December 15, 2020: Project work is now substantially completed. All of the storm drain infrastructure has been completed on time and within the project budget. The only work that remains in the spring of 2021 is final repairs to pavement trenches in W. Commercial Street.
Over the past year West Commercial Street between Cassidy Point Drive and the Casco Bay Bridge has been shut down at least 5 times due to street flooding. The street flooding is the result of a 100 year old vitrified clay pipe which has collapsed. This project will construct a new storm drain system in West Commercial Street and tie into an existing drainage outflow line approximately 500' to the west of the low point in the street with the intent of mitigating the flooding.
In order to mitigate the flooding the contractor will install 720 feet of new storm drain pipe ranging from 10 inches to 30 inches in diameter. Along with the new pipe, the contractor will also install 4 new precast concrete catch basin inlet structures to help capture the water and convey it from the street to the new storm drain piping system. The new storm drain pipe system will connect to an existing Portland Water District Combined Sewer outflow line, which will convey the water to Portland Harbor.
Contractor: Gorham Sand and Gravel
Engineer: Gorrill Palmer Consulting Engineers
Owner: City of Portland Public Works Department
Project Manager: Justin Pellerin, P.E. Water Resources/Stormwater Project Engineer