Home > In The Spotlight > Delaware River Basin Flooding from Ida (Sept. 3, 2021)
Delaware River Basin Flooding from Ida (Sept. 3, 2021)
September 3, 2021

All flood forecast locations in the Delaware River Basin, including the mainstem Delaware River, are now below flood stage and waters continue to recede.

Rivers will remain high and fast. Low-lying and flood-prone areas, as well as locations in the extended flood plain, still contain water. The cleanup will continue for some time.

Our thoughts are with those who lost a loved one or experienced damage from the tornadoes and flash flooding.

And, a resounding thank you to all our first responders, emergency personnel, volunteers and meteorologists for keeping us safe and up to date during & after the storm!

Precipitation

As mentioned yesterday, a large portion of the Delaware River Basin saw anywhere from three to ten+ inches of rain on September 1-2, 2021; see graphic below. 

The highest amounts of rainfall fell from roughly south of the Poconos to Wilmington, including the Schuylkill, Lehigh, lower Delaware, Perkiomen, Neshaminy and Brandywine watersheds.

The upper basin and the far lower basin (southern Delaware and New Jersey) saw the least rainfall from Ida’s remnants.

In the upper basin, the only flood forecast location to experience flooding was the Lackawaxen River at Hawley. No flooding occurred at any other upper basin flood forecast location; this includes the New York City Delaware Basin reservoirs and points downstream of them.

Precipitation in the Delaware River Basin from Ida. Graphic by DRBC.

Flooding

Some flooding at points along the Delaware River Estuary is FORECASTED in the coming days with the high tide cycles.

Visit https://water.weather.gov/ahps2/index.php?wfo=phi  for real-time and forecasted information from the National Weather Service.

Many flood forecast locations in the Delaware River Basin experienced major, moderate or minor flooding from Ida’s remnants. These include:

MAJOR FLOODING occurred along the Schuylkill River (Norristown and Philadelphia, PA) and the Lehigh River (Lehighton and Glendon, PA). Locations on the Brandywine and Christina rivers and the Neshaminy, Pennypack, Frankford, White Clay Perkiomen and Assunpink creeks also experienced major flooding.

MODERATE FLOODING occurred along the Lackawaxen River (Hawley, PA), Schuylkill River (Berne and Landingville, PA), Lehigh River (Allentown and Walnutport, PA), Jordan Creek (Allentown, PA), Brodhead Creek (Analomink, PA), White Clay Creek (Newark, DE), Red Clay Creek (Wooddale, DE) and Chester Creek (Chester, PA).

MINOR FLOODING occurred along the Delaware River (Easton, Riegelsville, Frenchtown, Stockton, New Hope – Lambertville, Washington Crossing and Trenton), Schuylkill River (Reading and Pottstown, PA), Lehigh River (Bethlehem, PA), Brodhead Creek (Minisink Hills, PA), Bush Kill (Shoemakers, PA), Paulins Kill (Blairstown, NJ) and Pequest River (Huntsville, NJ).

Based on information from the National Weather Service, RECORD FLOODING occurred at the following locations:

  • Penns Park, PA (Neshaminy Creek)
  • Modena, PA (W. Branch Brandywine Creek)
  • Downingtown, PA (E. Branch Brandywine Creek)
  • Chadds Ford, PA (Brandywine Creek)
  • Wilmington, DE (Brandywine Creek)
  • Schwenksville, PA (E. Branch Perkiomen Creek)
  • Graterford, PA (Perkiomen Creek)
  • Norristown, PA (Schuylkill River)
  • Philadelphia - 30th Street (Schuylkill River)

Please Note:

  • Please do not travel on flooded roadways. Turn around, don’t drown!

  • Please do not swim or have contact with floodwaters. These waters likely contain debris and other hazards, including raw sewage and other chemicals. Use extreme caution if recreating on the river – boating, kayaking, fishing – this holiday weekend.

  • The DRBC will continue to monitor flood information from the National Weather Service. Stay tuned for a full event summary sometime next week.

 

The Lambertville Inn (left) and the Delaware River. Photo by DRBC. The Washington Crossing Bridge and the Delaware River. Photo by DRBC. The Delaware River, looking across to Trenton, N.J. from Morrisville, Pa. Photo by DRBC.
Delaware River, Lambertville, N.J.
Photo by DRBC.
Delaware River, Washington Crossing,
Pa. Photo by DRBC.
Delaware River, looking to Trenton,
N.J. from Morrisville, Pa. Photo by DRBC.
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