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This classic Pratt truss bridge has an unusual portal and strut design giving it a unique appearance.
Information and Findings From DHPA Historic Bridge SurveyStatement of Significance The Newcastle Bridge Company billed the county $685 in December 1904 for work on a bridge in S26/T18N/R2E, which could be either #207 or #187. Seated upon caissons and a metal plate behind driven I-beam substructure on the west and replacement concrete abutments and wing-walls on the east, this single-span, pin-connected Pratt through structure carries latticed portal struts and fan-shaped portal bracing. A pair of latticed channels provides the intermediate verticals, and a pair of die-forged eye-bars serve as the diagonals in all except the center panel. A pair of adjustable and cylindrical rods supply the diagonals and counters for the center panel. Single adjustable rods counter the diagonals in the third and fifth panels. The I floor-beams are U-bolted to the lower pins. They support runs of I-beam stringers with a timber deck above. The trusses are lined with latticed guardrails and allow for 16 feet and 8 inches of vertical clearance. The superstructure is rather conventionally designed. The remaining, original metal substructure is noteworthy. Other Information References Beam, Longest, & Neff, Inc., Bridge Inventory Rating and Safety Inspection: Boone County (Indianapolis, 1977, 1981). Bernardin, Lochmueller & Associates, Bridge Inspection Report: Boone County (Evansville, 2003). Indiana Historic Sites & Structures Inventory, Boone County: Interim Report (Indianapolis, 1982), 50-51. Boone County, "Claim Docket," 7: 264. Bridge Considered Historic By Survey: Yes |
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