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Phase 2 Project Details
US17 Septima Clark Project Details for Phase 2


Updated 29 January 2018 - Construction commenced on 1 June 2015 and was completed on 20 December 2017.  The total cost of the construction work for this phase is approximately $25.5M.


Phase 2 of the US17 Septima Clark Transportation Infrastructure Reinvestment Project is very similar to the first phase of the project.  The work was split fairly evenly between additional improvements to the stormwater surface collection and conveyance system and additional transportation improvements.  The work will take place on the following streets:

  • Cannon St. between the western extremity of the previous phase and the Ashley River
  • Spring St. between the western extremity of the previous phase and the Ashley River
  • President St. from Cannon St. to Fishburne St.
  • Fishburne St. from Cannon St. to Ashley Ave.
  • Ashley Ave. from Fishburne St. to Sumter St. 

This phase of the project also includes landscaping and lighting improvements on the Crosstown (Cannon and Spring Streets).  Decorative street lights were installed along Cannon and Spring Streets similar to the ones installed along the first phase in addition to palm trees and other plants.  The grassed median between Cannon St, Spring St, Lockwood Blvd, and the former Wendy's received extensive landscaping.  Pedestrian improvements were also constructed along the Crosstown to make the corridor safer for both pedestrians and vehicles. 

Also as part of this phase, eight 140-ft deep drop shafts with corresponding vortex boxes were constructed.  The finished diameter of the drop shafts are 48-inches and 54-inches, depending on the amount of stormwater each of the systems is designed to accommodate.  The surface collection and conveyance systems are tied to these drop shafts which allow the water to flow into a system of deep tunnels that are being constructed as part of Phase 3. 

The funding was from a 50/50 grant from the the Federal Match Program administered by the SCDOT.  The City of Charleston paid for half the project and the SCDOT paid for the other half through money from the Federal Highway Administration.