Challenge
The Village of Sugar Grove, Illinois faced a connectivity challenge where Blackberry Creek acted as a natural barrier between residential neighborhoods south of the Virgil Gilman Trail and the regional trail network to the north. Without a safe crossing, pedestrians and cyclists were forced to use Bliss Road, a busy corridor with limited shoulders and no dedicated pedestrian accommodations.
The project also had to be delivered within a highly constrained footprint. The crossing location was effectively fixed by the geometry and proximity of the Virgil Gilman Trail, Belle Vue Park soccer fields, Forest Preserve property, adjacent stormwater infrastructure, and nearby residential development.
Environmental sensitivities elevated the complexity. The alignment traversed wetlands, floodplain, and forest preserve lands, requiring a design that achieved ADA-compliant grades while minimizing fill and disturbance. Special protections were also needed for sensitive habitat conditions, including roosting bat considerations.
Solution
HR Green served as the prime consultant for Phase II and III Engineering, delivering final design, Plans, Specifications, and Estimates (PS&E), permitting, and construction observation under IDOT/FHWA requirements. The team designed an 80-foot prefabricated steel through-truss pedestrian bridge supported on deep-foundation abutments, paired with approximately 1,220 feet of new asphalt shared-use path connecting Belle Vue Lane to the Virgil Gilman Trail, creating a continuous, ADA-accessible route that integrates seamlessly with existing sidewalks and park facilities.
A stream morphology and hydraulic analysis shaped the bridge opening, grading, and compensatory storage strategy to reflect the creek’s atypical cross-section and preserve flow capacity. The design minimized fill within the floodway/floodplain and incorporated oversized vegetated drainage ditches and compensatory storage to meet local ordinances below the 10-year high water level and between the 10- and 100-year levels. To reduce ecological impacts, the path alignment was slightly meandered to preserve specimen trees. Native native seed mixes and wildlife-friendly erosion control blankets were specified to support restoration and sensitive habitat considerations.
Benefit
The project delivers a continuous, ADA-accessible connection that eliminates reliance on Bliss Road and safely links neighborhoods, parks, and the regional trail network. By tailoring the bridge geometry and floodplain mitigation to site-specific hydraulics and morphology, the Village gained a resilient crossing that preserves conveyance and avoids adverse floodplain impacts. Context-sensitive detailing and restoration measures protected the Forest Preserve setting while improving public access and recreation. The project provides long-term value through safer mobility, stronger community connectivity, and enhanced access to commercial and recreational destinations.
