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Web Portal Changes: In Spring 2024, the Advanced Hydrologic Prediction Service (AHPS) hosted at https://water.weather.gov will be replaced by the National Water Prediction Service (NWPS) at a repurposed https://water.noaa.gov. A preview of NWPS is available here, where you can see your station hydrograph by replacing SSSSS with the station 5-character id: https://preview.water.noaa.gov/gauges/SSSSS.

Flood Inundation Mapping: Experimental real-time flood Inundation mapping services for 10% of the United States are now available via the NWS Map Viewer. Additional products and geospatial services depicting River Forecast Center and National Water Model forecasts continue to be accessible as described in the StoryMap here.

Please visit https://www.weather.gov/owp/operations for more information.



Hydrograph River at a Glance Download
Tulpehocken Creek at Blue Marsh Dam Pool (ft)Observed: 285.07 ft at 12:30PM Feb 28, 2024Observed: 285.06 ft at 1:00PM Feb 28, 2024Observed: 285.07 ft at 1:30PM Feb 28, 2024Observed: 285.09 ft at 2:00PM Feb 28, 2024Observed: 285.08 ft at 2:30PM Feb 28, 2024Observed: 285.1 ft at 3:00PM Feb 28, 2024Observed: 285.12 ft at 3:30PM Feb 28, 2024Observed: 285.12 ft at 4:00PM Feb 28, 2024Observed: 285.14 ft at 4:30PM Feb 28, 2024Observed: 285.14 ft at 5:00PM Feb 28, 2024Observed: 285.14 ft at 5:30PM Feb 28, 2024Observed: 285.18 ft at 6:00PM Feb 28, 2024Observed: 285.17 ft at 6:30PM Feb 28, 2024Observed: 285.21 ft at 7:00PM Feb 28, 2024Observed: 285.22 ft at 7:30PM Feb 28, 2024Observed: 285.24 ft at 8:00PM Feb 28, 2024Observed: 285.24 ft at 8:30PM Feb 28, 2024Observed: 285.22 ft at 9:00PM Feb 28, 2024Observed: 285.27 ft at 9:30PM Feb 28, 2024Observed: 285.25 ft at 10:00PM Feb 28, 2024Observed: 285.29 ft at 10:30PM Feb 28, 2024Observed: 285.3 ft at 11:00PM Feb 28, 2024Observed: 285.3 ft at 11:01PM Feb 28, 2024Observed: 285.3 ft at 11:30PM Feb 28, 2024Observed: 285.29 ft at 12:00AM Feb 29, 2024Observed: 285.3 ft at 12:30AM Feb 29, 2024Observed: 285.33 ft at 1:00AM Feb 29, 2024Observed: 285.34 ft at 1:30AM Feb 29, 2024Observed: 285.32 ft at 2:00AM Feb 29, 2024Observed: 285.36 ft at 2:30AM Feb 29, 2024Observed: 285.34 ft at 3:00AM Feb 29, 2024Observed: 285.36 ft at 3:30AM Feb 29, 2024Observed: 285.36 ft at 4:00AM Feb 29, 2024Observed: 285.38 ft at 4:30AM Feb 29, 2024Observed: 285.37 ft at 5:00AM Feb 29, 2024Observed: 285.38 ft at 5:30AM Feb 29, 2024Observed: 285.39 ft at 6:00AM Feb 29, 2024Observed: 285.4 ft at 6:30AM Feb 29, 2024Observed: 285.41 ft at 7:00AM Feb 29, 2024Observed: 285.41 ft at 7:30AM Feb 29, 2024Observed: 285.42 ft at 8:00AM Feb 29, 2024Observed: 285.43 ft at 8:30AM Feb 29, 2024Observed: 285.43 ft at 9:00AM Feb 29, 2024Observed: 285.43 ft at 9:30AM Feb 29, 2024Observed: 285.43 ft at 10:00AM Feb 29, 2024Observed: 285.42 ft at 10:30AM Feb 29, 2024Observed: 285.42 ft at 11:00AM Feb 29, 2024Observed: 285.42 ft at 11:01AM Feb 29, 2024Observed: 285.41 ft at 11:30AM Feb 29, 2024Observed: 285.43 ft at 12:00PM Feb 29, 2024Observed: 285.42 ft at 12:30PM Feb 29, 2024Observed: 285.42 ft at 1:00PM Feb 29, 2024Observed: 285.42 ft at 1:30PM Feb 29, 2024Observed: 285.43 ft at 2:00PM Feb 29, 2024Observed: 285.41 ft at 2:30PM Feb 29, 2024Observed: 285.41 ft at 3:00PM Feb 29, 2024Observed: 285.41 ft at 3:30PM Feb 29, 2024Observed: 285.4 ft at 4:00PM Feb 29, 2024Observed: 285.42 ft at 4:30PM Feb 29, 2024Observed: 285.42 ft at 5:00PM Feb 29, 2024Observed: 285.41 ft at 5:30PM Feb 29, 2024Observed: 285.4 ft at 6:00PM Feb 29, 2024Observed: 285.4 ft at 6:30PM Feb 29, 2024Observed: 285.39 ft at 7:00PM Feb 29, 2024Observed: 285.4 ft at 7:30PM Feb 29, 2024Observed: 285.4 ft at 8:00PM Feb 29, 2024Observed: 285.39 ft at 8:30PM Feb 29, 2024Observed: 285.39 ft at 9:00PM Feb 29, 2024Observed: 285.39 ft at 9:30PM Feb 29, 2024Observed: 285.39 ft at 10:00PM Feb 29, 2024Observed: 285.39 ft at 10:30PM Feb 29, 