GLWA Seeks Tunnel Restoration Contractors

Bids are being received until noon on June 6th by the Great Lakes Water Authority for repairs to be made to the Detroit River Interceptor. It was built in 1927 in Detroit’s downtown area as a 14 foot interior diameter tunnel.

The crown of the tunnel varies from 10 feet to 15 feet below the surface. Based on modern inspections the tunnel appears to be of cast-in-place concrete using liner plates, with a thickness of approximately 14 inches. Joe Louis Arena, the Cobo Center, and the Renaissance Center have been built  over the tunnel’s alignment.

Portions of the project include:

• Installation of approximately 1,700 feet of working platforms within the interceptor.

• Removal of an auger obstruction and necessary repairs.

• Restoration of deteriorated joints in the interceptor.

• Restoration of portions of the interceptor’s crown using stainless steel plate and grouting.

• Leak grouting with chemical grout and epoxy grouting of cracks in the tunnel.

Serving as consulting engineer is FK Engineering Associates, Madison Heights. Questions can be directed to Elizabeth Rista at

May 19, 2017