When the existing structure providing a connection between Saturday Cove Bay and Shaw Brook in Northport, Maine deteriorated due to brackish water, a replacement structure was needed. It was imperative that the replacement structure allow for the passage of aquatic organisms. Multiple options were considered, including an aluminum arch with cast-in-place end treatments, but this option was dismissed because it would have been too difficult to install it around the tide schedules.
In the end, a 27' x 5'-7" CON/SPAN® O-Series® Bridge System, 60' in length, was selected as the best solution for its ability to provide a clear span safe for fish passage, a quick and efficient installation, as well as resist the brackish water conditions. As the installation date approached and excavation occurred, it became evident that the section of rock ledge in which the foundations were designed for was not at the expected elevation. After Gartley & Dorsky Engineering & Surveying (GDES), the project's engineer, consulted with the engineers at Contech Engineered Solutions, Inc., the issue was resolved in a swift and cost effective manner.
"Working with Contech was an exceptional experience," stated Andrew D. Hedrich, P.E., Senior Engineer with GDES. "We had several bridge ideas we brought to the table, and Contech helped us thoroughly explore all of the options before guiding us to the best solution."
After the damaged structure was removed from the site, the new CON/SPAN system was installed via crane in just two days. The new structure met all of the performance specifications and was installed smoothly.
"Contech assisted with plans, designs, and ensured the construction sequencing lined up perfectly despite delays associated with uncovering troublesome existing conditions," added Hedrich. "I was very impressed with how readily available Contech personnel was both via email and over the phone, providing us with both direct and mobile numbers to allow us to reach the same person with any questions or issues."