Lake Renwick Preserve
After the quarries were closed in 1983, the areas of below-water-table elevation filled with water, and the resulting lakes were sold to the county forest preserve district and the Illinois Department of Natural Resources in 1990 for use as open space."[1] Bird lovers have constructed a series of artificial nesting structures on a network of small islets within one of the lakes.Unsupervised visitation by the public to most of the preserve is banned from March until mid-August to prevent disturbance to nesting birds.[1] During the non-nesting months, the public often uses a 2.9-mile (4.6 km) system of trailways throughout the preserve area, the Lake Renwick Bikeway.[4] During the nesting months, those interested in supervised birdwatching are urged to make prior arrangements with the Forest Preserve District and its guides.