Tag archives for water gap

Erosional History of the Sandy Run Drainage basin, Montgomery County, Pennsylvania

Introduction: Sandy Run is an interesting secondary drainage route as it drains the Chester Valley east end (also known as the Roslyn Valley) in a west-southwest direction, but instead of continuing a short distance further on the Chester Valley floor to join south oriented Wissahickon Creek, it turns in a north direction to flow through […]

Bucks County water gaps inventory by township

This inventory identifies Bucks County’s most obvious water gaps by township as seen on 1:24,000-scale United States Geological Survey topographic maps and is not complete. Bucks County streams cross rock layers of varying resistance to erosion and many less obvious water gaps exist. Only townships containing the most obvious water gaps are listed here. Bedminster […]

Millstone River water gap near Princeton, NJ

An interesting New Jersey landform providing significant information related to Philadelphia area landforms is the Millstone River water gap located near Princeton. The Millstone River flows in a northwest direction, as seen at location 1 in figure 1, to enter Carnegie Lake at Princeton and then to flow in a north direction to location 2. […]

Landforms seen along SEPTA’s Norristown High Speed Line

Introduction: Trains on the Norristown High Speed Line (NHSL) require approximately 30 minutes to travel 13.4 miles from SEPTA’s 69th Street Terminal to the Norristown Transportation Center, yet that relatively short trip involves crossing several creeks and a major river, climbing up and down as several drainage divides are crossed, passing through a water gap, […]

Schuylkill River Elbows of Capture Upstream from Valley Forge National Historical Park

The Schuylkill River between Phoenixville and Norristown makes several remarkable direction changes including two complete U-turns just upstream from Valley Forge National Historical Park. Other interesting Schuylkill River U-turns or perhaps incised meanders are found between Pottstown and Phoenixville, although this essay will focus on the U-turns between Phoenixville and Valley Forge National Historical Park. […]