Tidal Bridge Replacement Project
Northstar Hydro worked with Kleinfelder and Maine DOT to provide hydrologic, hydraulic and scour engineering services related to replacement of the Benjamin River Bridge. Preliminary design identified key project issues including storm tide elevations, tidal cycling through the bridge, combination of tidal and upland flows and ongoing scour. The scour critical bridge was modeled using a GIS based dynamic HECRAS hydraulic model to simulate normal and storm tide conditions as well as upland flooding. Field data of tide elevation and flow velocity was also collected to provide calibration data for the hydraulic model.