City of minneapolis i 35w north south storm tunnel s f 194
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City of Minneapolis I-35W North & South Storm Tunnel S.F. 194. 35W North Tunnel Outfall. 35W South Tunnel Outfall. 35W North Tunnel Constructed in 1965 Material – concrete (not reinforced) 8 – 14 foot diameter 9,415 feet / 1.8 miles in length Roughly 80 – 100 feet below the surface

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City of minneapolis i 35w north south storm tunnel s f 194

City of MinneapolisI-35W North & South Storm TunnelS.F. 194

35W North Tunnel Outfall

35W South Tunnel Outfall


35W North Tunnel

Constructed in 1965

Material – concrete (not reinforced)

8 – 14 foot diameter

9,415 feet / 1.8 miles in length

Roughly 80 – 100 feet below the surface

62% Minneapolis Flow / 38% MnDOT Flow

Funding need $5.5 million

35W South Tunnel

Constructed 1961 to 1964

Material – concrete (not reinforced)

8 – 14 foot diameter

24,540 feet / 4.7 miles in length

Roughly 80 – 100 feet below the surface

85% Minneapolis Flow / 15% MnDOT Flow

Funding need - $14 million


35W North Tunnel

Tunnel built to accommodate city storm water that was originally draining to the sanitary system and freeway drainage

Agreements between the City of Minneapolis and MnDOT regarding the tunnel construction and maintenance

35W South Tunnel

Original flow - west to east to the Mississippi River

Freeway bisected the original flow pattern

Tunnel built to accommodate city and freeway drainage

Agreements between the City of Minneapolis and MnDOT regarding the tunnel construction and maintenance


Current bonding request 2012 4 5 million state 4 5 million local

Current Bonding Request

2013 $4.5 million State, $4.5 million Local

Current Bonding Request

2012 $4.5 million State, $4.5 million Local

* Request based on 2006 Tunnel Condition Assessment Report which identified segments of the tunnel and cost estimates.


Deficiencies to be addressed

Groundwater

Longitudinal Cracks

Groundwater

Longitudinal Cracks

Holes in the Liner

Holes in the Liner

Deficiencies to be Addressed

Voids outside the tunnel

Voids outside the tunnel

Liner Failure

Liner Failure


City of minneapolis i 35w north south storm tunnel

  • Solutions

  • Removing sedimentation and debris from the tunnel

  • Sealing open joints, fractures, and cracks

  • Repairing holes and erosion in the tunnel liner

  • Grouting voids outside of the liner

City of MinneapolisI-35W North & South Storm Tunnel

Solutions

Removing sedimentation and debris from the tunnel

Sealing open joints, fractures, and cracks

Repairing holes and erosion in the tunnel liner

Grouting voids outside of the liner


City of minneapolis i 35w north south storm tunnel1

  • Need to manage the condition before it becomes a safety issue

  • The City of Minneapolis needs to continue to take rain water out of the sanitary system and into the storm water system to avoid Combined Sewer Overflows (CSO) and to meet the requirements of the Metropolitan Council Environmental Services (MCES) Inflow and Infiltration (I/I) Program

  • MnDOT supports this work and funding request

City of MinneapolisI-35W North & South Storm Tunnel

Need to manage the condition before it becomes a safety issue

The City of Minneapolis needs to continue to take rain water out of the sanitary system and into the storm water system to avoid Combined Sewer Overflows (CSO) and to meet the requirements of the Metropolitan Council Environmental Services (MCES) Inflow and Infiltration (I/I) Program

MnDOT supports this work and funding request


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