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Susquehanna River at Sunbury, PA (SBYP1)


Data Type




Inundation Levels
NAVD88 Stage

449.2*41.4*
448.4*40.6*
447.7*39.9*
447.0*39.2*
446.3*38.5*
445.6*37.8*
444.5*36.7*
Record Crest: 35.8 ft
443.235.4

Major Flooding Begins

441.834.0
440.732.9
440.332.5
439.731.9
438.330.5
437.629.8
436.328.5
435.227.4
434.226.4

Moderate Flooding Begins

432.825.0
432.024.2

Minor Flooding Begins

431.323.5
429.922.1
429.221.4
428.921.1

Near Flooding Begins

427.719.9

Below Flooding Begins

* = Extended rating
Weather Forecast Office State College, PA Middle Atlantic River Forecast Center
Hydrograph River at a Glance Download Inundation
Mapping
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Click on mapped inundation to see water depth values for that location, or hold shift and drag to zoom to area.

Current Stage:
9.0 ft at 11/15/2019 06:45:00 UTC
Selected Inundation
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Inundation Legend
Depth in feet
USGS Gauge Location Gauge Location
What is UTC time? Map Help

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.

Gauge Information Collapse

Map Overlays

Flood Categories (in feet)
Major Flood Stage: 34
Moderate Flood Stage: 26
Flood Stage: 24
Action Stage: 20
Low Stage (in feet): 0

Historic Crests
(1) 35.80 ft on 06/24/1972
(2) 31.66 ft on 09/09/2011
(3) 30.62 ft on 09/27/1975
(4) 30.44 ft on 09/19/2004
(5) 30.32 ft on 01/20/1996
Show More Historic Crests

(P): Preliminary values subject to further review.

Recent Crests
(1) 21.17 ft on 09/12/2018
(2) 21.73 ft on 08/15/2018
(3) 22.16 ft on 07/26/2018
(4) 31.66 ft on 09/09/2011
(5) 25.58 ft on 04/29/2011
Show More Recent Crests

(P): Preliminary values subject to further review.

Low Water Records
(1) 4.83 ft on 10/16/1971
(2) 5.16 ft on 08/06/1983
(3) 5.60 ft on 09/30/1980

Graphical representation of flood inundation for NWS flood categories are based on steady state hydraulic modeling of water surface elevations for incremented discharges. Map shows approximate inundation areas for given water surface elevations and should not be used for navigation or permitting or other legal purposes, but strictly as a planning reference tool.

Site-specific information:

The purpose of a flood forecast inundation map is to communicate flood risk based on best available information at the time of map development. This flood forecast inundation map has been compiled using the best information available and is believed to be accurate; however, its preparation required many assumptions. Actual conditions during a flood event may vary from those modeled in the map. The limits of flooding shown should only be used as a guideline for emergency planning and response actions. Actual areas inundated will depend on specific flooding conditions.

The risk of flooding behind flood risk management (FRM) structures (such as levees, floodwalls, closures, etc.) depends on many factors that cannot be entirely predicted in advance. These factors include whether the FRM structure overtops, length of time the structure overtops, and whether the overtopping leads to breach formation.

The mapping is based on the PASDA ground elevation data from 2006-2008.

Flood Risk Management Structures (red lines) – Includes Sunbury FRM project.  Area behind the FRM structures is not shown as being flooded until the structure is over-topped.

Flood Risk Management Risk Area (yellow shaded area) - Shows the area with flood risk reduced by documented flood risk management structures

The detailed project report can be found here

If you have questions related to the flood risk management/levee projects in Northumberland County, contact Keith Ayers, Northumberland County, keith.ayers@norrycopa.net, phone: 570-988-4294.

Extended rating:
Rating Curve Extension - The Rating Curve Extension is calculated by using either a linear, logarithmic, or hydraulic technique to extend the rating curve above the currently established relationship between stage and flow.

Flood Impacts Collapse
If you notice any errors in the below information, please contact our Webmaster
35 Widespread catastrophic flooding occurs in areas outside the flood wall and levee system. This is the design height of the flood protection works anround Sunbury.
34 Most areas adjacent to the river, which are not protected by the flood wall and levee system, are affected by high water. Catasrophic flooding occurs in some of these areas.
32 Widespread flooding occurs in areas not protected by the flood wall and levee system. Many homes and businesses are affected.
30 Widespread flooding occurs in areas not protected by the flood wall and levee system. Many homes and businesses are affected.
28 Widespread flooding occurs in areas not protected by the flood wall and levee system. Many homes and businesses are affected.
26 High water affects a number of homes and businesses in areas not protected by the flood wall and levee system.
24 Both banks overflow. Areas not protected by the flood wall and levee system are affected.
22 River interests are encouraged to monitor conditions for further rises.
20 River interests are encouraged to monitor conditions for further rises. Shilellimy State Park closed due to high water.
Photos
(1) looking upstream
(2) view of the gagehouse
(3) looking downstream
Other Data Sources Collapse
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.

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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.
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Page last modified: 7-Nov-2019 3:38 PM
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Graphical representation of flood inundation for NWS flood categories are based on steady state hydraulic modeling of water surface elevations for incremented discharges. Map shows approximate inundation areas for given water surface elevations and should not be used for navigation or permitting or other legal purposes, but strictly as a planning reference tool.