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 […]

Androscoggin River Bridge Replacement in Durham and Lisbon

The existing Route 9/125 Bridge over the Androscoggin River at Durham/Lisbon Falls was recently replaced. The bridge is located approximately 1200’ downstream of the Worumbo Dam and spans the narrowest segment of the river. The bridge is founded on rock at both abutments and at the piers on rock islands. A channel that carries flow from […]

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 […]

VTrans Culvert H&H Analysis, VT Statewide

Northstar Hydro has conducted numerous hydrologic and hydraulic analysis of culverts for Towns throughout Vermont.  Projects are initiated when the Town requests a review of replacement alternatives for specific culverts through VTrans.  Northstar Hydro conducts a site visit, confers with local officials, assesses hydrologic flow, and recommends several culvert sizing alternatives based on hydraulic and environmental standards. […]

Town of Brownville Junction, Culvert Replacement with Fish Passage

Northstar worked with Dirigo Engineering to provide hydrologic and hydraulic engineering at the stream crossing of Front Street in Brownville Junction, Maine. The Town of Brownville proposes to replace the Front Street culvert, removing the existing undersized, perched structure with a larger hydraulically sufficient culvert that would also restore aquatic passage at the site. The existing […]

Design-Build: I-91 Twin Bridges over Williams River in Rockingham, Vermont

Northstar Hydro is part of the Design-Build Team of Reed and Reed and HDR for the replacement of the twin bridges that carry I-91 over the Williams River in Rockingham, Vermont.  NHI provided hydrologic, hydraulic, and scour analysis Northbound and Southbound (NB and SB) bridges  Work completed included hydrologic analysis, hydraulic modeling, and scour analysis […]

Boombridge Bridge, Greenbush Maine

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 […]

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

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

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 […]

Copyright by Northstar Hydro, Inc., 2017