2006 Mid-Atlantic United States flood
|Date||June 25–July 5|
|Location||Delaware, Maryland, New Jersey, New York, Pennsylvania, Virginia, Washington, DC|
|Property damage||$1 billion|
The Mid-Atlantic United States flood of 2006 was a significant flood that affected much of the Mid-Atlantic region of the eastern United States. The flooding was very widespread, affecting numerous rivers, lakes and communities from upstate New York to North Carolina. It was widely considered to be the worst flooding in the region since Hurricane David in 1979. It was also one of the worst floodings in the United States since Hurricane Katrina in August 2005. At least 16 deaths were related to the flooding.
The flooding was attributed to several weather factors that all came together over the region.
The primary factor was the stalling of the jet stream just to the west of the Appalachian Mountains. That, combined with the Bermuda High over the Atlantic Ocean, blocked any systems from moving inland or offshore. The influence of a tropical low (which nearly became a tropical storm but did not attain a full surface circulation) off the North Carolina coast allowed a constant stream of tropical moisture to enter the Mid-Atlantic region. The resulting heavy and prolonged rains overflowed the banks of many rivers, lakes, and streams, leading to the flooding.
Considerable flooding occurred in much of Delaware, particularly in Sussex County, where Governor Ruth Ann Minner declared a state of emergency. The hardest hit community was Seaford, where 40 families were temporarily homeless and many homes and businesses were damaged.
District of Columbia
Significant street and river flooding was reported in Washington, D.C. Several important federal buildings, including the National Archives and Records Administration, the Internal Revenue Service, the United States Department of Justice and some of the Smithsonian Institution, were closed.
Sections of Beach Drive in Rock Creek Park were washed out. The road was closed for several months for repair and reinforcing. Beach Drive is the main north-south road through the park and is a major commuter artery.
The most severe flooding took place in and around Montgomery County. Over 2,200 people had to be evacuated from the area south of Lake Needwood in Rockville due to concerns of a dam break there (the earthen dam was leaking). If the dam were to break, communities downstream could be under as much as 22 feet (6.7 m) of flood water. The dam did not break, however, and the evacuations ended on the evening of June 29. U.S. Route 29 (Colesville Road) in Silver Spring and Maryland Route 198 near Fort Meade were among the dozens of roadways closed due to high water. Parts of Laurel in Prince George's County were also evacuated after floodgates were opened to relieve pressure on a nearby dam.
In Frederick County, three people were killed when they attempted to cross the flood waters from Middle Creek. Also in Frederick County, a 14-year-old boy and a 16-year-old boy drowned while swimming in a swollen creek that feeds into the Monocacy River. On July 4 in Prince George's County, the body of a 22-year-old man was recovered. It was determined that his car was swept off U.S. 29 by the floodwaters nearly two weeks prior.
On Friday, June 30, Maryland Governor Robert Ehrlich requested federal disaster aid for five Maryland counties: Caroline, Cecil, Dorchester, Harford, and Montgomery. However, Ehrlich stated in a letter requesting the aid to President George W. Bush that more counties could be included after damage assessments. Governor Ehrlich stated that damages in Maryland could exceed $10 million. Ehrlich also requested, in addition to federal disaster aid, funds for "hazard mitigation assistance", which is federal money used to help governments rebuild antiquated structures with modern structures. Ehrlich also obtained loans from the federal Small Business Administration to help private property owners, both residential and business, to rebuild or repair damaged buildings.
The heaviest flooding in New Jersey was along and near the Delaware River, on the border with Pennsylvania. Over 1,000 people were evacuated from low-lying areas of Trenton, and some state government buildings were closed.
In addition, Trenton's water filtration system was shut down because of debris floating down the Delaware, and Mayor Douglas Palmer called for conservation, saying the city had only about two days of drinkable water.
The river was expected to crest Friday at nearly 8 feet (2.4 m) over flood stage, the fourth-highest level on record for Trenton.
Significant flooding took place in the Southern Tier region, particularly around Binghamton and Waverly/Sayre (on the New York-Pennsylvania border). Riverside communities were severely flooded, and many evacuations took place in the region which stretched along the Susquehanna, Chenango, Delaware and Unadilla rivers. The Susquehanna River in Bainbridge crested at 27 feet (8.2 m), 14 feet (4.3 m) over the flood stage. This was the highest the river had ever reached in the Bainbridge area. In Broome County alone, over 5,000 people were forced to evacuate, particularly in the submerged town of Conklin.
In Port Jervis, the Delaware River flooded low areas of the city that had barely recovered from the record flooding of April 2005. The Neversink River also swelled, prompting officials to close the Neversink bridge. The Mid-Delaware Bridge (carrying US 6 and 209) was also closed.
Governor George Pataki estimated that damage in the state could exceed $100 million. Many of the records levels during this flood would be topped five years later in 2011 when the remnants of Tropical Storm Lee struck the area.
The worst flooding in the state took place in the Susquehanna River valley and its tributaries. Over 200,000 residents in northeastern Pennsylvania had to be evacuated due to the rising floodwaters. Damage in Susquehanna County alone totaled over $100 million (2006 USD).
Extensive river flooding was reported in dozens of communities in eastern Pennsylvania. Over 70 people had to be rescued from rooftops by U.S. Coast Guard helicopters after being stranded by the floodwaters.
At the Wilkes-Barre flood protection levee, the river was at 41 feet (12 m), which was about the record level reached in Hurricane Agnes and at which point catastrophic flooding takes place. Forecasts predicted that the river would crest at above 39 feet (12 m), exceeding any other event other than Agnes and leading to significant flooding in other communities with less protection. Luzerne County officials said the large evacuations were precautionary, as there was a potential for the area to be isolated if the most severe predictions took hold.
In Easton, the Delaware River crested at 17 feet (5.2 m) above flood stage. At Riegelsville, the river was at 14 feet (4.3 m) above flood level, and at New Hope it crested at 8 feet (2.4 m) above flood level.
In Harrisburg, a festival's start in the city was pushed back and cut down, due to the potential for the flood, and the Harrisburg Senators were forced to play 2 "home games" in Bowie, Maryland, due to flooding in Commerce Bank Park.
Severe flooding of Swatara Creek near Hershey and Hummelstown closed many roads in the area and damaged a number of homes. The creek crested at 16.12 feet (4.91 m) around 7 am on June 29, breaking the previous official record of 15.37 feet (4.68 m), which was set September 27, 1975. However, this did not come close to the flooding after Hurricane Agnes, which caused the creek to crest at approximately 28 feet (8.5 m) on June 23, 1972. Hummelstown was flooded briefly (3–4 days), mainly across Duke and Water streets, as well as the railroad tracks.
In Pike County, the Delaware River caused extensive damage to Matamoras Borough and Westfall Township. The Delaware crested in the early hours of 29 June at 32.16 feet (9.80 m) at Milford (as per NOAA hydrograph ) The record level of the river at Milford is 35.5 feet (10.8 m), and flood stage is 25 feet (7.6 m).
In Wayne County, the opening of the Lake Wallenpaupack spillway caused damage downstream. The Delaware River also caused damage on the eastern border of the county. Damage in Wayne County totaled about $50 million (2006 USD).
Of the 67 counties in Pennsylvania, 46 were under a state of emergency as declared by Governor Ed Rendell. Four deaths were confirmed in Pennsylvania; two in Luzerne County, one near Gettysburg, and one in rural Wayne County.
Flooding occurred in many areas in Virginia, particularly in the north. A mudslide closed the Capital Beltway in Alexandria for several hours on Monday, June 26. Mudslides were also witnessed in the mountainous regions.
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