All – Page 3 – Northstar Hydro, Inc.

Town of Bridgton, Hydrologic Analysis for Dry Fire Hydrant ISO Certification

Determined water supply for firefighting to improved insurance certification The purpose of this project is to evaluate whether the 23 dry hydrants within and adjacent to the Town of Bridgton meet the certification requirements under the Insurance Services Office’s (ISO) Public Fire Suppression Rating Schedule. The certification requires that the water source have the ability to flow 250 gallons per minute (gpm) for a two hour period under the 50-year drought condition. Thus under the 50-year drought condition each ponded source must have 30,000 gallons or 4,010 cubic feet of water available. At the time of this report Bridgton did…

By nicki_16

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

By nicki_16

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…

By nicki_16

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.

By nicki_16

Cobbossee Watershed District, Winthrop, ME

Older dam modifications were causing property damage, dam was redesigned after hydrological study Northstar prepared a hydrologic and hydraulic study of the Maranacook Lake watershed and the outlet dam. The study was designed to understand flow through the watershed, outflow through the dam and potential modifications to the dam to improve lake level management options. Residents along the lake have been experiencing higher lake levels since the dam was reconstructed several years ago. Northstar constructed a HECHMS model of the watershed, and a HECRAS hydraulic model for the bridge and dam . Northstar continues to work with the designer, the Towns…