The Yuba River Bridge at Parks Bar

The Yuba River Bridge at Parks Bar (HM10OP)

Location: Smartsville, CA 95977 Yuba County
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Country: United States of America
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N 39° 13.17', W 121° 20.005'

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Inscription

1913 - 1994

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
Details
HM NumberHM10OP
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Marker ConditionNo reports yet
Date Added Friday, October 24th, 2014 at 12:02pm PDT -07:00
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Locationbig map
UTM (WGS84 Datum)10S E 643869 N 4342458
Decimal Degrees39.21950000, -121.33341667
Degrees and Decimal MinutesN 39° 13.17', W 121° 20.005'
Degrees, Minutes and Seconds39° 13' 10.20" N, 121° 20' 0.30" W
Driving DirectionsGoogle Maps
Area Code(s)530
Closest Postal AddressAt or near 7901-7999 Timbuctoo Pl, Smartsville CA 95977, US
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