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| Key Facts |
| Bridge Name | Facility Carried / Feature Intersected | Location | Structure Type | Construction Date and Builder/Engineer | |
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Big Creek Road Bridge
Iowa Bridge Number 220880 | Big Creek Road Over Big Creek | Bertram: Linn County, Iowa | Metal 6 Panel Pin-Connected Pratt Through Truss, Fixed and Approach Spans: Wood Stringer (Multi-Beam), Fixed | By Builder/Contractor: Unknown |
| Technical Facts |
| Rehabilitation Date | Main Span Length | Structure Length | Roadway Width | Main Spans | Approach Spans | NBI Number |
| 1929 | 100 Feet (30.5 Meters) | 118 Feet (36 Meters) | 15.4 Feet (4.7 Meters) | 1 | 1 | 220880 |
The National Bridge Inventory lists a 1929 construction date for this bridge. Given the style of the bridge which includes fishtail style built-up floorbeams, and that the bridge is similar in appearance to the nearby Ely Street Bridge, it seems likely that this bridge was built in the 1890s as well. The 1929 date likely refers to a rehabilitation or relocation of this bridge.
The Big Creek Road Bridge contains a through truss main span that includes six panels. There is also a single wooden stringer approach span. The truss span is traditionally composed. The composition of the truss is as follows: Top chord and end post: back-to-back channels with cover plate and v-lacing. Hip verticals: loop-forged eyebars. Other verticals: back-to-back channels with lattice on each side. Bottom chord: loop-forged eyebars. Portal bracing: paired angles riveted to lattice webbing. Sway bracing: two paired angles riveted together with v-lacing. Lateral bracing: rod. Floor beams: built-up "fishtail" style beams. Railing: Modern Armco guardrails. Deck: wooden deck with asphalt wearing surface. Substructure: Metal caissons (lally columns).
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