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 98% complete. The two reservoirs are completely constructed, all storm sewer has been installed, asphalt has been placed for the multi-use paths and parking lot, and most of the restoration is complete. Wetland plant plugs have been planted in the bottom of both reservoirs, a majority of the site has been seeded, and the shoulders along the newly constructed paths have been restored with soil, seed, and erosion control blanket. Crews are currently working on a few remaining items to clean up the site and installation of trees and shrubs is expected to begin in September.  

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. County personnel have been trained on the equipment.  A few items still need to be programmed into the new control system and a few tests need to be performed.  Once these tasks are completed, the facility will be fully operational and the County will be able to operate it as designed. 

Phase III

Phase III consists of installation of 2,200 feet of 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 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 outlets into a swale that was constructed to reconnect with Klein Creek. 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 has taken over the long term management of this area as required by the permits for the project.

Planning Exhibits


Klein Creek Watershed Plan

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