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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: NAVD88 Metadata

NOTE: Forecasts are not available for the Little Lehigh Creek near Allentown. Only observed stages are available for this point.

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Downstream Gauge

Flood Categories (in feet) Major Flood Stage: 10 Moderate Flood Stage: 8 Flood Stage: 5 Action Stage: 4 Low Stage (in feet): 0 Historic Crests (1) 12.76 ft on 08/04/2020 (2) 11.80 ft on 06/22/1972 (3) 10.93 ft on 10/08/2005 (4) 10.76 ft on 01/25/1979 (5) 10.63 ft on 09/18/2004 Show More Historic Crests (P): Preliminary values subject to further review. Recent Crests (1) 9.82 ft on 09/02/2021 (2) 5.29 ft on 12/25/2020 (3) 5.15 ft on 12/01/2020 (4) 12.76 ft on 08/04/2020 (5) 8.62 ft on 11/03/2018 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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7	Significant flooding occurs on both Millcreek Road and Macungie Road in Lower Macungie Township. The roads are impassable with several feet of moving water.
5.5	Millcreek Road at Hauser Road, Wild Cherry Lane, and Macungie Road in Lower Macungie Township begin to flood.
5	Spring Creek Road in Lower Macungie Township begins to flood between Millcreek Road and Millcreek Road. Spring Creek Road in Lower Macungie begins to flood between Heather Road and Laurel Lane. Creamery Road and Mill Race Road in Macungie Township also flood. Road closures and detours are put in place.
4	Water begins to overflow the lowest banks of the Little Lehigh and into designated open field and floodplain. Portions of the Millbrook Farms Recreation Area, the Danfield Run Passive Recreation Area, and the Winding Brook Manor Recreational Area begin to flood.

About This Location

Latitude: 40.582222° N, Longitude: 75.483333° W, Horizontal Datum: NAD83/WGS84 River Stage Reference Frame Gauge Height Flood Stage Uses NWS stage 0 ft 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 252.71 ft 257.71 ft Survey grade GPS equipment, FEMA flood plain maps, newer USGS topographic maps NGVD 29 253.41 ft 258.41 ft 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 Allentown

Additional Information

During winter months, cold and ice may result in inaccurate real-time stream stage and streamflow data. Adjustments or deletions of this data can only be done after detailed analysis.

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