McKenna Blvd. Flood Mitigation Project

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Last Updated: 10/07/2020

Latest Update

10/7/2020 Update: 

Phase 1 of this project was completed in May 2020. Phase 2 street construction was completed in August 2020 and Schroeder Rd. re-opened to traffic on September 1st. Phase 2 channel construction is ongoing and is expected to be completed late fall 2020.

Project Overview 

Phase 1 

The east Park Edge Dr. neighborhood consists of several cul-de-sacs that back the City of Madison's West Badger Mill Creek - Elver Park Greenway. That greenway carries water from Greentree Pond north of the neighborhood and discharges via pipes under McKenna Blvd. to Elver Park. The associated watershed is approximately 1.4 square miles in area, and drains from north to south.Since 2016, Park Edge Dr. residents have experienced several rain events where water from the greenway flooded the neighborhood and entered their residences. Additionally, McKenna Blvd., which is a main thoroughfare through the neighborhood and houses police and fire stations for the west side of the city, has overtopped and become impassible several times. On December 13, 2018 the City hosted a Public Informational Meeting held at Our Redeemer Church on McKenna Blvd. A copy of the presentation can be found here. Staff discussed the flooding that occurred in June and August of 2018, design standards, watershed modeling, and the proposed public works contract. City Engineering is proposing a public works improvement to address the recurring flooding. The City evaluated the greenway during the design process and plans to construct improvements that will reduce the impact of flooding in the Park Edge neighborhood and alleviate flooding from the greenway onto McKenna Blvd.

Staff have analyzed the watershed and propose replacing the existing pipes under McKenna Boulevard with a twin cell 5’ tall by 10’ wide box culvert and a twin cell 5’ tall by 12’ wide box culvert, which includes constructing new inlet and outlet wing walls. The existing concrete channel will be removed and replaced with a concrete channel 1.5 feet lower than its current level. A retaining wall will also be constructed along the west edge of the greenway to provide improved flow capacity in the channel that runs adjacent to Greentree Landfill. The existing metal culverts at the outlet of Greentree Pond are in very poor condition and will be removed and replaced with a twin cell 4’ tall by 8’ wide box culvert as part of this project. The pond outlet and channel will be realigned to point southwest, rather than west, to alleviate flows going directly towards Falmouth Ct. All aspects of the design can be found in the final plan set for the project, here: Final Plans

Phase 2 

The City of Madison's West Badger Mill Creek - Elver Park Greenway crosses Schroeder Road near the intersection with Struck Street and carries water south to Greentree Pond before flowing under McKenna Boulevard to the Elver Park pond. The associated watershed is approximately 1.4 square miles in area, and drains from north to south.Since 2016, residents along this section of greenway have experienced several rain events where water from the greenway flooded streets, homes, and businesses. On December 13, 2018 the City hosted a Public Informational Meeting held at Our Redeemer Church on McKenna Boulevard. A copy of the presentation can be found here. Staff discussed the flooding that occurred in June and August of 2018, design standards, watershed modeling, and the proposed public works project. City Engineering has proposed a two phase public works improvement to address the recurring flooding. Phase 1 of the project runs from Greentree Pond to Elver Park and is described in greater detail below. It is expected to be completed by the end of May 2020. Phase 2 of the project runs from Greentree Pond to north of Schroeder Road and addresses flooding that impacts Schroeder Road, as well as residences and businesses along Struck Street. The City evaluated the greenway during the design process and plans to construct improvements that will reduce the impact of flooding along the greenway.

Staff have analyzed the watershed and propose replacing the existing pipes under Schroeder Road with two 8' wide by 4' tall box culverts, which includes constructing new inlet and outlet wing walls. The existing concrete channel north of Schroeder Road will be removed and replaced with a natural channel. The entire greenway channel extending from Greentree Pond to 840 feet north of Schroeder Road will be lowered 1.5 feet to improve the stormwater conveyance of the channel. The existing metal culverts at the inlet to Greentree Pond are in very poor condition and will be removed and replaced with reinforced concrete pipes of the same size. Phase 2 was analyzed together with Phase 1 as part of the design process to ensure that both phases work together to meet the flood mitigation goals for the entire stretch of greenway that extends south to Elver Park. All aspects of the design can be found in the final plan set for the project, here: Final Plans

Project Limits 

Street construction at Schroeder Rd.-Struck St. intersection and 300 feet to the west along Schroeder Rd. (complete); channel construction along greenway from Greentree Pond to 800 feet north of Schroeder Rd. (ongoing).

Project Schedule 

Phase 1 Schedule 

Permit application approval: May 2019.
Bid opening: June 2019
Contractor selection: June 2019 
Construction began: July 2019 

Phase 2 Schedule

Permit application approval: January 2020, May 2020.
Bid opening: April 2020
Contractor selection: April 2020.
Construction began: June 2020 
Scheduled completion: this information will be posted when available.

*During construction there will be a full closure of Schroeder Road at the intersection with Struck Street for the duration of the project, which is expected to end by mid to late-August. Metro service on Struck Street and Schroeder Road, between Gammon Road and Rayovac Drive, will be detoured along Watts Road and Rayovac Drive during construction. Bus stops at the corner of Struck St. (SB) & Watts Rd., Schroeder Rd. (EB) & Struck St., and Schroeder Rd. (EB) & Chapel Hill Rd. will be temporarily closed during construction. All bus stops located Watts Road and Rayovac Drive will remain open for the Metro service detour.

Public Involvement 

There are a number of points of contact during this project where the public is encouraged to give feedback as part of public information meetings and public hearings. Dates and times are indicated below:

Public Information Meetings

A public information meeting was held Dec. 3, 2018. 
Dec. 3, 2018 Public Information Meeting PowerPoint Presentation 

City Meetings, Process

Board of Public Works: March 4, 2020
Common Council: March 17, 2020