2024Observed: 285.38 ft at 11:00PM Feb 29, 2024Observed: 285.38 ft at 11:01PM Feb 29, 2024Observed: 285.39 ft at 11:30PM Feb 29, 2024Observed: 285.38 ft at 12:00AM Mar 01, 2024Observed: 285.38 ft at 12:30AM Mar 01, 2024Observed: 285.37 ft at 1:00AM Mar 01, 2024Observed: 285.37 ft at 1:30AM Mar 01, 2024Observed: 285.37 ft at 2:00AM Mar 01, 2024Observed: 285.37 ft at 2:30AM Mar 01, 2024Observed: 285.36 ft at 3:00AM Mar 01, 2024Observed: 285.36 ft at 3:30AM Mar 01, 2024Observed: 285.36 ft at 4:00AM Mar 01, 2024Observed: 285.35 ft at 4:30AM Mar 01, 2024Observed: 285.35 ft at 5:00AM Mar 01, 2024Observed: 285.35 ft at 5:30AM Mar 01, 2024Observed: 285.35 ft at 6:00AM Mar 01, 2024Observed: 285.34 ft at 6:30AM Mar 01, 2024Observed: 285.34 ft at 7:00AM Mar 01, 2024Observed: 285.34 ft at 7:30AM Mar 01, 2024Observed: 285.34 ft at 8:00AM Mar 01, 2024Observed: 285.34 ft at 8:30AM Mar 01, 2024Observed: 285.33 ft at 9:00AM Mar 01, 2024Observed: 285.34 ft at 9:30AM Mar 01, 2024Observed: 285.33 ft at 10:00AM Mar 01, 2024Observed: 285.34 ft at 10:30AM Mar 01, 2024Observed: 285.34 ft at 11:00AM Mar 01, 2024Observed: 285.34 ft at 11:30AM Mar 01, 2024Observed: 285.34 ft at 11:31AM Mar 01, 2024Observed: 285.34 ft at 12:00PM Mar 01, 2024Observed: 285.33 ft at 12:30PM Mar 01, 2024Observed: 285.33 ft at 1:00PM Mar 01, 2024Observed: 285.34 ft at 1:30PM Mar 01, 2024Observed: 285.35 ft at 2:00PM Mar 01, 2024Observed: 285.34 ft at 2:30PM Mar 01, 2024Observed: 285.36 ft at 3:00PM Mar 01, 2024Observed: 285.35 ft at 3:30PM Mar 01, 2024Observed: 285.35 ft at 4:00PM Mar 01, 2024Observed: 285.35 ft at 4:30PM Mar 01, 2024Observed: 285.35 ft at 5:00PM Mar 01, 2024Observed: 285.35 ft at 5:30PM Mar 01, 2024Observed: 285.36 ft at 6:00PM Mar 01, 2024Observed: 285.36 ft at 6:30PM Mar 01, 2024Observed: 285.36 ft at 7:00PM Mar 01, 2024Observed: 285.36 ft at 7:30PM Mar 01, 2024Observed: 285.36 ft at 8:00PM Mar 01, 2024Observed: 285.36 ft at 8:30PM Mar 01, 2024Observed: 285.37 ft at 9:00PM Mar 01, 2024Observed: 285.37 ft at 9:30PM Mar 01, 2024Observed: 285.37 ft at 10:00PM Mar 01, 2024Observed: 285.37 ft at 10:30PM Mar 01, 2024Observed: 285.38 ft at 11:00PM Mar 01, 2024Observed: 285.37 ft at 11:30PM Mar 01, 2024Observed: 285.37 ft at 11:31PM Mar 01, 2024Observed: 285.38 ft at 12:00AM Mar 02, 2024Observed: 285.38 ft at 12:30AM Mar 02, 2024Observed: 285.38 ft at 1:00AM Mar 02, 2024Observed: 285.38 ft at 1:30AM Mar 02, 2024Observed: 285.38 ft at 2:00AM Mar 02, 2024Observed: 285.38 ft at 2:30AM Mar 02, 2024Observed: 285.39 ft at 3:00AM Mar 02, 2024Observed: 285.39 ft at 3:30AM Mar 02, 2024Observed: 285.4 ft at 4:00AM Mar 02, 2024Observed: 285.4 ft at 4:30AM Mar 02, 2024Observed: 285.4 ft at 5:00AM Mar 02, 2024Observed: 285.41 ft at 5:30AM Mar 02, 2024Observed: 285.41 ft at 6:00AM Mar 02, 2024Observed: 285.41 ft at 6:30AM Mar 02, 2024Observed: 285.42 ft at 7:00AM Mar 02, 2024Observed: 285.43 ft at 7:30AM Mar 02, 2024Observed: 285.44 ft at 8:00AM Mar 02, 2024Observed: 285.44 ft at 8:30AM Mar 02, 2024Observed: 285.45 ft at 9:00AM Mar 02, 2024Observed: 285.46 ft at 9:30AM Mar 02, 2024Observed: 285.47 ft at 10:00AM Mar 02, 2024Observed: 285.47 ft at 10:30AM Mar 02, 2024Observed: 285.49 ft at 11:00AM Mar 02, 2024Highest Observation: 285.5 ft at 11:32AM Mar 02, 2024USGS--Water Resources of the United StatesPLVP1(plotting HPIRG) Graph Created (12:18PM Mar 2, 2024)ObservedLatest observed value: 285.5 ft at 11:32 AM EST 2-Mar-2024.
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About this graph
Tabular Data (UTC)
Tabular Data (EST)
XML Data
RSS Files
Datum: Not Available
Metadata
NOTE: Forecasts are not available for the Tulpehocken Creek at Blue Marsh Dam. Only observed stages are available for this point.
Return to Area Map
Downstream Gauge Downstream Gauge - below Blue Marsh Dam
Flood Categories (in feet)
Major Flood Stage: 0
Moderate Flood Stage: 0
Flood Stage: 0
Action Stage: 307
Low Stage (in feet): -9999

