National Weather Service Advanced Hydrologic Prediction Service

By inergency On Mar 29, 2024

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Indian River at Rosedale Beach (IN MLLW)

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 at Rosedale Beach (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 .

Flood Categories (in feet)

Major Flood Stage:	6.5
Moderate Flood Stage:	5.5
Flood Stage:	4.5
Action Stage:	0
Low Stage (in feet):	-2

Historic Crests
(1) 7.71 ft on 02/05/1998
(2) 7.20 ft on 01/23/2016
(3) 6.95 ft on 10/29/2012
(4) 6.76 ft on 11/12/2009
(5) 6.48 ft on 03/06/2013
Show More Historic Crests

(P): Preliminary values subject to further review.

Recent Crests
(1) 6.09 ft on 09/23/2023
(2) 5.74 ft on 06/03/2023
(3) 6.14 ft on 05/08/2022
(4) 5.50 ft on 01/03/2022
(5) 6.37 ft on 10/29/2021
Show More Recent Crests

(P): Preliminary values subject to further review.

Low Water Records
Currently none available.

	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.

If you notice any errors in the below information, please contact our Webmaster
7.71	(Mean Lower Low Water (MLLW)) The level reached on February 5, 1998.
7.2	(MLLW) The level reached on January 23, 2016.
6.95	(MLLW) The level reached on October 29, 2012 during Post Tropical Cyclone Sandy.
6.76	(MLLW) The level reached on November 12, 2009.
6.5	(MLLW) MAJOR FLOODING. At this level, flooding starts to become severe enough to begin causing structural damage along with widespread flooding of roadways near Indian River Bay and the tidal waterways that flow into it. 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.
5.5	(MLLW) MODERATE FLOODING. At this level, widespread flooding of roadways begins with many roads becoming impassable near Indian River Bay and the tidal waterways that flow into it. Lives may be at risk when people put themselves in harm’s way. Some damage to vulnerable strucures may begin to occur. COASTAL FLOOD WARNING LEVEL.
5.3	(MLLW) Flooding begins in Millsboro.
4.9	(MLLW) Flooding begins in Oak Orchard, including River Road.
4.8	(MLLW) COASTAL FLOOD ADVISORY LEVEL.
4.5	(MLLW) MINOR FLOODING.

Latitude: 38.591500° N,
Longitude: 75.211600° W,
Horizontal Datum:
NAD83/WGS84

River Stage Reference Frame	Gauge Height	Flood Stage	Uses
NWS stage	0 ft	4.5 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	-1.50	3.0	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	-0.94	2.06	NAVD88 to MHHW conversion from NOAA Vertical Datum Transformation (VDatum)

Current/Historical Observations:

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.

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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