Experience
Bridges, Dams, Scour, Flood Plain Studies, Hydraulic Studies, Stormwater Management - Roads, Railroads, Parking
St Croix River Crossing, Calais-St. Stephen Border Crossing
Scour evaluation for new bridge crossing at Calais-St Stephen based on site conditions encountered during construction of new bridge, evaluation of 2 piers for scour and possible foundation modifications.
Hydraulic Analysis, Bartlett Bridge, Route 16, New Portland, Maine.
Hydrologic and Hydraulic Analysis for replacement bridge just upstream of privately owned hydroelectric dam. Bridge had experienced overtopping and was poorly aligned for both traffic and streamflow. HECRAS model for bridge hydraulics.
MMAPMOD Program, Maine State Planning Office, Office of Flood Plain Management
Assistance with FEMA's Map Modification program for updating Flood Insurance Rate Maps in several Maine counties. Public information sessions and data gathering for digital map updates. Also assistance with EO 11988, relating to use of Federal Funds in Flood Prone Areas.
MBTA Greenbush Ave Extension, Hingham, MA
Peer review of box culvert design and slope failure on Monatiquot Brook and Bound Brook associated with construction/reconstruction of new MBTA line to Hingham, MA. Hydraulic analysis, and scour study.
Letter of Map Revision for Condominium Development in Bethel, ME.
Study of floodplain and floodway impacts for new condominium development on Twitchell Brook. Study included revision of existing FEMA map, Letter of Map Revision (LOMR) and conditional letter of map revision for post-developement condition of fill in floodplain. No impacts were found to floodplain or floodway.
Union Branch Railway Extension, Portland Maine. HNTB, Inc.
January 2001 – December 2002
This
project involved developing a two-dimensional flow analysis model of
the Back Cove area of Portland, Maine waterfront as part of the planned
northerly AMTRAK extension. Northstar Hydro, Inc. prepared the
hydraulic model to analyze the effects of a proposed new railroad
bridge on the nearby Route 295 Bridge, and on Back Cove tidal cycles.
The hydraulic analysis also was designed to analyze potential scour for
over 25 pile bents. The scour analysis included potential scour in
rock for seating of piles.
Hydraulic Analysis of Veterans Memorial Bridge, Auburn/Lewiston.
October 2003 – December 2004
This hydraulic study analyzed the effects of a proposed pedestrian walkway on floodway and water levels in the Androscoggin River in the vicinity of the Veteran’s Memorial Bridge. The walkway is proposed to be in the floodway, and design concerns also include scour and erosion control at the site. The study utilized hydraulic model HECRAS.
Route 27 (Norton Bridge) Replacement, Kingfield, ME.
April 2002 – December 2002
This project involved hydrologic and hydraulic analysis of the existing and proposed Route 27 Bridges , including evaluation of design alternatives, and impacts on water levels, velocities and scour potential. Northstar Hydro served as sub-consultant to URS on Maine Dept. of Transportation project to replace the Norton Bridge in Kingfield, which crosses the West Branch of the Carrabasset River.
2001
Northstar Hydro, Inc. worked with DMJM Harris for a design-build project on the outside of a bend in the Delaware River. The project involved reconstruction of portions of Route 29 in Trenton, NJ including a location where a new ramp was located in the floodplain on the outside of a river bend. The project was under construction, but outstanding design issues on scour dictated extremely fast track scour analyses and design input for 4000’ of scour wall. The analysis was not typical nor were methods described in standard documents HEC-18, HEC23 or others. We worked directly with one of the authors of HEC-18 to develop analytical methods to predict and account for potential scour on the wall, all under extreme time pressure.
Nash Stream Bridge Replacement, in Coplin Plantation, ME
March, 2002-September, 2002
Using model HECRAS, this study involved the hydrologic and hydraulic analysis of the existing and proposed bridges, including evaluation of design alternatives. The study evaluated impacts on water levels, velocities and scour potential. Northstar Hydro served as a sub-consultant to VHB on Maine Dept. of Transportation project to replace the Nash Stream Bridge in Coplin Plantation for the crossing of Route 16,
Route 2, Pleasant River Bridge Replacement and Bog Brook Bridge Replacement in Bethel and Gilead, Maine.
2001-2004
As part of MDOT’s repair and replacement of Route 2 in Bethel and Gilead, studies were conducted for the replacement of bridges over the Pleasant River and at Bog Brook. The studies included hydrologic and hydraulic analysis of existing and proposed bridges, including evaluation of design alternatives, and impacts on water levels, velocities and scour potential. Sub-consultant to T.Y. Lin International.
