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This probabilistic forecast is issued by the Middle Atlantic River Forecast Center.
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About this graph
Forecasts for the Swatara Creek at Harper Tavern are issued routinely year-round.
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Downstream Gauge Downstream Gauge - near Hershey
Zoom Level:16
Flood Categories (in feet)
Major Flood Stage: 15
Moderate Flood Stage: 12
Flood Stage: 9
Action Stage: 7
Low Stage (in feet): 0

Historic Crests
(1) 25.60 ft on 06/01/1889
(2) 24.60 ft on 09/08/2011
(3) 23.72 ft on 06/23/1972
(4) 18.28 ft on 06/29/2006
(5) 18.01 ft on 09/02/2021
Show More Historic Crests

(P): Preliminary values subject to further review.

Recent Crests
(1) 11.77 ft on 01/10/2024 (P)
(2) 12.01 ft on 12/19/2023 (P)
(3) 9.05 ft on 05/08/2022
(4) 9.96 ft on 02/04/2022
(5) 10.23 ft on 09/24/2021 (P)
Show More Recent Crests

(P): Preliminary values subject to further review.

Low Water Records
(1) -0.32 ft on 09/24/1980
(2) -0.30 ft on 09/04/1966
(3) -0.28 ft on 09/27/1964
(4) -0.25 ft on 10/01/1981
(5) -0.17 ft on 07/12/1975
Show More Low Water Records
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Gauge LocationGauge Map Marker
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
18 Widespread flooding occurs with many roads, homes and businesses affected.
16 Most homes adjacent to the creek are affected to some degree. Numerous evacuations are necessary.
14 A number of homes along the creek are affected. Some evacuations are necessary.
12 A number of secondary roads are closed, resulting in some evacuations. A few homes are flooded.
10 High water isolates several houses.
9 Several driveways and other minor roadways are affected. Water begins to enter some basements.
(1) looking upstream
(2) view of the gagehouse
(3) looking downstream

Other Real-time and/or Archive Data Sources:

Additional Information Collapse
Potential River Levels - Used to
Potential River Levels
Used to Estimate the Chance of Flooding and the Range of Possible River Levels
10 Day (HEFS) 7 Day (NAEFS) 7 Day (GEFS)
HEFS Ensemble NAEFS Ensemble GEFS Ensemble

Note: Use the official hydrograph at the top of this web page for river levels within the next 72 hours.

Click individual graphics to enlarge.

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
State College Weather Forecast Office
328 Innovation Boulevard, Suite 330
State College, PA 16803
(814) 954-6400
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Page last modified: 2-Nov-2020 7:30 PM
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