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

To date, Phase I work has included excavation and disposal of unsuitable material, construction of the overflow weirs, complete construction of both reservoirs, and restoration of the bottom of both reservoirs with seed and wetland plant plugs. All storm sewer within Armstrong Park has also been installed and a stone base for the path on top of the pump station reservoir is complete. Installation of the permanent concrete mats has continued, and approximately 4/5 of the mats are installed on the inside slopes of the pump station reservoir for erosion protection. The contractor began spreading topsoil over the revetment mats this week; the project is expected to be complete by August.  Overall, this phase is approximately 92% complete.

Phase II

Work in this phase is focused on construction of the pump station. The pump station has been completely constructed; all concrete has been poured, building up from the footing by constructing the lower walls, upper walls, and finally the top deck. Two large pumps and many of the electrical components inside the building have been installed. A majority of the remaining work for this phase includes installation of the remaining electrical components. This phase is currently considered approximately 93% complete. 

Phase III

The 60" siphon pipe has been installed starting at Armstrong Park, under a private property, under Illini Drive, under Indianwood Drive, and under another private property where it connects to a newly constructed swale. In total, 2,200 feet of 60" siphon pipe has been installed. At the outfall of the siphon pipe, the energy dissipation structure has also been constructed. This will slow down the water coming out of the pipe and prevent erosion of the newly constructed swale that connects with Klein Creek. Restoration has been completed in this Phase, which includes installation of all plant plugs, placement of native seed and erosion control blanket, and planting of trees and shrubs. This phase is 98% complete.

Planning Exhibits


Klein Creek Watershed Plan

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