Sparkill in Rockland County, New York — The American Northeast (Mid-Atlantic)
Bridge Street Bridge Over The Sparkill Creek
Built 1880 - King Iron Bridge Company
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
Photographed By Rockland County Highway Department, 2009
1. Bridge Street Bridge Over The Sparkill Creek Marker
Photographed By Clare Sheridan, May 2, 2013
2. Bridge Street Bridge Over The Sparkill Creek Marker
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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.
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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.
Rehabilitated 2009 - Rockland County Highway Department - Charles H. Vezzetti, Superintendent
Erected 2009 by Rockland County Highway Department.
Topics. This historical marker is listed in this topic list: Bridges & Viaducts.
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. Touch for map. Marker is in this post office area: Sparkill NY 10976, United States of America. Touch for directions.
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); The Flywheel: A Monument to Piermont's Industrial Past (approx. 0.3 miles away); Piermont Station (approx. 0.3 miles away); John G. Bell (approx. 0.6 miles away); Gravesite of General John Charles Frémont (approx. 0.7 miles away).
Photographed By Robert Knight
3. Bridge Street Bridge Over The Sparkill Creek Marker
King Iron Bridge Company Logo on bridge
Credits. This page was last revised on August 6, 2016. It was originally submitted on August 3, 2016, by Clare Sheridan of Tappan, New York. This page has been viewed 301 times since then and 22 times this year. Photos: 1, 2, 3. submitted on August 3, 2016, by Clare Sheridan of Tappan, New York. • Bill Pfingsten was the editor who published this page.
Oct. 7, 2022