Neshaminy Creek is a 40.7-mile-long (65.5 km)[1] stream that runs entirely through Bucks County, Pennsylvania, rising south of the borough of Chalfont, where its north and west branches join.

The bridge nearest its mouth on the road to New York is a draw bridge-in private property, erected by the Messrs. Bassonet and Johnson, whose heirs and assigns levy tolls by virtue of the Act of Assembly 6th Sept. 1785.

Next, the stream passes into the Wissahickon Formation (lower Paleozoic), a schist which has metamorphosed into a facies, containing garnet, staurolite, kyanite, and sillimanite.

Finally, the Neshaminy passes through the Trenton gravel formation, from the Quaternary, which is sand and clay-silt where it meets the Delaware River.

[5] Like other rivers and streams, the Neshaminy Creek poses a flooding threat to neighboring areas in times of rapid downpours.

The waters of the creek have been known to rise more than 10 feet (3 m) above their normal level during severe storms, such as Hurricane Floyd, which hit the area on September 16, 1999.

In 2005, the Natural Resources Conservation Service earmarked $3 million for flood mitigation programs along the Neshaminy Creek.

In late August through early September 2011, Hurricane Irene, and Tropical Storm Lee (2011) rose the Neshaminy Creek to levels which had not seen before in 100 years.