Scour Susceptibility Evaluations, over 60 Maine Bridges
2000 -2001
Northstar Hydro served as member of T.Y.Lin’s engineering team under contract to MDOT to conduct field and office review of over 60 State- owned bridges for susceptibility to scour, including geomorphologic review, review of inspection and design files, bed material probes, and overall site review to recommend NBIS rating for each structure for potential for scour or current status related to scour.
Drainage, Stormwater Management Systems, Best Management Practices Designs, Various State of Maine Roadways - Ongoing.
2001-present
Northstar Hydro serves as a sub-consultant on numerous MDOT highway and arterial design projects throughout Maine. Design services include hydrologic/hydraulic analysis of cross culverts, bridges, closed stormwater management systems, and Best Management Practices. Northstar Hydro provides drainage reports, drainage layout, BMP design, and designs of permanent erosion control plans in accordance with MDOT policy and ME DEP policy for stormwater management. Projects include:
- 11 miles of Route 2 in Bethel-Gilead, Maine
- Payne Road Bridge in S. Portland
- The new (third) bridge in Augusta (Route 3 connector)
- Route 100, Falmouth
- Route 1B, Main Street, Damariscotta
- Route 1 in York and South Portland
- Route 201 in Farmingdale
- Route 9 in Aurora-Osborn and Amherst- Aurora
- Mount Auburn Avenue Bridge in Auburn and Lewiston
- Route 98 in Old Orchard Beach
- Route 11 in Limerick, Route 196 in Lisbon
- New Route 1 border crossing in Calais-St Stephen
- Route 215 in Damariscotta Mills
Preliminary Design Layout of Stormwater Managment system, and BMPS for new National Park Visitors Center at the Acadia Gateway Site. Layout for roads, parking, busways, bus washing, visitor services, recommendations under new DEP stormwater rules.
Route 3 Augusta, 3rd Bridge, Augusta, ME
2002-2003
Northstar Hydro, Inc. worked with HNTB and MDOT on the stormwater management and BMP design for the approach roadways to the new Augusta 3rd Bridge. The project involved over 5 km (3.1 miles) of new roadway, including an interstate interchange, several at-grade and overpass intersections, as well as connection to a new large river crossing. Unique water quality design features included numerous cross culverts, fish-passage, sediment traps, level spreaders, and a detention pond and spillway. The large sediment pond included exfiltration as primary outlet. One culvert design included stream relocation and stream reconstruction to assure safe fish passage.
Route 9 Aurora – Amherst and Aurora Osborn
2001-2002
The Route 9 project included 5.1 km or roadway reconstruction with minor alignment changes and provision of truck lanes. Route 9 spans a large undeveloped section of Maine’s woods and carries a heavy volume of commercial and tourist traffic. The project area includes very high quality surface water streams, as well as identified “fish” streams.
Northstar Hydro worked with HNTB and MDOT’s environmental division to develop an improved BMP for roadside ditch sediment basins. The design expanded on the MDOT standard to include further consideration for roadside safety, constructability and maintenance. Sloping considerations were made to account for clear zone requirements. Inlets and outlets were further aligned with ditch lines for constructability. Placement of basins near access points for maintenance crews and modified outlet designs aided with maintainability. The coordination of drainage design with highway elements and the requests of MDOT resulted in the successful implementation of this BMP. The picture illustrates one of the constructed sediment traps on Route 9.
Mount Auburn Avenue Bridge, Auburn, ME
2002-2003
This project included design of the stormwater management system for the new connector bridge at the intersection of Turner St (Route 4) and Mount Auburn Avenue in Auburn. The project is in an urban area and storm drains connect into an existing closed drainage system. The project also encroached on an existing detention area and compensation for loss of this storage area was needed. To assure that post-construction flows did not exceed pre-development conditions, several areas were designed for ponding of surface water with limited capacity for release. One area was landscaped with wetland vegetation and created a small, attractive marshy area within a ramp area. Stormwater management was significantly improved with this project. Model Hydrocadâ and model Hydraflowâ were used for stormwater modeling.
Drainage, Stormwater Management Systems, and Best Management Practices Designs, Various State of Maine Roadways - Ongoing.
2001-present
Northstar Hydro serves as a sub-consultant on numerous MDOT highway and arterial design projects throughout Maine. Design services include hydrologic/hydraulic analysis of cross culverts, bridges, closed stormwater management systems, and Best Management Practices. Northstar Hydro provides drainage reports, drainage layout, BMP design, and designs of permanent erosion control plans in accordance with MDOT policy and ME DEP policy for stormwater management.