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MARKER DATABASE
“Bite-Size Bits of Local, National, and Global History”
“Bite-Size Bits of Local, National, and Global History”
Near Smartsville in Nevada County, California — The American West (Pacific Coastal)
 

The Yuba River Bridge at Parks Bar

1913 - 1994

 
 
The Yuba River Bridge at Parks Bar Marker image. Click for full size.
By Syd Whittle, April 7, 2012
1. The Yuba River Bridge at Parks Bar Marker
Inscription. William M. Thomas of Thomas and Post Consulting Engineers designed the 685-foot-long Parks Bar Bridge in 1912 for Yuba County. The original 16-foot-wide bridge with four 140-foot-long arch spans was constructed by the Portland Concrete Pile Company in 1912-13. The bridge was widened to 22 feet in 1924. It was removed in 1994 after a new bridge was built downstream.

William Thomas established himself as a leader in early reinforced concrete bridge design by developing the "Thomas System." This system consisted of precast construction, three-hinge arches and open spandrels. Each arch had three flexible connections: one on each base and one joining the arch halves in the middle. Open spandrels (triangular spaces between the arches and the deek) added to the beauty of the bridge.

Over time, the river bed lowered and eroded the bridge's base. Undermining of the footings hastened replacement of this impressive early example of the "Thomas System."

This bridge was determined eligible for the National Register of Historic Places in 1984
 
Location. 39° 13.17′ N, 121° 20.005′ W. Marker is near Smartsville, California, in Nevada County. Marker is on Timbuctoo Road south of California Highway 20. Touch for map. Timbuctoo Road
The Yuba River Bridge at Parks Bar Marker image. Click for full size.
By Syd Whittle, April 7, 2012
2. The Yuba River Bridge at Parks Bar Marker
Bridge foundations are visible behind the marker.
is the access road to the river. Marker is in this post office area: Smartsville CA 95977, United States of America.
 
Other nearby markers. At least 8 other markers are within 4 miles of this marker, measured as the crow flies. Timbuctoo (approx. 0.9 miles away); Sucker Flat (approx. 1.9 miles away); Church of the Immaculate Conception (approx. 2.1 miles away); Smartsville Grocery (approx. 2.1 miles away); Smartville / Smartsville (approx. 2.1 miles away); Edward James McGanney (approx. 2.1 miles away); Mooney Flat Hotel (approx. 3.2 miles away); Hammon Grove (approx. 3.6 miles away). Touch for a list and map of all markers in Smartsville.
 
Also see . . .
1. Historic American Buildings Survey, Engineering Record. Information regarding the bridge along with numerous photos of its construction and completion. (Submitted on April 8, 2012.) 

2. William Thomas. A short biography of William Thomas published in Western Edition Notables of the West, Vol. I, Page 778. Published in 1913. (Submitted on April 8, 2012.) 
 
Categories. Bridges & Viaducts
 
The Yuba River Bridge at Parks Bar Foundation Ruins image. Click for full size.
By Syd Whittle, April 7, 2012
3. The Yuba River Bridge at Parks Bar Foundation Ruins
The Yuba River Bridge at Parks Bar image. Click for full size.
Library of Congress, circa 1913
4. The Yuba River Bridge at Parks Bar
View of the Replacement Bridge image. Click for full size.
By Syd Whittle, April 7, 2012
5. View of the Replacement Bridge
 
 
Credits. This page was last revised on June 16, 2016. This page originally submitted on April 8, 2012, by Syd Whittle of El Dorado Hills, California. This page has been viewed 750 times since then and 50 times this year. Photos:   1, 2, 3, 4, 5. submitted on April 8, 2012, by Syd Whittle of El Dorado Hills, California.
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