Delaware River at Marcus Hook (IN MLLW)

The past week

What floods at each level

• 10.14 ft

  (Mean Lower Low Water (MLLW)) The level reached on October 30, 2012 during Post Tropical Cyclone Sandy.

• 9.76 ft

  (MLLW) The level reached on April 16, 2011.

• 9.75 ft

  (MLLW) The level reached on December 21, 2012.

• 9.72 ft

  (MLLW) The level reached on October 29, 2021.

• 9.7 ft

  (MLLW) MAJOR FLOODING. At this level, widespread roadway flooding begins near the river and its tidal tributaries in Delaware County, Pennsylvania and Gloucester County, New Jersey. Vulnerable homes and businesses may be 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.

• 8.7 ft

  (MLLW) MODERATE FLOODING. At this level, additional roadways near the river and its tidal tributaries in Delaware County, Pennsylvania and Gloucester County, New Jersey begin to flood. 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.

• 8.5 ft

  (MLLW) Flooding begins in Tinicum Township PA between Philadelphia International Airport and Essington, and along the lower Darby Creek.

• 8.3 ft

  (MLLW) Flooding begins along the Nehonsey Brook in Gibbstown (Greenwich Township) NJ at South Poplar Street and Democrat Road.

• 8.1 ft

  (MLLW) Flooding begins along Mantua Creek in Gloucester County NJ. Flooding begins along Island Road, High Hill Road, Center Square Road and Pedricktown Road in Logan Township NJ. Flooding begins along US 130 at Oldmans Creek.

• 8 ft

  (MLLW) COASTAL FLOOD ADVISORY LEVEL.

• 7.9 ft

  (MLLW) The Repaupo Creek overflows onto Flood Gates Road in Greenwich Township and Logan Township NJ.

• 7.7 ft

  (MLLW) MINOR FLOODING.

Highest crests on record

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