Harbor Oaks/Longboat Storm Drainage Improvements

Harbor Oaks Drive Channel Stabilization

This project is located in the Harbor Oaks Estates Subdivision at the end of Harbor Oaks Drive and Theresa Drive, both outlets of which drain to the same channel. These two storm sewer outlets and the existing channel is experiencing significant head cutting, erosion, and unstable banks which is impacting the existing storm sewer infrastructure and private properties. The intended project would stabilize the channel banks, include drop structures and/or check dams to dissipate the velocity of water and reduce the head cutting and stabilize the downstream channel. The exact practices and project limits will be further determined during the design phase, however, a map showing the general location of the intended improvements can be viewed here (PDF). This channel flows from this project area onto the U.S. Army Corp of Engineers property and into Saylorville Lake.

View the Harbor Oaks Neighborhood Letter (PDF). 

The Harbour Subdivision Channel Stabilization

This project is The Harbour subdivision at the ends of NW 70th Court, Longboat Court and Tenacity Lane. Two existing storm sewer outlets drain into one channel which is experiencing significant head cutting, erosion, and unstable banks which is impacting the existing storm sewer infrastructure and private properties. The intended project would stabilize the channel banks, include drop structures and/or check dams to dissipate the velocity of water and reduce the head cutting and stabilize the downstream channel. The exact practices and project limits will be further determined during the design phase, however, a map showing the general location of the intended improvements is attached. This channel flows from this project area onto the U.S. Army Corp of Engineers property and into Saylorville Lake.

View the Longboat Neighborhood Letter (PDF). 

Project Area Map

View the map and construction plans (PDF)

Schedule
Construction will begin in late May 2022 and is expected to be completed by September 30, 2022. 

Contractor
Raccoon Valley Contractors, Waukee, Iowa

Contacts

Brody Buskohl, Construction Inspector, 515-278-0822, bbuskohl@cityofjohnston.com
Steve Klock, PE, Snyder and Associates Project Engineer, 515-964-2020, sklocke@snyder-associates.com
David Wilwerding, Community Development Director, 515-727-7775, dwilwerding@cityofjohnston.com