Tomahawk Creek is a stream that is part of the Blue River watershed and originates near 143rd and Greenwood in Johnson County. It flows east towards Route 69 before heading northeast through Leawood until it joins with Indian Creek near Mission Road and College Boulevard. At this point Indian Creek continues east until it joins the Blue River near Bannister Road.
The Urban Monitoring Network consists of three sites on Tomahawk Creek. The most downstream site (Site 1) is located east of the Tomahawk Creek Parkway and North of 119th Street. The middle site (Site 2), is located west of Metcalf and north of 133rd Street. The uppermost site (Site 3) is located just to the West of 139th Street and Switzer.
Urban land use (developed) in the lower, middle and upper watersheds is 68.3%, 57.2% and 50.0%, respectively. Percent impervious cover is 18.8%, 20.0% and 19.9% for the lower, middle and upper watersheds, respectively.