Major Flood
5.3 ft
Current Water Level
Gage Height
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Streamflow
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Last Reading
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FLOOD STAGES
Know the flood categories.
Flood stages defined by the National Weather Service. Gage height data from USGS Water Resources.
Moderate Flood
4.3 ft
Minor Flood
3.3 ft
What Floods at Each Level
7.34 ft
(Mean Lower Low Water (MLLW)) The level reached on March 6, 1962.
5.73 ft
(MLLW) The level reached on October 29, 2021.
5.68 ft
(MLLW) The level reached on October 29, 2012 during Post Tropical Cyclone Sandy.
5.3 ft
(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 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.
4.3 ft
(MLLW) MODERATE FLOODING. At this level, widespread flooding of roadways begins with many roads becoming impassable near Rehoboth 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 structures may begin to occur. COASTAL FLOOD WARNING LEVEL.
3.6 ft
(MLLW) COASTAL FLOOD ADVISORY LEVEL.
3.5 ft
(MLLW) Flooding begins at Old Landing on Rehoboth Bay. Flooding begins along sections of DE Route 1 between Dewey Beach and Indian River Inlet, including the Delaware Seashore State Park. Flooding begins in Dewey Beach.
3.3 ft
(MLLW) MINOR FLOODING.
Impact statements from the National Weather Service, describing what typically happens at each water level.
7-Day Water Level Chart
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Historic Crests
| Date | Stage | Flow |
|---|---|---|
| Mar 5, 1962 | 7.34 ft | — |
| Oct 28, 2021 | 5.73 ft | — |
| Oct 28, 2012 | 5.68 ft | — |
About This Gauge
Get Flood Alerts for Rehoboth Bay
StormCast monitors this gauge and sends a push notification to your phone when the water level crosses into a new flood category — even at 3 AM.
Frequently Asked Questions
What is the current water level of Rehoboth Bay at Dewey Beach (IN MLLW)?
The Rehoboth Bay at Dewey Beach (IN MLLW) gauge is maintained by USGS (site 01484670) and reports water levels every 15 minutes. Visit this page to see the latest reading updated live, or download StormCast to get push alerts when levels rise.
What is flood stage for Rehoboth Bay at Dewey Beach (IN MLLW)?
The NWS-defined flood stage for Rehoboth Bay at Dewey Beach (IN MLLW) is 3.3 feet. Action stage begins at N/A feet. Moderate flooding starts at 4.3 feet, and major flooding at 5.3 feet.
How do I get alerts when Rehoboth Bay rises?
Download StormCast free on Google Play, go to River Gauges, and add Rehoboth Bay at Dewey Beach (IN MLLW) to your watchlist. StormCast will send a push notification to your phone whenever the water level crosses into a new NWS flood category.
Where is the Rehoboth Bay at Dewey Beach (IN MLLW) gauge located?
The gauge is located in Sussex County, Delaware at coordinates 38.6902°N, 75.0785°W. USGS site number: 01484670. Data is provided by the U.S. Geological Survey and the National Weather Service.
More Resources
Source & Notes
Data provided by: US Geological Survey, Observations courtesy of U.S. Geological Survey
- <style type="text/css"> .style1 {background-color: #FFFF00;}</style>Please refer to our <style type="text/css"> .style1 { background-color: #FFFF00;} .style2 {background-color: #FFFF00;} </style> <a href="http://forecast.weather.gov/product.php?site=NWS&issuedby=PHI&product=CFW&format=CI&version=1&glossary=0"> <span class="style1">Coastal Hazard Message</span></a> for specific information regarding Coastal Flood Watches, Warnings and Advisories. During tropical cyclones, please refer<a href="https://forecast.weather.gov/product.php?site=NWS&issuedby=PHI&product=TCV&format=CI&version=1&glossary=1"> <span class="style2">here</span></a> for additional storm surge information.
- 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.