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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 Susquehanna River at Marietta are issued routinely year-round.
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Upstream Gauge - at Harrisburg Upstream Gauge
Zoom Level:13
Flood Categories (in feet)
Major Flood Stage: 54
Moderate Flood Stage: 52
Flood Stage: 49
Action Stage: 44
Low Stage (in feet): 0

Historic Crests
(1) 64.54 ft on 06/23/1972
(2) 60.73 ft on 03/19/1936
(3) 58.30 ft on 06/02/1889
(4) 58.16 ft on 09/09/2011
(5) 56.80 ft on 01/21/1996
Show More Historic Crests

(P): Preliminary values subject to further review.

Recent Crests
(1) 49.61 ft on 12/27/2020
(2) 50.93 ft on 07/26/2018
(3) 58.16 ft on 09/09/2011
(4) 51.15 ft on 04/29/2011
(5) 52.86 ft on 03/12/2011
Show More Recent Crests

(P): Preliminary values subject to further review.

Low Water Records
(1) 30.89 ft on 09/26/1932
(2) 31.23 ft on 09/27/1964
(3) 31.35 ft on 11/15/1964
(4) 31.43 ft on 09/04/1966
(5) 31.75 ft on 10/21/1980
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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
64 Widespread flooding on both banks affects homes, businesses, and the water and sewage plants.
59 Widespread flooding occurs on both sides of the river. Many homes and businesses are affected by high water. The Wrightsville water supply is affected by flood waters.
56 Widespread flooding occurs on both sides of the river. Many homes and businesses are affected.
54 Numerous homes and businesses in the Columbia and Wrightsville areas are affected by high water. The Wilton Company in Wrightsville experiences problems with high water.
52 A number of residences in the Wrightsville and Columbia areas begin to be affected.
49 Front Street in Wrightsville floods. Low lying areas of route 624 on the right, or west bank and along route 441 on the left, or east bank are also affected. Riverside recreation area is also inundated.
47 Low lying undeveloped areas on both banks are inundated. A couple of roadways are closed.
44 The right, or west bank overflows. Some roadways are affected.
(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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