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Susquehanna River at Danville, PA (DANP1)


Data Type




Inundation Levels
NAVD88 Stage

467.4*36.9*
466.5*36.0*
465.7*35.2*
465.0*34.5*
463.5*33.0*
Record Crest: 32.32 ft
462.031.5

Major Flooding Begins

460.530.0
459.829.3
458.628.1
457.627.1
456.726.2
455.424.9
454.724.2

Moderate Flooding Begins

453.523.0
452.421.9
451.320.8

Minor Flooding Begins

450.019.5
448.818.3
447.116.6

Near Flooding Begins

444.914.4

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:
2.9 ft at 09/18/2019 21:30:00 UTC
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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: 30
Moderate Flood Stage: 23
Flood Stage: 20
Action Stage: 15
Low Stage (in feet): 0

Historic Crests
(1) 32.32 ft on 06/24/1972
(2) 31.55 ft on 09/09/2011
(3) 30.71 ft on 03/09/1904
(4) 28.19 ft on 06/28/2006
(5) 28.01 ft on 03/19/1936
Show More Historic Crests

(P): Preliminary values subject to further review.

Recent Crests
(1) 22.29 ft on 08/16/2018
(2) 31.55 ft on 09/09/2011
(3) 22.41 ft on 04/29/2011
(4) 22.57 ft on 03/12/2011
(5) 28.19 ft on 06/28/2006
Show More Recent Crests

(P): Preliminary values subject to further review.

Low Water Records
(1) 1.51 ft on 09/27/1964
(2) 1.60 ft on 09/25/1900
(3) 1.60 ft on 09/27/1939
(4) 1.70 ft on 09/19/1908

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.

Danville Flood Risk Management (FRM) System (red lines) – At the time these maps were developed (2017), the FRM system was shown as accredited by FEMA on their Flood Insurance Rate Maps, however, it may be freeboard deficient (not have the required height) and more analysis is required.  At the request of Montour County, the FRM system is shown on these maps as reducing the flood risk to the area behind it until the system is overtopped.  There is a risk that the FRM project may fail prior to being overtopped.

Danville Flood Risk Management Risk Area (yellow shaded area) – Shows areas with flood risk reduced by the Danville FRM system.  If the FRM system fails due to any deficiencies, this is the area that would flood.

Mahoning Creek Flood Risk Management (FRM) System (red lines) – At the time these maps were developed (2017), the FRM system needed repair work.  The PA Department of Environmental Protection was working towards designing and constructing improvements to the system. At the request of Montour County, the FRM system is shown on these maps as reducting the flood risk to the area behind it until the system is overtopped.  There is a risk that the FRM project may fail prior to being overtopped.

Mahoning Creek Levee Risk Area (yellow shaded area) - Shows areas with flood risk reduced by the Mahoning Creek FRM system.  If the levee system fails due to any deficiencies, this is the area that would flood.

The detailed project report can be found here

If you have questions related to any of the flood risk management projects in Montour County, call Ed Burkland, Montour County Emergency Management Agency, at (570) 271-3047.

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
41.5 Flood waters begin to reach the Rupert Drive Bridge in Catawissa.
38 FEMA 0.2% Annual Chance Flood Level (500-year flood).
34 Levee system on the right bank begins to overflow. Widespread flooding continues in unprotected areas. Low lying areas within the levee system begin to be affected.
32.3 Flood of record from Hurricane Agnes in 1972.
32 Areas outside of the levee system experiences widespread flooding. The levee system protects most of Danville to a height of 34 feet.
31.5 FEMA 1% Annual Chance Flood Level (100-year flood).
30.5 Flood waters begin to reach the Danville Riverside Bridge.
30 Much of riverside on the left bank is affected by high water. Water levels approach the pump station on the right bank just downstream of the highway bridge.
29 FEMA 2% Annual Chance Flood Level (50-year flood).
24.5 FEMA 10% Annual Chance Flood Level (10-year flood). Flood waters begin to affects residences in riverside on the left bank of the river.
24 Inundation in riverside on the left bank of the river begins to affect residences.
23 Flooding occurs at the state hospital grounds on the east side of town. Backwater produces flooding on Sechler Run in the center of town.
21 Basements flood in homes along Mahoning Creek on the right bank of the river.
20 Inundation begins in Riverside on the left bank.
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: 5-Mar-2019 5:40 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.