Church Street Bridge
This project is the replacement of the two span bridge carrying S.R. 1021, Church Street, over the Wiconisco Creek in Washington Township, Dauphin County. The 24-foot clear roadway width through the 106 foot, 2-span, steel I-beam structure; allowed for two lanes of traffic with no shoulder. Gibson-Thomas Engineering designed the new structure with minimal shoulders utilizing the minimum structure width criteria to coincide with the existing roadway width through the corridor. The structure was slightly perched and the profile was adjusted to minimize this condition with no effort on stream hydraulics or environmental features. This project required close coordination with PA DEP and the Dauphin Conservation District for the use of a causeway for the pier construction. The project included environmental analysis, field surveying, alternative analysis, line, grade and typical section, erosion and sediment control plans, hydraulic analysis and permitting, right-of-way plans, structure design, roadway design and PS&E preparation through ECMS utilizing AutoTAB.
Gibson-Thomas Engineering earned performance ratings of 94% and 95% for preliminary engineering and final design respectively for this project while expending less than 70% of the Final Design Direct/Indirect Labor budget.