Manton Ave Bridge Rehabilitation

The Manton Avenue Bridge is owned by the Rhode Island Department of Transportation (RIDOT) and spans approximately 53 feet over the Woonasquatucket River in Providence, Rhode Island. Built in 1913, the bridge is functionally obsolete and requires rehabilitation (Reference 13). Based on the National Bridge Inventory Database, the bridge is scour critical. Bridge foundations were determined to be unstable for assessed or calculated scour conditions. This project, which I worked on as an intern at WSP, provided recommendations for new bridge design specifications to comply with government regulations.

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Two types of hydrologic analyses were conducted for this project: a streamflow regression analysis with a nearby USGS stream gauge and a watershed delineation. I completed the watershed delineation. The Woonasquatucket River Watershed was delineated in ArcGIS with high resolution terrain data and the drainage network was mapped. A model of the drainage network was simulated in HEC-HMS and together with precipitation data, the flow hydrographs were computed for flood events of varying intensity. The hydrologic outputs of each storm event from both hydrologic analyses help provide a comprehensive view of the hydrology at the Manton Avenue Bridge project site.

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The results of this project will protect residents around the Manton Avenue Bridge against flood hazards. They will ensure that the construction plan accounts for long-term sustainability, which will extend the lifetime of the project and optimize its quality while considering budget constraints.

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