Uniontown Road Bridge Over Lapatcong Creek
The project included the replacement of an existing 22-foot span bridge over Lopatcong Creek with a three (3) sided box culvert. The new culvert was widened by approximately 11 feet with an effective span of 24 feet. The upstream face of the culvert was located one (1) foot upstream of the existing bridge, and the downstream face of the culvert was located ten (10) feet further from the existing bridge along the flow direction.
The scope of services included: topographic survey, community involvement, bridge and roadway design, soil borings, right-of-way taking and construction easement maps, drainage design, utilities, soil erosion, environmental permitting, and MPT and detour plans. The project also included a geotechnical evaluation and report preparation, and general coordination with the County of Warren, the Contractor and utility companies during construction.
The project involved the use of a temporary bridge to maintain traffic so that the entire culvert could be constructed in one (1) stage. This recommendation was based on several factors; however, the three (3) most compelling factors included: 1) a significantly shorter construction duration (4 – 6 months vs. 12 months); 2) a lower construction cost; and, 3) a decreased impact to the motoring public.
Boswell estimated that the temporary bridge option would add approximately ten (10) additional feet of disturbance into the wetland area versus a two-stage construction of the culvert. The environmental permitting required an Individual Wetlands Permit, Individual Flood Hazard Permit and a Highlands Applicability Determination.