The County of DuPage
Wheaton, Illinois

Klein Creek Flood Mitigation Project

Klein Creek Rendering

The Klein Creek Flood Mitigation Project began early June 2014. The project along Klein Creek in Armstrong Park, located in Carol Stream, is a joint effort between DuPage County Stormwater Management, the Village of Carol Stream and the Carol Stream Park District to alleviate flooding in the area. In order to do this,DuPage County will construct a two-reservoir system that will operate when water elevations in Klein Creek increase in order to divert floodwaters from the majority of the nearby Armstrong Park neighborhood. Reservoir One will take in water directly from Klein Creek and upon reaching a specific elevation, water will be pumped into Reservoir Two-a much larger storage reservoir.

Construction has been split into three phases. Phase I includes construction of a gravity-operated flood control reservoir to detain floodwater, as well as construction of a larger storage reservoir with a pump station located where the southern portion of Lake George is today. Phase II involves construction of the pump station to move water from the gravity-operated reservoir into the larger storage reservoir. Finally, Phase III includes installation of a 60-inch siphon under Arrowhead Trail, Indianwood Drive and Thunderbird Trail to convey water from the reservoirs back into Klein Creek once river elevations have subsided following flood events. Construction of all three phases is expected to be completed by July 2015.

Construction Updates

Phase I

Phase I, which involves construction of two reservoirs, a multi-use path system, storm sewer installation, and restoration, is approximately 96% complete. The two reservoirs are completely constructed, all storm sewer has been installed, asphalt has been placed for the multi-use paths, and restoration is underway. Wetland plant plugs have been planted in the bottom of both reservoirs and a majority of the site has been seeded. Crews are currently working on restoring the shoulders of the multi-use path with seed and erosion control blanket. Remaining work will include paving of the existing parking lot at the entrance to the park (within the next few weeks) and installation of trees and shrubs this fall.

Phase II

Phase II includes construction of the pump station that has been designed to move water from the gravity reservoir that accepts floodwater from Klein Creek, to the larger storage reservoir constructed on the western portion of Armstrong Park. This phase is 96% complete. The pump station is fully constructed and all pumps have been installed. The contractor is currently working on completing set up of all electrical components within the pump station and completing the necessary tests before the system is considered fully operational. Training for County personnel is expected to take place this week. Once all training has taken place and the system is fully operational, the County will be able to operate the facility as designed. Final Completion of this phase is expected by August 2015.

Phase III

Phase III consists of installation of a 60" siphon pipe that drains water from the larger reservoir at the park to convey floodwater back into Klein Creek once river elevations have subsided following flood events. The County is currently closing out this portion of the project. The 60" pipe has been installed starting at Armstrong Park, under a private property, under Illini Drive, under Indianwood Drive, and lastly under a private property where it connects to a swale that was constructed. In total, approximately 2,200 feet of pipe has been installed. An energy dissipation structure, designed to slow down the water out of the pipe, is constructed near the swale, and restoration has been completed. Wetland plant plugs in addition to a few trees and shrubs have met the requirements of the contract by passing a 30-day mandatory establishment period. The County expects to take over management of this area starting next week.

Planning Exhibits


Klein Creek Watershed Plan

The Klein Creek Watershed Plan Addendum No. 2 was included in West Branch DuPage River Interim Watershed Plan.