Tidora

Rehoboth Bay at Dewey Beach (IN MLLW)

National Weather Service gauge DEWD1 · Delaware · Sussex County · 38.6902, -75.0785 · USGS 01484670

Stage at this gauge is reported IN MLLW.

Flood levels

Official flood levels at this gauge: minor flooding begins at 3.3 ft; moderate flooding begins at 4.3 ft; major flooding begins at 5.3 ft.

Minor flooding3.3 ft
Moderate flooding4.3 ft
Major flooding5.3 ft

Highest recorded crests

What the water does

National Weather Service impact statements for this gauge, in the Weather Service's own words.

3.3 ft(MLLW) MINOR FLOODING.
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.
3.6 ft(MLLW) COASTAL FLOOD ADVISORY LEVEL.
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.
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.
5.7 ft(MLLW) The level reached on October 29, 2012 during Post Tropical Cyclone Sandy.
5.7 ft(MLLW) The level reached on October 29, 2021.
7.3 ft(Mean Lower Low Water (MLLW)) The level reached on March 6, 1962.

Forecast office: NWS Mount Holly · River Forecast Center: Middle Atlantic River Forecast Center.

Tidora wave T logo

Rehoboth Bay at Dewey Beach (IN MLLW) in your pocket

Tidora puts this spot on your Home Screen and Lock Screen with free widgets, and sends free flood alerts before the water reaches the levels that matter to you. No account, no subscription needed for either.

Download Tidora on the App Store

Tidora is preparing for launch; these pages go fully live when the app ships.

Nearby stations and gauges