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Missouri Department of Transportation

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Historic Bridges

Little Black River Bridge


Thayer Viaduct , Oregon County, Route 19

Click HERE to see photos of this bridge.

Bridge Location  
County: Oregon
Road: Route 19
Feature Crossed: Two Mile Creek and BNSF Railroad
Other Location Information:

approximately 1.25 miles north of Naylor

Structure Number or County Bridge Number: Bridge No. H0289
Bridge Information
Owner: MoDOT

1 pin-connected Pratt through truss and 2 rigid connected Warren pony trusses

Length: 305’ total length; 155’ through truss, 74’ and 75’ pony truss
Width: 20’ wide roadway with 5' sidewalk cantilevered on east side of bridge
Year Built: 1930
Builder: M. S. Cartter & Co., St. Louis (through truss), Martin Wunderlich (substructure & approaches)
Current Load Rating:

History of Modifications, Rehabilitations, etc.: Sidewalk added in 1949
Other Comments:
For further information, interested parties
may contact:
Name: Karen Daniels, Sr. Historic Preservation Specialist
Organization Missouri Department of Transportation 
Address: MoDOT Design Division, Historic Preservation Section, P.O. Box 270, Jefferson City, MO 65101
E-Mail: Karen.daniels@modot.mo.gov
Phone: 573-526-7346

Narrative Description:

The Thayer Viaduct (H0289) consists of a steel, eight-panel pin-connected Pratt through truss with two six-panel rigid-connected Warren pony truss approach spans on the north end. The sidewalk is cantilevered on the east side of the bridge and has a wooden deck and a chain-link fence.


The bridge is eligible for the National Register of Historic Places under criteria A and C for its significance in transportation and engineering. The Thayer Viaduct was cooperatively built by the Missouri State Highway Department and the Frisco Railroad during a time when an effort was being made to reduce at grade crossings to improve highway safety. The cost of the viaduct was shared between the two parties and the federal government. The through truss was designed by the Frisco Railroad and reflects structural features common for both highway and railroad trusses of the era. The pony truss approach spans were standard Missouri State Highway Department designs.


MoDOT’s Historic Preservation Section is now accepting proposals for the relocation and reuse of the bridge until December 31, 2018. A proposal checklist is available MoDOT’s Free Bridges website (http://www.modot.org/freebridges/). Preservation covenants may accompany the bridge.



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