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Project Phasing
Project Phasing

UPDATED 23 MAY 2017

Phase 1 (Completed):
  With the completion of the first phase of the project (TIGER 1), significant improvements have been made to pedestrian safety, vehicular safety, and traffic efficiency along and directly adjacent to the Septima Clark Parkway from Spring St to Coming St.  While more than 175 stormwater structures and 5,500 linear feet of pipe ranging from 18-in diameter to 48-in diameter have been installed in this same stretch of roadway, significant work still needs to be completed before the drainage problems can be more fully alleviated.  Additional phases are planned with project completion estimated for 2020. 

Phase 2 (underway):  Additional work on Spring and Cannon Streets from the western terminus of Phase 1 to Lockwood Blvd, President St south of the Crosstown to Cannon St, President St north of the Crosstown to Fishburne St, Fishburne St from Harmon Field to Ashley Ave, and Ashley Ave from Fishburne St to Sumter St.  Eight drop shafts will also be constructed during this phase that will eventually be connected to the deep tunnel system (Phase 3).  Crowder Construction Company (Charlotte, NC) began work on 1 June 2015 and is expected to be completed by September 2017. 

Phase 3 (underway):  8,232 linear feet of 8-ft and 12-ft diamter tunnel up to 150-ft below the ground surface (approximately 1 mile east-west under US17 and approximately 1/2 mile north-south, crossing the other tunnel, under President St), two 30-ft diameter working shafts, and two 20-ft diameter exit shafts.  Contractor will begin to mobilize in early July 2016 and complete this phase by July 2019.   
  
Phase 4:  Construction of the wet well for the large stormwater pumps and the triple box culvert outfall into the Ashley River.  With completion of Phase 4 of the project, some drainage improvements should be realized.  It is estimated that construction for Phase 4 may begin in early 2018 (depending on when the Crosstown tunnel is complete and the contactor has demobilized from the Ashley River Bridges site) and be completed in 2020.

Phase 5:  A new pump station between the Ashley River Bridges with three pumps each capable of pumping 120,000 gallons per minute, three 850 h.p. diesel engines to power the pumps (thereby eliminating the need for electricity to run the pumps in the event of a power failure), and one back-up diesel generator to run the electrical and control systems in the event of a power failure.  Once Phase 5 is complete and the pump station is on-line, the Crosstown and surrounding areas should remain passable in all but the very worst storm events.  (Due to the topography and layout of the City of Charleston, the pump station will not be able to accommodate tropical storm events with storm surge that inundates the City.)  It is estimated that construction for the pump station will begin at the completion of Phase 4 (2019) and be brought on-line sometime in late 2021. 


Steven A. Kirk, P.E.
Senior Engineering Project Manager
Email

2 George Street
Suite 2100
Charleston, SC 29401

Ph: 843-579-7682
Fx: 843-973-7261