HKA completed a Feasibility Study Report for the widening of the Lone Hill Bridge in Glendora. The Feasibility Study was required in order to address the deficiency report issued by Caltrans Structures Department, stating it was Functionally Obsolete and too narrow to be in accordance with AASHTO standards.

HKA prepared two design alternatives for the widening and modification of the bridge. The bridge spans the San Dimas Channel just south of the Lone Hill Avenue / I-210 interchange. Specific project elements included field surveying and right of way analysis, traffic planning and coordination with Caltrans, Foothill Transit, and a Park and Ride facility, environmental studies, bridge analysis of alternatives, coordination with the US Army Corps of Engineers, and preparation of engineering costs estimates.

Specific project issues included an ADA path of travel from the Park and Ride lot to the bus transit stop. The Park and Ride lot is approximately 20 to 25 feet below street level.

The two design alternatives both widened the bridge. However, one alternative included a transit bus taper south of the bridge.

HKA researched and located existing utility lines and easements to map in topographic surveys.