Water Mains across Little Bay

This project consists of design and construction of 24-inch water transmission mains beneath Little Bay to replace existing mains. Investigations have identified degraded conditions of the existing water mains and valves. Due to the importance of this water main, this project is necessary to ensure water is continuously supplied from Madbury to Portsmouth and service is not disrupted.

Status: In design. Construction over winter 2023 - 2024

Project Manager: Al Pratt, P.E. Water Resource Manager 603.766.1538

Start Date: Design: 2020

Estimated Time of Completion: Design 2023, Construction 2023-24

Estimated Cost: Engineering & Design: $7,945,000 (July 2021 cost estimate)

Funding Source: Capital Improvement Funds and $600,000 EPA Community Grant Funding

Designer/Contractor: Wright-Pierce/TBD


Collins Wellfield Improvement New Groundwater Well

Collins Wellfield Improvement New Groundwater Well

This project resulted from new water supply source investigations. Test wells were drilled in areas around the existing Collins Well to determine the potential for enhancing productions from its associated aquifer. The capacity of the existing Collins Well has declined since it was installed and historical data indicates greater yield potential from this aquifer.

This project will provide an additional well in the Collins Wellfield to provide resilience to this supply source and regain the production capacity of this site to 450 gallons per minute. A pumping test on the new well (Collins Well 2) has been conducted and the consultant is preparing the hydrogeological report for submittal to the NHDES as part of the permitting process.

Status: Collins Well 2 has been constructed and permitting is underway

Project Manager: Al Pratt, Water Resource Manager 603.520.0622

Start Date: January 2019

Estimated Time of Completion: August 2023

Estimated Cost: $524,000

Funding Source: Capital Improvement Funds

Designer/Contractor: Consultant - Emery & Garrett Groundwater Investigations