Engineering

Latest Update 

8/24/2022 Update:
Materials from the Aug. 23, 2022 Public Information Meeting are now available for viewing:
Aug. 23, 2022 Public Information Meeting Recording
Aug. 23, 2022 Public Information Meeting PowerPoint

Project Overview

This project includes dredging the existing Wexford Pond. Over the past decades, sediment has accumulated in the pond, reducing storage capacity and water quality benefits. This project will include maintenance dredging of the entire existing wet ponds, as well as creating stormwater forebays at major outfall pipes that discharge to the pond where sediment tends to accumulate. These forebays will be deeper depressions within the wet pond to collect sediment. This will help keep the sediment from migrating throughout the pond and allow for easier access for maintenance and sediment removal.

Background

The Wexford Pond and Greenway system is located within the Pheasant Branch Watershed, and is part of the Madison Pheasant Branch Watershed Study. Starting in 2021, city staff and Strand Associates collected data, and ran computer models of a variety of storm events and infrastructure improvements concepts to better understand the impacts of Wexford Pond and Greenway within the larger stormwater infrastructure system. This work was performed in conjunction with the Madison Pheasant Branch Watershed Study as part of anticipated increased flooding related to climate change. The results of these models indicated that pond expansion will not dramatically reduce flooding that was experienced in this area until the downstream water conveyance limitations are fixed. As seen in the Watershed Study Flood Risk Map, buildings vulnerable to flooding are concentrated along North High Point Road, Tramore Trail, and Sawmill Road, and not the pond border. This is caused by a variety of factors, but primarily limited pipe capacity at beltline culverts and decreased capacity downstream in the Old Sauk Trails Business Park. At this time, any improvements that increased the capacity of Wexford Ponds without prior improvements to downstream infrastructure, would only displace flooding and not provide additional storage. Downstream projects are proposed with the Capital Budget and once complete, are anticipated to reduce flooding experienced in this area during the 2018 August storm events. Therefore, at this time immediate improvements to Wexford Ponds will be to address water quality through sediment dredging.

Project Schedule

The tentative schedule is as follows:

Planning, Modeling, Analysis, and Conceptual Design: 2021-2022

Grant application for additional funding: April 2022, this project was not awarded grant funding.

Design Development: 2021-2022

Construction Bid: 2022/2023

Construction Start: 2023

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, times and locations are indicated below:

Public Information Meetings

Aug. 23, 2022 Public Information Meeting Recording
Aug. 23, 2022 Public Information Meeting PowerPoint

City Meetings, Process

Board of Public Works: May 19, 2021 – Amendment to contract Scope of Services