Structures & Water Resources
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See how we have helped numerous Government/Public and Commercial/Private sector clients achieve success with their transportation projects.
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What We Do - Structures and Water Resources


 
New England Region

Upper Shawme Dam Design

Town of Sandwich, Barnstable County, Massachusetts

Upper Shawme Dam Design, Sandwich, Barnstable County, Massachusetts McMahon completed final design, environmental and all permitting, and construction management services for rehabilitation of the Upper Shawme Dam. After a Phase 1 Dam Inspection, extensive subsurface, hydrologic and structural analyses were conducted and used to design the dam embankment, spillway, and hydraulics for the dam rehab. A detailed Emergency Action Plan and Operation and Maintenance Manual were written. Numerous applications, permits, and certifications/ licenses were successfully completed and/or obtained during the environmental permitting process, involving multiple state and federal agencies.


Fort Meadow Reservoir Dam

City of Marlborough, Middlesex County, Massachusetts

The City of Marlborough contracted McMahon to complete an Emergency Action Plan (EAP) for the Fort Meadow Reservoir Dam, a classified large, high hazard (Class I) structure, located in the Concord (Assabet) River Basin. McMahon completed hydrologic and hydraulic analyses to develop dam breach hydrographs and subsequent downstream flood routings. The EAP report, which included inundation mapping, notification, warning, surveillance, and evacuation procedures, identification of alert levels, and the definition of responsibilities and duties of the personnel was also prepared.


Inspection and Assessment of Dams for City of Newport, RI

City of Newport, Newport County, Rhode Island

McMahon was contracted by the City of Newport to conduct visual inspections of seven high and one significant hazard water supply dams within the City. Inspections of these dams are required under the Rhode Island Department of Environmental Management (DEM) Dam Safety Regulations. High hazard dams are required to be inspected every two years by a qualified professional engineer and significant hazard dams every five years. Under this contract we performed preliminary reviews of existing data, field inspection of the dams and all appurtenant structures, and developed draft and final reports. The inspection reports included an assessment of the condition and safety of the dam for each dam location. McMahon coordinated with the City of Newport throughout the entire project.

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