Historical Delaware Flood Data

This is some historical flood data from Weather.gov .  You can tell at what tide heights certain areas flood from this data collected since 1919 from the Lewes tide guage.

Lewes Tide today and Saturday

01/22 Fri 12:33 AM -0.49 L
01/22 Fri 07:13 AM 4.87 H
01/22 Fri 01:28 PM -0.41 L
01/22 Fri 07:37 PM 3.8 H
01/23 Sat 01:23 AM -0.54 L
01/23 Sat 07:59 AM 4.91 H
01/23 Sat 02:13 PM -0.47 L
01/23 Sat 08:22 PM 3.86 H

 

REFERENCE TIDE GAUGE – LEWES

 

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The Broadkill River below, meeting Canary creek, the Rehoboth/Lewes canal and Roosevelt inlet that empties into the Delaware Bay ... photo by Amy Conroy
The Broadkill River below, meeting Canary creek, the Rehoboth/Lewes canal and Roosevelt inlet that empties into the Delaware Bay … photo by Amy Conroy

The Lewes tide gauge is located on the bay side of Cape Henlopen in Breakwater Harbor.
Delaware Bay
For the Delaware Bay shoreline in Sussex County, high tides occur about 25 minutes
later at the Mispillion River (the north end of the county) than at the Lewes gauge. Low
tides occur around 50 minutes later.
Oceanfront
The high and low tides on the oceanfront occur up to around 1 hour earlier than the high
and low tides at the Lewes gauge.
Back bays/Inland Bays

Lewes Tide chart
Lewes Tide chart

The back bays of Sussex County are Rehoboth Bay and Indian River Bay (both of which
drain through the narrow Indian River Inlet), and Little Bay and Little Assawoman Bay
(both of which drain into Maryland’s Assawoman Bay to the south).
High tides on the back bays of Sussex County occur up to about 2½ hours later than the
high tides at the Lewes gauge. Low tides occur up to about 3 hours later.
The back bays present a problem during prolonged periods of onshore flow. For each
successive tide cycle that the back bays are not allowed to drain, the water levels
increase.
Data Acquisition
In order to access data from the Lewes gauge, use the National Ocean Service web site at
http://tidesonline.nos.noaa.gov/ or the Advanced Hydrologic Prediction Service site at
http://water.weather.gov/ahps2/index.php?wfo=phi.
REFERENCE TIDE GAUGE – LEWES
The tide heights from actual events referenced in the following table are those that were
verified by the National Ocean Service.
In the table an asterisk (*) indicates that location experiences back bay type flooding.
Being that the reference gauge is on Delaware Bay, the tide level associated with that
particular location may vary somewhat from event to event based on the number of tide
cycles during which there is an onshore flow.
THE PERIOD OF RECORD FOR THE LEWES GAUGE BEGINS IN JANUARY 1919.
PLEASE NOTE THAT THERE ARE GAPS WITHIN THE PERIOD OF RECORD
DUE TO EQUIPMENT OUTAGES AND/OR DATA AVAILABILITY.
ALL HEIGHTS ARE IN MEAN LOWER LOW WATER (MLLW).
9.2 FT — March 6, 1962.
8.8 FT — January 4, 1992.
8.7 FT — October 29, 2012 (Post Tropical Cyclone Sandy).
8.6 FT — January 28, 1998.
8.5 FT — February 5, 1998.
8.0 FT — MAJOR TIDAL FLOODING BEGINS.
September 27, 1985 (Hurricane Gloria) / March 3, 1994 / August 27, 2011
(Hurricane Irene).
7.9 FT — October 25, 1980 / March 29, 1984.
7.8 FT — December 12, 1992 / January 7, 1996 / November 13, 2009.
7.7 FT — May 12, 2008 / October 29, 2011.
7.6 FT — October 22, 1961 / October 14, 1977 / February 17, 2003.
7.5 FT — October 31, 1991.
7.4 FT — September 18, 1936 (Hurricane) / November 3, 1962 /
December 22, 1972 / January 2, 1987 / November 14, 1997 /
January 25, 2000 / October 7, 2006.
7.3 FT — December 9, 1973 / October 8, 1996 / October 17, 2009 / June 4, 2012 /
March 6, 2013.
7.2 FT — January 13, 1964 / September 25, 1992 (Tropical Storm Danielle) /
May 25, 2005.
7.1 FT — November 10, 1969 / January 31, 2006 / December 19, 2009 /
December 9, 2014.
7.0 FT — MODERATE TIDAL FLOODING BEGINS.
November 1, 1947 / February 26, 1979 / November 15, 1981 /
December 2, 1986 / October 19, 1989 / January 3, 2003.
6.8 FT — Flooding occurs in Milford along the Mispillion River.
Flooding begins in Broadkill Beach, including DE Route 16.
Flooding occurs in Rehoboth Beach along Surf Avenue and along the
Boardwalk.
Flooding occurs in Millsboro.
6.6 FT — Flooding occurs along Sussex County Route 360 and Salt Pond Road*
(both are just north of Bethany Beach).
6.4 FT — Flooding begins around the Mispillion Light.
Flooding begins in Slaughter Beach.
Flooding begins in Primehook Beach and along Primehook Road.
Flooding occurs along Cedar Street in Lewes.
Flooding occurs along US Route 9 in Lewes in the vicinity of the Lewes
and Rehoboth Canal.
Flooding begins in Oak Orchard, including Sussex County Route 312*.
Flooding begins in Long Neck, including DE Route 23*.
6.3 FT — COASTAL FLOOD ADVISORY THRESHOLD.
6.2 FT — Flooding occurs at Old Landing on Rehoboth Bay*.
Flooding occurs along sections of DE Route 1 between Dewey Beach and
Bethany Beach, including the Delaware Seashore State Park*.
Flooding begins in Dewey Beach*, Bethany Beach and South Bethany*.
Flooding begins in Fenwick Island*, including DE Route 54.
6.0 FT — MINOR TIDAL FLOODING BEGINS.
-2.0 FT — LOW WATER ADVISORY THRESHOLD.
-3.0 FT — December 8, 1939 / March 5, 1954 / December 31, 1962 /
December 22, 1976 / January 11, 1977 / December 10, 1977.
-3.1 FT — January 25, 1939 / November 30, 1958 / January 28, 1963.
-3.2 FT — January 6, 1959 / March 16, 1980.
-3.4 FT — January 28, 1971.
-4.2 FT — January 10, 1978

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