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US 278 Gateway Corridor Improvements
Reasonable Alternatives

Project Information

After evaluating the preliminary range of alternatives against the first set of criteria identified in the Alternatives Evaluation Criteria Matrix , 6 Reasonable Alternatives remain. View the PDFs for each of the alternatives individually below.

View All Reasonable Alternatives Combined pdf icon (14 MB)
(you may toggle on and off layers to view each alternative)

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 pdf icon (12 MB)

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 pdf icon (12 MB)

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 pdf icon (12 MB)

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 4 pdf icon (12 MB)

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 pdf icon (12 MB)

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 pdf icon (12 MB)


US 278 Gateway Corridor Improvments Project Update with Reasonable Alternatives Presentation
- September 26, 2019