Lake Street Siphon Inspection

Constructed in 1937, the Lake Street Siphon consists of three 60-inch diameter cast iron pipes. The pipes run from Minneapolis to Saint Paul below the Mississippi River and convey on average of 69 million gallons of sewage daily. TKDA completed a similar condition assessment of the Lake Street Siphon in 1993 and will continue to work with MCES on future evaluations and improvements.

Project features included:

• Designing temporary bulkheads and platforms, HVAC, and electrical improvements to allow access to the sites
• Creating 3D Revit model for the contractor and operations showing existing and proposed changes
• Condition assessment of concrete head house and tail house structures
• Remote inspections of the riverbed using bathymetric, side scan, and sub-bottom surveying
• Remote inspection inside each siphon barrel before manned entry, including 3D laser scanning
• Manned entry into each siphon barrel for visual inspection and ultrasonic thickness testing
• Recommending and developing alternatives for future inspections and rehabilitation
• Creating training videos to demonstrate access and operation of the infrastructure

CLIENT: Metropolitan Council Environmental Services
LOCATION: Minneapolis, Minnesota