The lake was created by flooding a former limestone quarry, resulting in deep, clear water pockets.
The 1.05-mile paved loop around the lake serves as a key connector for the DuPage River Trail.
The preserve is managed by the Forest Preserve District of Will County, not the city of Naperville, despite its proximity.
The off-leash dog park requires a specific permit system to ensure user compliance and safety.
The site hosts a diverse range of waterfowl due to its depth and the surrounding reclaimed prairie habitat.
Whalon Lake is a 249-acre forest preserve featuring a prominent 80-acre lake reclaimed from a former rock quarry. The site offers extensive recreational opportunities including a dedicated off-leash dog area requiring a Forest Preserve District permit. Visitors can access a 1.05-mile paved trail that encircles the lake, connecting to the broader regional trail network. The lake permits non-motorized boating, such as kayaks and canoes, with a seasonal launch area available. Anglers frequently target populations of bass, bluegill, and northern pike stocked within the waters. The preserve includes a shoreline fishing station and a grassy area designated for picnicking. Native plantings are maintained throughout the surrounding meadows to support local bird and pollinator populations.
The pedestrian bridge overlooking the main body of the lake provides a clear panoramic view of the quarry water and surrounding prairie.
Purchase your dog park permit online before arriving if you plan to use the off-leash area.
Bring polarized sunglasses to better spot fish and aquatic life in the clear quarry water.
Check the Will County Forest Preserve website for current water quality or algae bloom advisories before boating.
Do not attempt to swim in the lake, as swimming is prohibited; avoid wandering off the marked trails to protect sensitive native restoration areas.
The dog park requires a permit year-round; preserve gates typically lock at sunset.
Leashed pets are required on trails outside of the designated off-leash dog area; carry out all trash to keep the preserve clean.
