Western North Ridge Stormwater Improvements Phase I

Last updated Jun. 13, 2018 - 12:33 pm
  • Planning
  • Design
  • Construction
  • Completed
  • Storm Drainage System
  • $2.3 million
  • Stormwater Management (Lead)
  • Dewberry (Engineering Consultant)

Current Activity

Posted Wednesday, June 13

The project's engineering consultant, Dewberry, is working on additional modeling and gathering project data for the design phase of this project, which is currently underway.


This project will improve the storm drain system:

  • Along Tanbark Way (near the intersection of Pinebark Court);
  • At crossings on Harps Mill Road (between Tanbark and Plateau Lane as well as between Plateau and Fiesta Way); and,
  • At the pipe crossings along the 7300 block of Grist Mill Road.

Improvements will be made in this area where the stream channel is restricted and where there is severe erosion. The downstream channel also will be repaired to address flooding and stream erosion concerns along this portion of the stream.

The project may also include water quality improvements to meet regulatory requirements and to address water quality concerns within the Perry Creek Watershed. This includes creating a wetland and enhancing stormwater quality devices that are already upstream.




  • *Roadway overtopping of Grist Mill Road. Roadway overtopping of Grist Mill Road.
  • *Grist Mill Road and right of way flooding. Grist Mill Road and right of way flooding.
  • *Private property flooding. Private property flooding.
  • *Yard and channel flooding. Yard and channel flooding.
  • *Dated and undersized stormwater infrastructure off Harps Mill Road. Dated and undersized stormwater infrastructure off Harps Mill Road.


Project schedule with dates and descriptions
Fall 2017Project design modeling for Phase I underway
Spring 2018Project design for phase I begins
Late Fall 2018Project design for phase I complete
Spring 2019Phase I construction begins
Spring 2020Phase I project construction complete


This project is located along the western drainage basin to the North Ridge Country Club Lake, which is in the Perry Creek Watershed.

A history of flooding events in the area resulted in public meetings in April and June 2006, which initiated this stormwater project. An engineering study was completed in December 2006, which recommended improvements to the existing storm drainage systems at Tanbark Way, two locations on Harps Mill Road, and the system crossings at Grist Mill Road.

The goal of the project is to reduce street and structural flooding and provide Tanbark Way, Harps Mill Road, and Grist Mill Road with a 10-year level of service (stormwater devices account for a storm that has a 1 in 10 chance of occurring in a given year). The project also will improve water quality of the Perry Creek Watershed.

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