DECC Dockwall Rehabilitation

Location: 
Duluth, MN
Completed: 
Estimated 2019
Estimated Cost: 
$8,000,000

· Connected Canal Park to Bayfront Park, linking city trail system

· Provided safe loading platform for cruise vessels

· Improved public safety along the dockwall

·Multi-functional dockwall design for events

·New bike path and boardwalks

This project includes the rehabilitation of a historic 1865 Minnesota Slip and Harbor dockwall which are home to the William A. Irvin, Vista Cruises and waterfront boardwalks that host millions of tourists annually.   As the Project Manager, AMI Consulting Engineers took the lead in both stakeholder and private meetings to address the issues along the 2500 linear foot dockwall and surrounding public areas.  AMI created the presentations and complete 3D renderings for these meetings. The project is in a highly-traveled tourist area and AMI worked closely with the City of Duluth, DECC and the current businesses located along the project site to meet the needs of all parties. 

In the initial stages, AMI performed emergency investigations and rehabilitation planning for multiple sections of the harbor wall and dockage.  During the underwater investigation, serious decay and failures of the dock wall were found in critical public areas along the DECC and MN Slip. The decay and failures have resulted in public safety and environmental risks, as well as reduced accessibility to Duluth’s waterfront and the historic William A. Irvin.

With these factors in mind, AMI Consulting Engineers provided all the engineering for new dockwall structures to replace the old and failing timber dock wall.  This design included site renderings, complete plan set and specs, cost estimating and demolition planning for the dockwalls and the surrounding tourist areas to minimize construction impacts on streets, the new steel sheet piling dock wall and tie back system utilized transfer plug and helical anchors.  New bollards and their foundations were also designed to accommodate the facilities needs from vessel traffic, along with the design of a temporary vessel docking platform.

The rehabilitation included of a complete environmental investigation of the area behind the existing dockwall and building for demolition, all permitting for the site, electrical utility upgrades for the Irvin and Vista Cruises, corrosion protection and reinforcement panel system, wood boardwalk, asphalt trail, and concrete gathering space. AMI is also working in conjunction with MPCA/ EPA/ USACE for slip restoration and clean-up.

This project is expected to be complete in 2019, with AMI as the lead Project and Construction Manager throughout the process.