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 in spring 2015.

Construction Updates

Phase I

Earthwork has continued with importing material to continue construction of the clay core of the gravity basin. To date, approximately 50% of the core has been installed. Dewatering of Lake George also continued, and unsuitable material was removed from the area. Stockpiles of topsoil were delivered to the site, to be spread in future weeks. Next week, construction of the clay core is expected to continue (including import of more clay material) along with removal of unsuitable material.

Phase II

Our contractor poured the base slab of the Pump Station and backfilled the area accordingly. Concrete footings were also poured for the south weir. Forms and rebar are currently being installed for construction of the lower walls of the pump station. Concrete is currently anticipated to be placed mid-week next week for the lower walls. Rebar will also be installed for the south weir in preparation for pouring concrete.

Phase III

By Friday, August 8, approximately 200’ of casing pipe is expected to be installed under the intersection of Arrowhead & Illini and the private property. The 60” ductile iron pipe is on site and will be installed starting next week. Our contractor expects to be finished with installation of the 60” siphon in this area by next Friday (8/15) or the following Monday (8/18). Our contractor identified a gas leak yesterday late afternoon, which was repaired overnight by Nicor. Although this interruption caused the crews to stop work yesterday, there is no expected delay in schedule. Precision Boring is on site today and also plans to be on site tomorrow (Saturday 8/9) to continue boring.

Planning Exhibits


Klein Creek Watershed Plan

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