Historic Crests
(1) 309.39 ft on 09/09/2011
(2) 309.19 ft on 06/28/2006

(P): Preliminary values subject to further review.

Recent Crests
(1) 309.39 ft on 09/09/2011
(2) 309.19 ft on 06/28/2006

(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.

Zoom Level:16
KML Image
Gauge LocationGauge Map Marker
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 Collapse
If you notice any errors in the below information, please contact our Webmaster
309 Rebers Bridge Road is subject to closures.
307 The level at which the reservoir begins to spill. The emergency spillway is an ungated, excavated channel located along the reservoir rim. Discharge through the emergency spillway is uncontrolled and intended to prevent overtopping and catastrophic failure of the dam during a high-water event. Significant flooding can occur during spillway flow. Please pay attention to your local authorities.
303 Route 183 floods between Mt. Pleasant and Bernville.
295 The beach at the Dry Brooks Day Use Center is subject to closure.
292 Boat launch ramps around the lake are subject to closure.
Photos
(1) Blue Marsh Dam & Gage
About This Location Collapse

Latitude: 40.379167° N, Longitude: 76.033056° W, Horizontal Datum: NAD83/WGS84

River Stage
Reference Frame
Gauge Height Flood Stage Uses
NWS stage 0 ft Not Available 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 Not Available Not Available Older USGS topographic maps, NGVD29 benchmarks
MSL Not Available Not Available Older USGS topographic maps, MSL benchmarks
Other 0 ft 307 ft  
Additional Information Collapse
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 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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Page last modified: 2-Nov-2020 7:30 PM
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