pm Feb 9 Observed: 1.36 ft at 2:30pm Feb 9 Observed: 1.36 ft at 2:45pm Feb 9 Observed: 1.36 ft at 3:00pm Feb 9 Observed: 1.37 ft at 3:15pm Feb 9 Observed: 1.38 ft at 3:30pm Feb 9 Observed: 1.38 ft at 3:45pm Feb 9 Observed: 1.38 ft at 4:00pm Feb 9 Observed: 1.39 ft at 4:15pm Feb 9 Observed: 1.39 ft at 4:30pm Feb 9 Observed: 1.4 ft at 4:45pm Feb 9 Observed: 1.4 ft at 5:00pm Feb 9 Observed: 1.41 ft at 5:15pm Feb 9 Observed: 1.41 ft at 5:30pm Feb 9 Observed: 1.42 ft at 5:45pm Feb 9 Observed: 1.42 ft at 6:00pm Feb 9 Observed: 1.43 ft at 6:15pm Feb 9 Observed: 1.43 ft at 6:30pm Feb 9 Observed: 1.44 ft at 6:45pm Feb 9 Observed: 1.44 ft at 7:00pm Feb 9 Observed: 1.44 ft at 7:15pm Feb 9 Observed: 1.45 ft at 7:30pm Feb 9 Observed: 1.45 ft at 7:45pm Feb 9 Observed: 1.44 ft at 8:00pm Feb 9 Observed: 1.44 ft at 8:15pm Feb 9 Observed: 1.44 ft at 8:30pm Feb 9 Observed: 1.44 ft at 8:45pm Feb 9 Observed: 1.44 ft at 8:46pm Feb 9 Observed: 1.44 ft at 9:00pm Feb 9 Observed: 1.44 ft at 9:15pm Feb 9 Graph Created (10:04pm Feb 9, 2010) Observed USGS--Water Resources of the United States GRAP1 (plotting HGIRG) Gage 0 Datum: 112.66 Latest observed value: 1.44 ft at 9:15 PM EST 9-Feb-2010. Flood Stage is 11.0 ft. Stage (ft) Flow (kcfs)
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About this graph
Tabular Data
XML Data
RSS Files
Datum: N/A
Metadata
NOTE: Forecasts for the Perkiomen Creek at Graterford are issued as needed during times of high water, but are not routinely available.

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Flood Categories (in feet)
Major Flood Stage:16
Moderate Flood Stage:13
Flood Stage:11
Action Stage:9

Historical Crests
(1) 18.26 ft on 07/09/1935
(2) 17.08 ft on 06/22/1972
(3) 16.65 ft on 08/23/1933
(4) 16.59 ft on 09/16/1999
(5) 16.45 ft on 01/19/1996
Show More Historical Crests

Low Water Records
(1) 0 ft on 10/04/1941

 Perkiomen Creek at Graterford location map

Flood Impacts Collapse
18.7 Corp. of Engineers 100 yr Flood
13.5 Houses on left bank in Graterford flooded
13.0 Sewage treatment plant in Swenksville flooded
12.0 Penitentiary bridge is closed. Flooding begins in Collegville. Houses on the right bank in Graterford take on water
10.0 The first evacuations begin in Swenksville upstream of the gage
9.0 Flash Flood Alarm sounds at the County EOC
8.0 Park Avenue in Swencksville is flooded

About This Location Collapse
Latitude: 40.229400° N, Longitude: 75.451900° W, Horizontal Datum: NAD83

River Stage
Reference Frame		 Gauge Height Flood Stage Uses
NWS stage 0 ft 11 ft Interpreting hydrographs and NWS watch, warnings, and forecasts, and inundation maps
Vertical Datum Elevation
(gauge height = 0)		 Elevation
(gauge height = flood stage)		 Elevation information source
NAVD88 N/A N/A Survey grade GPS equipment, FEMA flood plain maps, newer USGS topographic maps
NGVD 29 112.66 ft 123.66 ft Older USGS topographic maps, NGVD29 benchmarks
MSL N/A N/A Older USGS topographic maps, MSL benchmarks
Other N/A N/A  

Other Data Sources:
U.S. Geological Survey (USGS) Data and Site Info for Graterford

Additional Information Collapse
ESP Expected Values plot
Probabilistic QPF Trace Ensemble
River Level Exceedence Chart

Resources Collapse
Hydrologic Resources
 Additional Resources
   

Collaborative Agencies Collapse
The National Weather Service prepares its forecasts and other services in collaboration with agencies like the US Geological Survey, US Bureau of Reclamation, US Army Corps of Engineers, Natural Resource Conservation Service, National Park Service, ALERT Users Group, Bureau of Indian Affairs, and many state and local emergency managers across the country. For details, please click here.

NWS Information
National Weather Service
Philadelphia/Mount Holly Weather Forecast Office
732 Woodlane Road
Mount Holly, NJ 08060-9615
(609) 261-6600
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