William Hilton Parkway Gateway Corridor Improvements Reasonable Alternatives

The Preliminary Range of Alternatives and the Proposed Reasonable Alternatives were presented to the public at a Public Information Meeting on September 19, 2019.

Based on input received from the public and agencies, SCDOT revised the Proposed Reasonable Alternatives to include the following:

  • Coordination with US Fish and Wildlife Service regarding the six Proposed Reasonable Alternatives (RA1-RA6) resulted in a revision to Alternative 4 that moved the proposed interchange on Pinckney Island closer to the existing US 278 Corridor. This revision resulted in a new alternative, Alternative 4A.

  • Alternative 5 and Alternative 6 utilize the existing Power Line Easement to relocate US 278 to a new 6-through-lane (travel lane) section from the end of the new SkullCreek Bridges through Jenkins Island. Based on input from the utility companies, these two alternatives were revised to run south of the existing power line easement across Jenkins Island. These revisions resulted in two new alternatives, Alternative 5A and Alternative 6A.

  • All of the Proposed Reasonable Alternatives, except for Alternative 5, were revised o provide more efficient ingress/egress to properties on Hog Island. In addition, the revised Hog Island access allows for an improved maintenance of traffic during construction. Figure 5-2 illustrates the ingress/egress developed for Alternative 2 which is representative of all the Proposed Reasonable Alternatives, except for Alternative 5.

Based on the public input and the revisions explained above, the six (6) reasonable alternatives were revised to nine (9) Proposed Reasonable Alternatives shown below, with the new alternatives denoted with "A" in the name following the number.

View All Reasonable Alternatives Combined
(you may toggle on and off layers to view each alternative)


RA1. Reasonable Alternative 1 (RA1)

  • Build new eastbound Mackay Creek bridge south of the existing bridge
  • Recondition and widen existing westbound Mackay Creek bridge
  • Recondition and possibly widen Skull Creek bridges
  • Use existing alignment as much as possible

View Reasonable Alternative 1

RA2. Reasonable Alternative 2 (RA2)

  • Build a new bridge to the north of existing westbound Mackay Creek bridge
  • Recondition existing westbound Mackay Creek bridge and convert to eastbound traffic
  • Use newly constructed bridge for westbound traffic over Mackay Creek
  • Recondition and possibly widen Skull Creek bridges

View Reasonable Alternative 2

RA3. Reasonable Alternative 3 (RA3)

  • Build 2 new eastbound bridges south of the existing alignments, one over Mackay Creek and one over Skull Creek
  • Recondition and widen westbound Mackay Creek Bridge
  • Recondition existing Skull Creek Bridges and convert to westbound traffic only

View Reasonable Alternative 3

RA4. Reasonable Alternative 4 (RA4)

  • Replace all 4 existing bridges with one new bridge immediately south of the existing alignment
  • Build a new access to the Pinckney Island National Wildlife Refuge and CC Haigh Jr. Boat Ramp
  • Use existing alignment east of the new bridges
  • Remove existing bridges

View Reasonable Alternative 4A

RA4A. Reasonable Alternative 4A (RA4A)

  • Same as RA4, but revised based on Public Agency Feedback. See above
  • Replace all 4 existing bridges with one new bridge immediately south of the existing alignment
  • Build a new access to the Pinckney Island National Wildlife Refuge and CC Haigh Jr. Boat Ramp
  • Use existing alignment east of the new bridges
  • Remove existing Bridges

View Reasonable Alternative 4A

RA5. Reasonable Alternative 5 (RA5)

  • Build 2 new eastbound bridges just south of the existing
  • Recondition westbound bridges and widen in place
  • Improve access to the Pinckney Island National Wildlife Refuge and CC Haigh Jr. Boat Ramp
  • Utilize the existing transmission line easement for US 278 running from Jenkins Island through Spanish Wells Road

View Reasonable Alternative 5

RA5A. Reasonable Alternative 5 (RA5A)

  • Same as RA5, but revised based on Public and Agency Feedback. See above
  • Build 2 new eastbound bridges just south of the existing
  • Recondition westbound bridges and widen in place
  • Improve access to the Pinckney Island National Wildlife Refuge and CC Haigh Jr. Boat Ramp
  • Utilizing property adjacent to, but just south of, the existing transmission line easement for US 278 running from Jenkins Island through Spanish Wells Road
  • Remove existing bridges

View Reasonable Alternative 5A

RA6. Reasonable Alternative 6 (RA6)

  • Replace all 4 existing bridges with one new bridge just south of the existing US 278 alignment
  • Build a new access to the Pinckney Island National Wildlife Refuge and CC Haigh Jr. Boat Ramp
  • Utilize the existing transmission line easement running from Jenkins Island through Spanish Wells Road
  • Remove existing bridges

View Reasonable Alternative 6

RA6A. Reasonable Alternative 6 (RA6A)

  • Same as RA6, but revised based on Public and Agency Feedback, See above
  • Replace all 4 existing bridges with one new bridge just south of the existing US 278 alignment
  • Build a new access to the Pinckney Island National Wildlife Refuge and CC Haigh Jr. Boat Ramp
  • Utilizing property adjacent to, but just south of, the existing transmission line easement for US 278 running from Jenkins Island through Spanish Wells Road
  • Remove existing bridges

View Reasonable Alternative 6A