The lake was formed as a result of extensive gravel mining operations in the mid-20th century.
The preserve is a documented site for osprey restoration, with artificial nesting platforms installed to encourage breeding.
It sits atop a significant land reclamation project that transformed industrial extraction sites into high-quality wildlife habitat.
The site features a specific off-leash dog area requiring a separate permit for entry.
The area is an important stopover for migrating raptors during the spring and fall seasons.
Mallard Lake Forest Preserve is a 941-acre site in DuPage County, Illinois, centered around an 85-acre lake created from a former gravel quarry. The preserve features a diverse landscape including wetlands, restored prairies, and mature woodlands. It is a premier destination for birdwatchers, specifically noted for osprey nesting platforms and sightings of rare migratory waterfowl. The site offers a paved multi-use trail that connects to the larger regional trail system. Fishing is permitted on the lake, which is stocked with species including largemouth bass, bluegill, and catfish. Equestrian trails are available for visitors with horses. The preserve acts as an important ecological corridor for local wildlife and contributes to regional flood control.
The osprey nesting platform observation area near the water's edge.
Bring polarized sunglasses to better spot fish and submerged wildlife in the clear lake water.
Check the official DuPage Forest Preserve website for current trail closure alerts caused by periodic seasonal flooding.
Ensure you have the required permit if you plan to use the off-leash dog area.
Attempting to swim or wade in the lake, as it is prohibited for safety and ecological reasons.
Leash laws apply strictly outside of the designated off-leash area; stay on marked trails to protect sensitive restoration zones.
