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Feasibility design and inspections of an urban stormwater-management tunnel

About this project

client
Bassett Creek Watershed Management Commission
location
Minnesota
cost
$28 million
completion date
Ongoing

In the late 1980s and early 1990s, Barr and the U.S. Army Corps of Engineers implemented a $40-million stormwater management plan for the BCWMC and the City of Minneapolis as the local sponsor. The plan included replacing the two-mile conduit to the Mississippi River with a combination of a double-box culvert and bedrock tunnel. This tunnel system provides conveyance and flood control for Bassett Creek and drainage for portions of Interstate Highways 394 and 94.

Since construction, Barr has provided periodic inspections and repairs of the tunnel system for the BCWMC and the City of Minneapolis. The inspections consist of evaluating the tunnel for cracking, settlement, seepage, excessive infiltration, concrete deficiencies, exposed rebar, and foundation issues. For example, Barr inspected the bedrock tunnel in 2008 and the entire 5,500-foot double-box culvert section most recently in 2019. Bedrock tunnel inspections are scheduled again for 2020 or 2021.

Key team members

Len Kremer

Water Resources Engineer
Principal Emeritus

Jim Herbert

Vice President
Senior Civil Engineer

Joe Welna

Senior Civil Engineer

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