Easton- Phillipsburg Bridge also known as the Northampton Street Bridge
Location: Easton, PA & Phillipsburg, NJ Waterway: Delaware River Bridge Dimensions: Spans: 125'. anchor spans and a 50' center suspended span Year: 1896	Bridge Type: cantilever truss

BRIDGE HISTORY

James Madison Porter III, a native of Easton designed this bridge. He was a civil engineer and a former instructor at Lafayette College in Easton, Pennsylvania. Porter's bridge design resembles a suspension bridge.

BRIDGE STRUCTURES

The truss was divided into 22 25' panels, formed into 125' anchor spans, 125' river cantilever arms, and a 50' center suspended span.

This is a view from the south side of the bridge.		Here' another view from the Pennsylvania side of the bridge. The roadway is 32' wide.
One of two stone masonry piers used to support the bridge is shown here.		This is a view of four bearings located under the main truss vertical members on the river piers.
Two sidewalks are cantilevered outside the trusses with a width of 7'6", one on each side of the bridge.		Note the triangulation below and outside the sidewalk cantilevers.
Most of the tension members, the top chords and most diagonals, are made of two or four steel eyebars.		On a simple level, these tension members are a rigid wheel and axle system.
Truss joints are connected with pins ranging from 5 1/2" to 8" in diameter.		Medium steel, soft steel, wrought iron, and cast iron are used in the construction of this bridge.
Eyebar members are a variety of lengths and sizes.		Box sections with double lacing serve as vertical structural elements.