While not usually described as gorges the Philadelphia area contains numerous narrow stream and river valleys which for all practical purposes should be called gorges. Most Philadelphia area gorges are 350 feet or less in depth and have been eroded into erosion resistant metamorphic and sedimentary rocks. Some Philadelphia area gorges now serve as major […]
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Water gaps are formed where a stream or river has cut a valley across some type of ridge. Pennsylvania’s water gaps are often associated with where streams and rivers have cut what are sometimes spectacular water gaps in the state’s Valley and Ridge Province. Often overlooked are numerous, but somewhat less specular water gaps found […]
Philadelphia area drainage systems and erosional landforms when viewed on detailed topographic maps can be considered to be pieces of a giant puzzle, which if properly assembled tells how the regional landscape was formed. The topographic maps which can be obtained from the United States Geological Survey National Map and TopoView websites provide a big […]
The Delaware River flows in a southwest direction along the Pennsylvania-New Jersey border until it turns to flow in a south direction under the Benjamin Franklin Bridge, which links the Philadelphia City Center with the Camden City Center. The abrupt change in the Delaware River direction of flow just north of the Benjamin Franklin Bridge […]
The Schuylkill River flows in a southeast direction into Philadelphia and just after flowing under the Roosevelt Avenue Bridge makes an abrupt turn to flow in a southwest direction. After flowing in a southwest direction the Schuylkill River flows under the Columbia Bridge and just west of the East Park Reservoir makes another abrupt turn […]
Wissahickon Creek has a relatively small drainage basin in southeastern Pennsylvania, but is located along the Schuylkill River-Delaware River drainage divide southern end and includes a well-known and picturesque gorge in northwest Philadelphia. The stream rises near Lansdale in Montgomery County and flows for approximately 23 miles in a south direction to reach northwest Philadelphia […]
To find specific landforms of interest use the category list on the side. This Philly Landforms website is creating in a blog format a catalog of Philadelphia, Pennsylvania area erosional landforms. Landforms of interest can be located by using the side bar category list where all landforms of a specific type or contained in a specific drainage […]
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