Millers Church Bridge
This project is the replacement of the single span bridge carrying S.R. 1004, Millers Church Road over Armstrong Creek in Jackson Township, Dauphin County. The existing curb-to-curb width of the structure was a mere 17 feet and each roadway approach was signed to yield to oncoming traffic. The geometry of the roadway was adjusted slightly to provide for two lanes of traffic with minimal shoulders in accordance with the minimum structure design criteria without major impacts to environmental features or right-of-way. Gibson-Thomas Engineering provided a careful analysis of structure type, roadway profile and stream hydraulics to minimize construction cost and maximize benefit to PennDOT customers. The structure was also designed with the Department’s BRADD 2 software for additional cost savings.
The project included environmental analysis, 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 P.S.&E. preparation through ECMS utilizing AutoTAB. Gibson-Thomas Engineering earned performance ratings of 92% and 95% for preliminary engineering and final design respectively for this project while expending less than 51% of the Final Design Direct/Indirect Labor budget.
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