Sparkill in Rockland County, New York — The American Northeast (Mid-Atlantic)
Bridge Street Bridge Over The Sparkill Creek
Built 1880 - King Iron Bridge Company
Inscription. The Bridge Street Bridge was constructed in 1880 by the King Iron Bridge Company of Cleveland Ohio. It survives as a unique example of a small late 19th century hand operated mechanical drawbridge. The lifting system dates back to drawbridge designs used during the middle ages. The bascule span is lifted by steel chains attached to the far corners at one end, with the other ends of the chains wrapped around constant diameter drums or sheaves. Counterweights are hung by chains at the towers, which wrap around variable diameter drums so that each successive wrapping is smaller. The counterweight drums and the lifting chain drums are mounted on a common shaft. As the diameter of the counter weight drums gets smaller the mechanical advantage of the counter weight decreases. In this way, as the bascule span opens the mechanical advantage needed from the counter weights continues to decrease. This is a unique characteristic of the Bridge Street Bridge. It is unknown if any other bridges are in existence today that contain a similar mechanism. The bridge was operated by a hand crank at the base of the tower, which was connected to the counterweight and lifting shaft through a gear and pulley system. This system allowed the bridge to be opened and closed by hand with a relatively constant effort.
By Rockland County Highway Department, 2009
1. Bridge Street Bridge Over The Sparkill Creek Marker
The bridge was closed to vehicular traffic
in 1991 but was rehabilitated in 2008-2009 to remain as an important link to Rockland County's historic heritage.
By Clare Sheridan, May 2, 2013
2. Bridge Street Bridge Over The Sparkill Creek Marker
Rehabilitated 2009 - Rockland County Highway Department - Charles H. Vezzetti, Superintendent
Erected 2009 by Rockland County Highway Department.
Location. 41° 2.251′ N, 73° 54.964′ W. Marker is in Sparkill, New York, in Rockland County. Marker is on Bridge Street, in the median. Click for map. Marker is in this post office area: Sparkill NY 10976, United States of America.
Other nearby markers. At least 8 other markers are within walking distance of this marker. Last Stop U.S.A. (about 300 feet away, measured in a direct line); Sneden House (about 600 feet away); Bogertown (approx. ¼ mile away); Roll of Honor (approx. ¼ mile away); Gravesite of General John Charles Frémont (approx. 0.7 miles away); St. Charles A.M.E. Zion Church (approx. ¾ mile away); John Charles Fremont (approx. ¾ mile away); a different marker also named John Charles Fremont (approx. ¾ mile away). Click for a list of all markers in Sparkill.
Categories. • Bridges & Viaducts •
By Robert Knight
3. Bridge Street Bridge Over The Sparkill Creek Marker
King Iron Bridge Company Logo on bridge
Credits. This page originally submitted on , by Clare Sheridan of Tappan, New York. This page has been viewed 97 times since then. Photos: 1, 2, 3. submitted on , by Clare Sheridan of Tappan, New York. • Bill Pfingsten was the editor who published this page. This page was last revised on August 6, 2016.