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{{Infobox Bridge |
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|bridge_name = Lacon Bridge |
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|image = Lacon Bridge-1.JPG |
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|caption = Smaller continuous truss bridge over the Illinois River at Lacon, Illinois |
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|official_name = Lacon Bridge |
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|carries = Two lanes of [[Illinois Route 17]] |
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|crosses = [[Illinois River]] |
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|locale = [[Lacon, Illinois]] |
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|maint = [[Illinois Department of Transportation]] |
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|id = 000062000314852 |
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|design = Steel truss through deck bridge |
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|mainspan = |
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|url= |
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|length = 1,573 feet, 378 feet at its longest span |
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|width = 2 traffic lanes, 26 feet (12 meters) |
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|height = 60 feet above water, 500 feet above sea level |
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|load = |
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|clearance = |
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|below = |
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|traffic = |
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|begin = |
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|complete = |
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|open = 1939 |
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|closed = |
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|toll = |
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|map_cue = |
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|map_image = |
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|map_text = |
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|coordinates = |
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|lat = |
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}} |
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The '''Lacon Bridge''' is a crossing of the [[Illinois River]] in the community of [[Lacon, Illinois]]. Built in 1939, it is one of the oldest crossings of the Illinois River. |
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==Description/History== |
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A very large [[continuous truss bridge]] carries Illinois State Highway 17 across the Illinois River south of the [[LaSalle, Illinois|LaSalle]][[Peru, Illinois|Peru]] area and north of the [[Peoria, Illinois|Peoria]] area. This little farming community sees relatively little traffic. |
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This style truss bridge is called a continuous truss as opposed to a simple truss frame. A simple truss has two piers, one at each end point. A continuous truss has 3 or more piers. In the case of the Lacon Bridge, it has 4 piers, one on each end, and two mid-channel. The continuous truss bridge is one rigid structure that spans more than 2 piers. In contrast, we often see simple trusses mounted back to back across 4 to 6 piers, as in the Henry Bridge just up stream. The continuous truss can be built with longer main channel spans than simple truss bridges, so they are used in cases where you want a wide navigation channel. There are many continuous truss bridges over our major rivers, but they have the disadvantage that they are costly to maintain. As a result, new bridges are being built using the cable stayed method (like the Clark Bridge in Alton) or the post-tension concrete segment method (like the new I-35W Bridge in Minneapolis). |
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{{Coord missing|Illinois}} |
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[[Category:Bridges completed in 1939]] |
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[[Category:Buildings and structures in Marshall County, Illinois]] |
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[[Category:Bridges over the Illinois River]] |
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{{US-bridge-struct-stub}} |