Tidal

Benjamin River Bridge between the Towns of Brooklin and Sedgwick, Maine. 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 […]

Route 1 over Machias River, Machias, Maine. Fish passage and bridge replacement study.

Northstar Hydro worked with Stantec to model and understand the flow of tidal and fresh water through the tide gates in the Route 1 causeway in Machias, Maine over the Middle River.  Dynamic modeling of tide fluctuation was combined with numerous options for bridge replacement ranging from replace in kind to full restoration of tidal […]

Thompson’s Bridge Replacement over Decker Cove, Southport, ME

Northstar Hydro, Inc. provided hydrologic, hydraulic and scour analysis to Maine DOT’s contractor for preliminary design for proposed replacement of the four span Thompson’s Bridge over Decker’s Cove. The project included unsteady flow modeling with model HECRAS and field monitoring to provide data on water elevations, velocities, and rate of flow through the bridge under […]

Oceanville Bridge, Stonington, ME

Northstar Hydro, Inc. provided hydrologic, hydraulic and scour analysis to Maine DOT’s contractor for preliminary design for the Oceanville Bridge replacement in Stonington, Maine.  This bridge connects two islands and allows tidal interchange in the channel that divides the two islands.  Flow is complex and analysis included modeling, on-site monitoring and data review to determine […]

Bass Harbor Bridge, Tremont, ME

Northstar Hydro, Inc. provided design services related to hydrologic and hydraulic modeling to VHB, Maine DOT’s contractor, for preliminary design of a replacement bridge at Bass Harbor in Tremont, Maine.  Critical issues at the site include restricted flow that influences tidal water levels inland of the bridge and rapid flow through the bridge.  Upstream of […]

Bike Path Bridges, Barrington/Warren, RI

Northstar Hydro, Inc. provided preliminary design hydrologic, hydraulic and scour assessments for RIDOT’s contractor for two bridges in Rhode Island that will be replaced and carry a high use bike/pedestrian path over the Barrington and Palmer Rivers in Barrington and Warren Rhode Island.  Services included contracting for detailed velocity profiling near each bridge through a […]

Route 9 Bridge Kennebunk, ME

Northstar Hydro, Inc. provided hydrologic, hydraulic and scour analysis to Maine DOT’s contractor for preliminary and final design for proposed replacement of the Route 9 bridge between Kennebunk and Kennebunkport.  Unsteady flow modeling with model HECRAS and field monitoring provided data on water elevations, velocities, and rate of flow through the bridge under a variety […]

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