Bridges – Page 2 – Northstar Hydro, Inc.

Boombridge Bridge, Greenbush Maine

UpstreamBoombridge BridgeDownstream to Penobscot River This project involved hydrologic and hydraulic evaluation of Bridge #3587 for the replacement of Route 2 over Boombridge Brook in Greenbush, Maine. The work was prepared for CLD as part of their preliminary design work for the Maine DOT on a replacement bridge. The bridge is located just upstream of the confluence of Boombridge Brook with the Penobscot River. The bridge is subject to backwater flooding from the Penobscot River during high water events on the river. A large low swamp or wetland area upstream of the bridge serves as floodplain storage for floodwaters from…

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Cumberland and Bridge Street Bridges over Presumpscot River in Westbrook, Maine

Northstar Hydro, Inc. worked with Stantec and the Maine Dept. of Transportation on the replacement of several bridges on the Presumpscot River in downtown Westbrook, Maine. Northstar provided hydrologic, hydraulic and scour engineering services in association with the replacement of the twin Cumberland Street Bridges and the Bridge Street Bridge. The Cumberland Street twin bridges are located directly upstream of the Sappi Mill dams, fishway and production buildings. Both the dams and the buildings affect flood waters downstream of the twin bridges. Hydraulic modeling required detailed understanding of flow through the complex mill dam system and buildings.

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Design Build: I-91 Twin Bridges over West River, Brattleboro, VT

Aesthetic Design-Build Bridge over Famous Kayaking River Subcontractor for hydrologic, hydraulic and scour design services for design-build replacement of I-91 bridges over West River in Brattleboro, Vermont. Design included evaluation of complex pier scour, potential ice effects, and potential for rock scour for major highway bridge over medium sized river. Subcontractor to FIGG Bridge within Design-Build team

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Bass Harbor Bridge, Tremont, ME

Tidal 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 the bridge is Bass Harbor Marsh, much of which is within Acadia National Park. Hydraulic modeling was designed to provide understanding of flow rate and tidal prism in the Bass Harbor Marsh and to understand the impact of the existing and proposed bridges on…

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Oceanville Bridge, Stonington, ME

Tidal causeway and bridge connecting islands 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 how flow tides interact with the existing and proposed bridges. The first photo shows the site location and the second photo shows the existing bridge.