The Gary/Kehoe Reservoir is a 140 acre-ft capacity gravity controlled reservoir located on Tributary No. 2 to Klein Creek, near the intersection of Gary Avenue and Kehoe Blvd in Carol Stream. The reservoir includes a dam at the northwest corner of the reservoir. The dam is comprised of an earthen embankment that is approximately 20-feet high, and includes a concrete inflow spillway structure along Kehoe Blvd. As water surface elevations in the channel increase, water begins to spill over the concrete spillway into the reservoir. As water surface elevations decrease, the reservoir drains via gravity through an 18-inch diameter outlet culvert.
Construction of the reservoir was completed in 1999. It was one of the recommended flood control projects in the Klein Creek Flood Control Study and Watershed Plan that was adopted in 1994.