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Weather Forecast Office Philadelphia/Mount Holly, NJ

Middle Atlantic River Forecast Center

Hydrograph

River at a Glance

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Printable Image About this graph Tabular Data (UTC) Tabular Data (EDT) Datum: NGVD29 Metadata

NOTE: Forecasts are not available for the East Branch Perkiomen Creek at Schwenksville. Only observed stages are available for this point.

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Flood Categories (in feet) Major Flood Stage: 12 Moderate Flood Stage: 10 Flood Stage: 8 Action Stage: 7 Low Stage (in feet): -9999 Historic Crests (1) 16.89 ft on 09/02/2021 (2) 14.03 ft on 09/16/1999 (3) 13.24 ft on 08/04/2020 (4) 13.21 ft on 10/19/1996 (5) 12.97 ft on 01/19/1996 Show More Historic Crests (P): Preliminary values subject to further review. Recent Crests (1) 16.89 ft on 09/02/2021 (2) 9.67 ft on 12/25/2020 (3) 8.31 ft on 11/30/2020 (4) 13.24 ft on 08/04/2020 (5) 8.37 ft on 09/28/2018 Show More Recent Crests (P): Preliminary values subject to further review. Low Water Records Currently none available. For more information on your flood risk go to www.floodsmart.gov. Show FEMA's National Flood Hazard Layers FEMA's National Flood Hazard Layers not showing? Why aren't the FEMA National Flood Hazard Layers showing on the ESRI Map? Possible reasons: There are no FEMA National Flood Hazard Layers for the location which you are viewing on ESRI Maps. The FEMA Web Mapping Service (WMS) is down. Note: Your zoom level may have changed. ESRI's zoom levels must be between 14 and 16 to show National Flood Hazard layers.

Zoom Level:16 Legend FEMA Layer Gauge Location Disclaimer Latitude/Longitude Disclaimer: The gauge location shown in the above map is the approximate location based on the latitude/longitude coordinates provided to the NWS by the gauge owner.

Flood Impacts & Photos

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12	Groff's Mill Road in Lower Salford is impassable. Homes between the river and the road take on water.
10	Groff's mill Road begins to flood and is subject to closures.
8	Bergey's Mill Park in Lower Salford begins to flood. The access road in and out of the park floods.
7	Adjacent fields begin to flood in Lower Salford.

About This Location

Latitude: 40.258611° N, Longitude: 75.429167° W, Horizontal Datum: NAD83/WGS84 River Stage Reference Frame Gauge Height Flood Stage Uses NWS stage 0 ft 8 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 Not Available Not Available Survey grade GPS equipment, FEMA flood plain maps, newer USGS topographic maps NGVD 29 150.0 157.0 Older USGS topographic maps, NGVD29 benchmarks MSL Not Available Not Available Older USGS topographic maps, MSL benchmarks Other Not Available Not Available   Current/Historical Observations: U.S. Geological Survey (USGS) Data and Site Info for Schwenksville

Resources

Hydrologic Resources Text Products Past Precipitation Forecast Precipitation River Forecast Centers River Stage Summary Inundation Mapping Locations

Additional Resources Area Hydrographs NWS Precipitation and River Forecasting AHPS Iframes for Developers Mobile iNWS for emergency management Snow Information Ensemble River Forecasts Hourly Precipitation

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