McClure provided preliminary and final bridge design, hydraulic analysis, geotechnical design, and construction inspection services for the replacement of an existing pony truss bridge over a tributary to the Upper Iowa River in Decorah, Iowa. The new structure is a 100’-10” by 27’-0” single-span prestressed concrete beam bridge, constructed in stages to maintain continuous vehicular and pedestrian access to a local business, private residence, an adjacent campground, and the popular Trout Run Trail loop. Aesthetic enhancements were incorporated into the design, including ornamental metal railings and concrete form liners that mimic the appearance of natural limestone on the barriers and wingwalls.

The original 91’-6” by 19’-0” pony truss bridge was built in 1927 on Highway 9 and relocated to this site in 1948. Due to age and advanced deterioration, it had been weight-restricted to 15 tons and classified as Structurally Deficient. Initial project plans called for reconstructing the bridge on the same alignment, which would have required a temporary causeway across the channel. However, the concrete-lined drainage channel is susceptible to high stream velocities and flash flooding, increasing the risk of erosion or total loss of the temporary crossing. To mitigate these risks, McClure adjusted the horizontal alignment to allow for stage construction and maintain access without the need for a causeway. Additionally, McClure collaborated with the Iowa DOT to resolve discrepancies in the reported AADT at the site, which helped reduce the required bridge width and permitted the design of a shared-use structure without a median separator.