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Lamine Bridge

MO-41 Lamine River Bridge

   
                  


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Bridge Documented: July 3, 2009
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Key Facts
Bridge Name Facility Carried / Feature Intersected Location Structure Type Construction Date and Builder/Engineer
! Lamine Bridge
MO-41 Lamine River Bridge
MO-41 Over Lamine River Lamine: Cooper County, Missouri Metal 10 Panel Rivet-Connected Parker Through Truss, Fixed and Approach Spans: Metal 4 Panel Rivet-Connected Warren Pony Truss, Fixed 1933 By Builder/Contractor: Carrothers and Crouch of Kansas City, Kansas
Technical Facts
Main Span Length Structure Length Roadway Width Main Spans Approach Spans NBI Number
201 Feet (61.3 Meters) 523 Feet (159.4 Meters) 22 Feet (6.7 Meters) 1 5 5726

Historic Significance Rating (HSR)

Primary Photographer(s): Nathan Holth and Rick McOmber

This Bridge's Future Is At Risk!

View Archived National Bridge Inventory Report - Has Additional Details and Evaluation

This bridge is one of the most important standard plan truss bridges in Missouri because it contains a main span that is among the longest Parker truss spans in the entire state. In addition, the bridge includes a Warren pony truss approach span at both ends of the main span. In addition, there are two stringer approach spans. The pony/through truss combination and the multi-span configuration in general, and the large size of the main span all combine together with this bridge's good historic integrity to make it a highly important historic bridge and one  very worthy of preservation. Located next to a river access area, the bridge contributes both history and beauty to the publically accessible location. Indeed, with its sweeping main span and complimentary flanking pony truss spans, this is a very graceful and gorgeous structure. Recognized by the historic bridge inventory as eligible for the National Register of Historic Places, this bridge stands out among all of Missouri's standard plan truss bridges as significant. While many of Missouri's standard plan truss bridges are all worthy of preservation and are feasible to preserve, this bridge is particularly important to preserve and HistoricBridges.org noted nothing that would make a comprehensive rehabilitation difficult, costly, or ineffective. This is a bridge than can and should be preserved.

This bridge is one of Missouri's remaining standard plan truss bridges. As the first and second decades of the  20th Century passed by, the movement to have states develop standard plans for bridges for the purpose of bringing a greater measure of quality control, efficiency, and consistency to bridgework in the nation took hold. In response to this movement, states developed standard plans for the bridge types that were most common and functional during the period. From the mid 1910s through the 1940s, many (but not all) states had developed standard plans for truss bridges which were used to in situations where large spans were desirable. While these standard plan truss bridges meant an end to the diversity of truss bridge appearances and designs seen during the earlier period where individual bridge companies designed the bridges, these standard plan truss bridges remained among the most intricate and visually intriguing bridge types. In addition, variety was still achieved because these standard plans were revised over the years, and different designs for different span lengths existed, and differences in skew and span numbers create additional variety. Moreover, these standard plan truss bridges are interesting because while they are all similar within each state, they are quite different from state to state because each state designed its own standard plans for truss bridges, and the designs they chose might be quite different from other states. Among the fifty states differences seen among truss bridge standard plans include truss configuration, portal bracing designs, built-up and rolled beam designs and placements, railing, and plaques.

Missouri's standard plans for trusses are usually either a Parker truss (long spans), a Pratt through truss (medium spans), and a subdivided Warren pony truss (short spans). Perhaps the most distinctive feature of Missouri's standard plan through truss bridges is their portal bracing. On most truss bridges, the portal bracing is the most structurally and visually substantial piece of bracing on the bridge. While Missouri's portal bracing may be structurally substantial, visually it is one of the smallest portal bracings ever seen, consisting of a single rolled or built-up beam, depending on the bridge. The sway bracing on through truss bridges is also simple, often being the same design as the portal bracing, if less massive. In contrast, the diagonals and verticals of the truss web tend to be built-up beams that are more visually appealing because they contain a combination of v-lacing and battens to create their built-up beams at these locations. Top chords on the bridges are generally built-up box beams that include v-lacing on the bottom. Indeed, v-lacing is the trend on these bridges for built-up beams, along with battens. Lattice is not usually seen. Plaques on the bridges are simple and uninformative, with historical information limited to no more than the construction date. Looking at all the features of Missouri's standard plan truss bridges, in terms of aesthetic quality, they rate similarly in aesthetic quality standard plan truss bridges in other states.

Information and Findings From Missouri's Historic Bridge Inventory

Bridge Features

Superstructure: steel, 9-panel, rigid-connected Parker through truss; rigid-connected Warren pony truss approach span at each end; three steel stringer approach spans
Substructure: concrete abutments, wingwalls and piers
Floor/decking: concrete deck over steel stringers
Other features: steel guardrails

Discussion of Bridge

This large-scale highway truss spans the Lamine River some seven miles southwest of Boonville, the Cooper County seat. The bridge is comprised of a 200-foot Parker through truss over the rivers main channel, flanked on both sides by 80-foot Warren pony trusses. In 1933 engineers for the Missouri State highway Department designed the Lamine River Bridge as a replacement for an earlier county- built truss. A contract for its fabrication and erection was let that May to Carruthers and Crouch for $40,246.02. Completed later that year, the Lamine River Bridge has carried vehicular traffic, with only maintenance-related repairs. In the early 1930s the state highway department began using rigid-connected Parker trusses for its long-span crossings. With its polygonal upper chords, the Parker was somewhat more materially conservant that straight-chorded Pratt trusses, making its use more economical for spans in excess of 160 feet. Most of MSHD's Parkers ranged between 150 and 180 feet in span length. With its 200-foot length, the central span on the Lamine River Bridge in Cooper County ranked among the state's longest Parker trusses. Seven other 200-foot Parkers and two other bridges with longer spans have been identified by the statewide inventory. The Lamine River Bridge is thus a well-preserved, relatively long-span example of a mainstay structural type in Missouri.

Bridge Considered Historic By Survey: Yes

View Original PDF Historic Bridge Inventory Sheet

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