The Otis Dam and the Otis Dam Bridge in Otis, MA were reconstructed by the Department of Conservation and Recreation (DCR) in 2011. The required construction detour was overly long, prompting DCR to prohibit construction during the recreational season. The entire project was completed over two seasons, but the spillway substructure and superstructure were constructed over the course of a single winter.
The schedule was successfully met with the use of a prefabricated superstructure. The modest 42 foot long steel and concrete composite structure was fabricated off site, brought in by truck, and lifted into place by crane once the substructure was substantially complete.
Final design was initiated at the end of March, 2010 and bid documents were issued at the beginning of June, 2010. The bridge was lifted into place on schedule at a cost of approximately $300,000.
David Greenwold was the Engineer of Record and Project Engineer for all phases of work.