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This probabilistic forecast is issued by the Middle Atlantic River Forecast Center.
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Mapping		 tab right off tab left on tab right on
About this graph
Forecasts for the Susquehanna River at Harrisburg are issued routinely year-round.
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Upstream Gauge - at Sunbury Upstream Gauge Downstream Gauge Downstream Gauge - at Marietta
Zoom Level:13
Flood Categories (in feet)
Major Flood Stage: 23
Moderate Flood Stage: 20
Flood Stage: 17
Action Stage: 11
Low Stage (in feet): 0

Historic Crests
(1) 33.27 ft on 06/24/1972
(2) 29.23 ft on 03/19/1936
(3) 26.80 ft on 06/02/1889
(4) 25.70 ft on 05/22/1894
(5) 25.17 ft on 09/09/2011
Show More Historic Crests

(P): Preliminary values subject to further review.

Recent Crests
(1) 17.32 ft on 07/26/2018
(2) 25.17 ft on 09/09/2011
(3) 18.39 ft on 04/29/2011
(4) 20.09 ft on 03/12/2011
(5) 19.66 ft on 06/29/2006
Show More Recent Crests

(P): Preliminary values subject to further review.

Low Water Records
(1) 1.83 ft on 09/13/1964
(2) 2.46 ft on 09/25/1963
(3) 2.48 ft on 11/29/1930
(4) 2.59 ft on 09/28/1959
(5) 2.67 ft on 11/06/1964
Show More Low Water Records
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
37 FEMA 0.2% Annual Chance Flood Level (500-year flood).
35 Flood waters begin to reach the Harvey Taylor Bridge.
33.3 Flood of record from Hurricane Agnes in 1972.
32 Widespread flooding occurs on both banks. The square and central business district in Harrisburg begin to be affected.
30 Widespread flooding occurs on both banks.
29 FEMA 1% Annual Chance Flood Level (100-year flood). Flood waters begin to reach the Market Street Bridge.
28 Widespread flooding occurs in the residential sections of Front and Second Streets and in the Shipoke area of Harrisburg. Flooding reaches Italian Lake Park in Harrisburg.
26 FEMA 2% Annual Chance Flood Level (50-year flood). Flood waters begin to reach the Walnut Street Bridge. Green and Vaughn Streets flood.
24 The residential section of Front and Second Streets in Harrisburg flood at this level. Cameron Street in Harrisburg floods due to backwater from Paxton Creek.
23 Evacuations are necessary in the Shipoke area of Harrisburg. Listen to local emergency officials for specific details. The water level reaches the corner of Keller and Front Streets. Delaware Street, Geiger Street and Maclay Streets may also be impacted.
22.5 US 22/322 in the vicinity of the Dauphin Narrows is impacted by flood waters.
21 Homes on both banks are affected by high water. This is the approximate level of Routes 11 and 15, upstream of the Market Street Bridge. Flood waters begin to reach South Main Street in Marysville.
20.5 FEMA 10% Annual Chance Flood Level (10-year flood).
20 Riverfront Park in Harrisburgh begins to flood.
19 A number of homes in West Fairview, Dauphin, and Harrisburg flood. Flood waters begin to reach Front Street in East Pennsboro Township in Cumberland County.
17 Basements of residences and businesses on both banks flood. The parking lot on City Island begins to take on water.
15 The recreation area of City Island is evacuated. River interests are encouraged to monitor conditions.
13 The recreation area on City Island is evacuated. River interests are encouraged to monitor conditions.
11 Recreational use of City Island begins to be curtailed. River interests are encouraged to monitor conditions.
Photos
(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
3 Day (SREF) 7 Day (NAEFS) 7 Day (GEFS)
SREF Ensemble NAEFS Ensemble  GEFS Ensemble 

Note: Use the official hydrograph at the top of this web page for river levels within the next 48 hours.

See the Product Description Document link for more details on the interpretation of the 3,7 day graphics. 

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) 231-2408
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