THE CONCRETE BRIDGE MAGAZINE

FALL 2011

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.

Issue link: http://www.aspiremagazinebyengineers.com/i/306189

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Built in 1928, the 570-ft-long, eight- span, tied-arch Covered Bridge over the Kennebec River in Norridgewock, Maine, was named one of Maine's most significant twentieth century bridges by the Maine Historic Preservation Commission. It was a visible landmark, an integral part of Norridgewock's identity reflected on the town's logo and letterhead—and, unfortunately, it had outlived its service life. Rehabilitating or replacing the structure divided a community that was proud of the structure's historic significance. It was up to the Maine Department of Transportation (MaineDOT) and its engineering team to come up with a feasible, prudent solution that would satisfy the more than 3000 residents of this community and many others interested in historic preservation. Community Connections To e n s u r e c o m m u n i t y s u p p o r t , t h e a g e n c y f o r m e d a 1 0 - p e r s o n committee to determine the new bridge's look and feel. The committee i n c l u d e d t h e N o r r i d g e w o c k t o w n manager, prominent residents, as well as representatives from the Maine Historic Preservation Commission, the MaineDOT and the Federal Highway Administration. T h e c o m m i t t e e c o n s i d e r e d t h e sentiment attached to the 80-year-old bridge and resolved to build another landmark-type structure. Ultimately, they wanted a "modern" historic bridge that would match the aesthetic and historic appearance of the original bridge with a service life of 100 years and a clearance sufficient for a 50-year flood. profile THE COv ERED BRIDGE Ov ER THE KENNEBEC RIvER / NORRIDGEWOCK, MAINE br IDgE DESI gN E NgINEEr: Kleinfelder, San Diego, Calif. pr IME CoNTrACTor: Reed & Reed Inc., Woolwich, Maine C oNSTruCTIoN ENgINEEr: McNary Bergeron & Associates, Broomfield, Colo. FLoor bEAM prECASTEr: J.P. Carrara and Sons Inc., Middlebury, Vt., a PCI-certified producer DECk pANEL prECASTEr: Oldcastle Precast Inc., Auburn, Maine, a PCI-certified producer buLb-TEE bEAM prECASTEr: Strescon Limited, Bedford, NS, Canada, a PCI-certified producer CoNCrETE SuppLIEr: Mattingly Products Co. Inc., North Anson, Maine poST-TENSIoNINg SuppLIEr: VSL, Hanover, Md. by Craig Weaver, Kleinfelder Re-Creating History: Modern Techniques Preserve Character of Historic Bridge Early photo of the four consecutive concrete tied arch spans of the Covered Bridge in Norridgewock, Maine, constructed in 1928. Photo: Maine Department of Transportation. A 135-ft-long, 6-ft-deep bulb-tee beam approach span frames into the 300-ft-long concrete tied arch span at Pier 2. Photo: Kleinfelder. 34 | ASPIRE , Fall 2011 Book_Fall11.indb 34 9/29/11 11:59 AM

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