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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: Not Available Metadata

NOTE: Graphical forecasts are not available for the Little Lehigh Creek near Trexlertown. During times of high water, forecast crest information can be found in the text products.

Default Hydrograph Scale to Flood Categories   Return to Area Map

Downstream Gauge

Flood Categories (in feet) Major Flood Stage: 7 Moderate Flood Stage: 5.7 Flood Stage: 4.5 Action Stage: 3 Low Stage (in feet): -9999 Historic Crests (1) 6.74 ft on 01/10/2024 (2) 5.79 ft on 12/18/2023 (3) 4.89 ft on 12/28/2023 (4) 4.76 ft on 04/08/2022 (5) 2.43 ft on 09/10/2020 (P): Preliminary values subject to further review. Recent Crests (1) 6.74 ft on 01/10/2024 (2) 4.89 ft on 12/28/2023 (3) 5.79 ft on 12/18/2023 (4) 4.76 ft on 04/08/2022 (5) 2.43 ft on 09/10/2020 (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

If you notice any errors in the below information, please contact our Webmaster
10	Maximum recordable water level.
7	Mertztown Rd in Lower Macungie floods. Rt 100 floods toward Macungie. Bridges across the Little Lehigh including Wild Cherry Ln, Macungie Rd, and Willow Rd are subject to closures. Leibert Creek backs up due to high water on the Little Lehigh at Indian Creek Rd in Lower Macungie and Upper Milford. Bridges over Leibert Creek are subject to closures. Businesses and Lower Macungie Township buildings flood on Brookside Rd. Swabia Creek backs up due to high water on the Little Lehigh resulting in flooding.
5.7	Creamery Road in Lower Macungie begins to flood. Backyards along Mertztown Road flood all the way to Berks County. Wildlands Conservancy in Emmaus starts to flood. Leibert Creek backs up due to high water on the Little Lehigh and starts to flood Emmaus Community Park.
4.5	Spring Creek Road floods and is closed. Front yards along Spring Creek Road also begin to flood.
3	Ancient Oak West Recreation Area floods. Yards backing the creek on Aster Road in Lower Macungie begin to flood.

About This Location

Latitude: 40.534183° N, Longitude: 75.601433° W, Horizontal Datum: NAD83/WGS84 River Stage Reference Frame Gauge Height Flood Stage Uses NWS stage 0 ft 4.5 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 370 374.50 Survey grade GPS equipment, FEMA flood plain maps, newer USGS topographic maps NGVD 29 Not Available Not Available 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 Trexlertown

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

Collaborative Agencies 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 Ask Questions/Webmaster Page last modified: 2-Nov-2020 7:30 PM Disclaimer Credits Glossary Privacy Policy About Us Career Opportunities