FALL 2018

ASPIRE is a quarterly magazine published by PCI in cooperation with the associations of the National Concrete Bridge Council. The editorial content focuses on the latest technology and key issues in the Concrete Bridge Industry.

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Page 29 of 51

Originally built in 1915, the Second Street Bridge over Three-Mile Creek i n L e a v e n w o r t h , K a n s . , w a s t h e last remaining original concrete arch crossing the creek. It was slated for rehabilitation in 2008, but inspection found extensive damage and so it became eligible for replacement. The project replaces the 50-ft-long concrete arch structure and includes reconstruction of Second Street to the north and south of the bridge. Leavenworth is a town of about 35,000 people and home to Fort Leavenworth, which was a key supply base in the settlement of the American West and is currently a major military installation. Second Street is a main road in the downtown area, with an average daily traffic of 1100 vehicles. Residents rely on this throughway to connect them between downtown and residential areas. Construction for this project began in May 2017, and the new bridge opened to traffic October 2017. The schedule was aggressive due to the constraints of when and how long the utilities crossing Three-Mile Creek were allowed to be shut down. To meet heating demands, the gas line could not be shut off until May and had to be operational by October. The bridge also crosses over a shared-use trail, and it carries traffic from Leavenworth Landing Park into the heart of downtown, a historic area close to the Missouri River that is being revitalized by private development and city infrastructure projects. Advantages of Precast Concrete Box Beams Initially, the City of Leavenworth intended to replicate the original arch-type structure in the new bridge. However, because of the small footprint of the project, geotechnical limitations, and funding constraints, that plan could not be implemented. Still, the designers kept the aesthetics of the original bridge in mind. Ultimately, a single- span structure with adjacent precast, prestressed concrete box beams was selected. The new structure maintains profile SECOND STREET BRIDGE OVER THREE-MILE CREEK / LEAVENWORTH, KANSAS BRIDGE DESIGN ENGINEER: TranSystems, Kansas City, Mo. PRIME CONTRACTOR: L.G. Barcus and Sons, Kansas City, Kans. PRECASTER: Coreslab Structures, Kansas City, Kans.—a PCI-certified producer SECOND STREET BRIDGE OVER THREE-MILE CREEK by Michael McDonald, City of Leavenworth, Kans., and Lindsay Madsen, TranSystems The new single-span adjacent precast, prestressed concrete box-beam bridge with the shared-use trail beneath. All Photos and Figures: TranSystems/City of Leavenworth. The new railing has a similar aesthetic pattern to that of the former arch bridge. 28 | ASPIRE Fall 2018 P R O J E C T

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