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Weather Forecast Office Philadelphia/Mount Holly, NJ

Middle Atlantic River Forecast Center

Hydrograph

River at a Glance

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Indian River near Indian River Inlet (IN MLLW)

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About this graph

Tabular Data (UTC)

Tabular Data (EDT)

Datum: Not Available

Metadata

NOTE: Please refer to our Coastal Hazard Message for specific information regarding Coastal Flood Watches, Warnings and Advisories. During tropical cyclones, please refer here for additional storm surge information.

NOTE: Flood impacts are based on long-term averages. Actual impacts from any tidal flooding event may vary due to factors such as rainfall, wave action, and the number of tide cycles during which there is an onshore flow.

NOTE: Graphical forecasts are not available for the Indian River near Indian River Inlet (IN MLLW). During times of high water, forecast crest information can be found in the text products.

Vertical Datum references a tidal datum (MLLW)...for more information see Tides and Currents .

Return to Area Map

Flood Categories (in feet)

Major Flood Stage:	6.2
Moderate Flood Stage:	5.2
Flood Stage:	4.2
Action Stage:	0
Low Stage (in feet):	-2

Historic Crests
(1) 7.66 ft on 10/29/2012
(2) 7.01 ft on 02/05/1998
(3) 6.99 ft on 11/13/2009
(4) 6.94 ft on 05/12/2008
(5) 6.81 ft on 01/25/2000
Show More Historic Crests

(P): Preliminary values subject to further review.

Recent Crests
(1) 5.26 ft on 04/04/2020
(2) 5.44 ft on 11/18/2019
(3) 5.75 ft on 10/11/2019
(4) 5.86 ft on 10/27/2018
(5) 5.72 ft on 09/09/2018
Show More Recent Crests

(P): Preliminary values subject to further review.

Low Water Records
Currently none available.

Zoom Level:16

	Gauge Location	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

If you notice any errors in the below information, please contact our Webmaster
7.66	(Mean Lower Low Water (MLLW)) The level reached on October 29, 2012 during Post Tropical Cyclone Sandy.
7.01	(MLLW) The level reached on February 5, 1998.
6.99	(MLLW) The level reached on November 13, 2009.
6.94	(MLLW) The level reached on May 12, 2008.
6.81	(MLLW) The level reached on January 25, 2000.
6.59	(MLLW) The level reached on January 23, 2016.
6.52	(MLLW) The level reached on October 18, 2009.
6.36	(MLLW) The level reached on October 31, 1991.
6.26	(MLLW) The level reached on March 6, 2013.
6.25	(MLLW) The level reached on December 12, 1992.
6.2	(MLLW) MAJOR FLOODING. At this level, flooding starts to become severe enough to begin causing structural damage along with widespread flooding of roadways near Rehoboth Bay, Indian River Bay and the tidal waterways that flow into them. Vulnerable homes and businesses may be severely damaged as water levels rise further above this threshold. Numerous roads become impassable and some neighborhoods may be isolated. The flood waters become a danger to anyone who attempts to cross on foot or in a vehicle.
5.2	(MLLW) MODERATE FLOODING. At this level, widespread flooding of roadways begins with many roads becoming impassable near Rehoboth Bay, Indian River Bay and the tidal waterways that flow into them. Lives may be at risk when people put themselves in harm's way. Some damage to vulnerable structures may begin to occur. COASTAL FLOOD WARNING LEVEL.
4.8	(MLLW) Flooding begins along Fred Hudson Road and Salt Pond Road (both are just north of Bethany Beach).
4.6	(MLLW) Flooding begins in Long Neck, including DE Route 23.
4.5	(MLLW) COASTAL FLOOD ADVISORY LEVEL.
4.4	(MLLW) Flooding begins along sections of DE Route 1 between Dewey Beach and Bethany Beach, including the Delaware Seashore State Park. Flooding begins in Bethany Beach.
4.2	(MLLW) MINOR FLOODING.

About This Location

Latitude: 38.609722° N, Longitude: 75.068056° W, Horizontal Datum: NAD83/WGS84

River Stage Reference Frame	Gauge Height	Flood Stage	Uses
NWS stage	0 ft	4.2 ft	Interpreting hydrographs and NWS watch, warnings, and forecasts, and inundation maps
Vertical Datum	Elevation (gauge height = 0)	Elevation (gauge height = flood stage)	Elevation information source
NAVD88	-1.93	2.27	Survey grade GPS equipment, FEMA flood plain maps, newer USGS topographic maps
NGVD 29	Not Available	Not Available	Older USGS topographic maps, NGVD29 benchmarks
MSL	Not Available	Not Available	Older USGS topographic maps, MSL benchmarks
Other	-1.21	1.06	NAVD88 to MHHW conversion from NOAA Vertical Datum Transformation (VDatum)

Current/Historical Observations:

U.S. Geological Survey (USGS) Data and Site Info for Indian River Inlet (IN MLLW)

Additional Information

All gage data is referenced in MLLW. During winter months, cold and ice may result in inaccurate real-time stages. Adjustments or deletions of this data can only be done after detailed analysis.

Resources

Hydrologic Resources

Additional Resources

Collaborative Agencies

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
Philadelphia/Mount Holly Weather Forecast Office
732 Woodlane Road
Mount Holly, NJ 08060-9615
(609) 261-6600
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Page last modified: 1-Mar-2019 12:35 AM

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