TERRA was retained to provide civil, landscape architecture, surveying, and construction engineering services for the Forest Preserve District of Will County. Whalon Lake is an existing 249-acre forest preserve property that includes an 80-acre lake which was formerly a quarry. TERRA designed two ADA accessible, multi-use path connections to an existing 2.36-mile trail system within the park. The north trail design was coordinated with the Village of Bolingbrook to include a new signalized pedestrian crossing on Royce Road. The new crossing includes solar powered, pedestrian activated flashing beacons to improve visibility for the crossing, along with signage and striping to alert vehicular traffic to the location of the crossing.

The south trail design provides a connection between the Whalon Lake trail system and the Bolingbrook Park District’s Hidden Lakes Park. Located immediately to the south of the forest preserve property, Hidden Lakes Park contains an existing pedestrian bridge that spans the East Branch of the DuPage River. The proposed trail connection uses a custom wooden boardwalk to manage the steep slopes of the river valley to connect to the existing pedestrian bridge on the north side of the river, and provide a transition to an existing trail on the south side of the river. The boardwalk system minimizes the impact on the DuPage River floodplain and existing wetlands on site, while serving as an aesthetic amenity allowing users to ascend the steep slopes through the canopy of existing trees.

TERRA also addressed erosion issues along the shoreline of Whalon Lake as part of their design efforts. The existing grass shoreline is quickly being eroded along the southwest shore. TERRA designed an improved shoreline, utilizing natural stone outcroppings to manage erosion and provide improved pedestrian access and seating opportunities along the water’s edge.


Forest Preserve District of Will County