Structural Projects

	The St. Mary’s Bridge is located on US 1/SR 15 in Nassau County at the Florida-Georgia Border. The river crossing consists of two parallel bridges that are approximately 380 feet long and 34 feet wide in each direction. Both bridges were identified as scour susceptible high priority bridges. The estimated 100-year scour event appeared to undermine one of the bridge bents with the existing conditions being marginally stable. CSI performed the necessary geotechnical investigation to evaluate the soil conditions within the St. Mary’s River Canal and soil scour susceptibility. CSI then provided design parameters and construction recommendations for the foundation repair. This also included developing foundations alternatives for the proposed structure modifications that would prevent a bridge failure in the event that superstructure to substructure support was eliminated at one pier.		Play \| Stop \| Next \| Previous

	Project:
	St. Mary’s Bridge Foundation Design Improvements
	Location:
	Nassau County, Florida
	Client:
	Florida Department of Transportation - District 2
	Service:
	Structural Engineering
	Classification:
	Minor Bridges