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Iroquois 3000 Bridge

"TR-434 Bridge"

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Most Recent Visit To Bridge: August 13, 2006

Key Facts

Bridge Name

Type Road Location City Crossing
Iroquois 3000 Bridge

Truss

Iroquois 3000

Iroquois County, IL

Rural

Sugar Creek

Technical Facts

Construction Date

Rehabilitation Date

Structure Length Roadway Width
1916 (Debatable) 1933 70.87 Feet 13.45 Feet

This date seems too new, especially considering the narrow deck width, unusual top chord and end post design, and pin connected structure. The bridge may be much older than the national bridge inventory suggests.

This is an extremely short through truss at just under 71 feet in length! The bridge has five panels, is pin connected, and features a wooden deck that is a bit broken up in spots. Typical of Iroquois County, there are channel railings, which are oddly mounted and out-of-place looking on this bridge, suggesting that Iroquois County replaced original railings long ago before "modern" railings were around. Perhaps the most stunning and noticeable aspect of this beautiful bridge is the v-lacing on both sides of the top chord and end posts. Such a small change in the design of a truss bridge results in a vastly different appearance. With v-lacing on both sides, it makes the bridge look more lightweight and open. There is also v-lacing on the sway bracing and verticals to top off the effect. The portal bracing is an a-frame design. The bridge's abutments are concrete. Overall, this was one of my favorite Iroquois County truss bridges of the trip, and I hope it is maintained and preserved.

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