Dauphin County Wetland Creation

 

JMT utilized a variety of techniques in the strategy and design of a wetland creation project for PENNDOT District 8-0.  The wetland creation project was initiated to mitigate for unavoidable impacts to 3.5 acres of freshwater wetlands in the Susquehanna River watershed.  The impacts were the result of the relocation and widening of a five-mile section of the U.S. 22/322 Dauphin Bypass and a one-mile section of PA 225 located in Dauphin County, PA. Project specifics included:

  • The wetland impacts were permitted in accordance with the Federal Clean Water Act, the Pennsylvania Dam Safety and Encroachments Act, the Flood Plain Management Act, and the Pennsylvania Clean Streams Law.
  • PENNDOT’s newly created Wetland Restoration/Creation Registry was used due to insufficient acreage in the project area.
  • York County site was found that had sufficient acreage, met the project goals, and could be obtained cost effectively.
  • Three differend designs prepared to complement the existing landscape, thereby minimizing earthwork and costs.  
  • JMT’s wetland creation exceeded project goals, establishing 4.5 acres of emergent, scrub/shrub and forested wetlands.
  • Site presented U.S. Army Corps of Engineers and the PA Department of Environmental Protection.  
  • The wetlands are successfully performing the intended functions of floodflow alteration, sediment/toxicant retention and nutrient removal/transformation.
  • Diversity of wildlife habitat was encouraged through the use of a mixture of woody and herbaceous vegetation
  • Movement of wildlife has been enhanced through the provision of a green corridor
  • JMT obtained approval of the wetland creation plans, the terrestrial habitat plans, and a Joint Federal/State Permit for wetland impacts within five months of submission. 
  • JMT was awarded the ACEC of Pennsylvania’s Diamond Award for Engineering Excellence Honor Award