Project:        Panther Drive over Thatcher Brook Bridge Replacement

                Bridge Option Comparison

Option

Title

Description

Estimated Cost

Pros

Cons

1

Timber Superstructure on Conventional Abutments

Replaces the existing timber superstructure with a new 48-foot timber superstructure on concrete abutments. All existing superstructure and substructures will be removed to the streambed. Heavy Stone Filling will be placed along the streambank to resist scour. Approximately 150-ft of Total approach roadway reconstruction.

$740,000

  • Timber is a low-maintenance/maintenance free material
  • Lightweight Superstructure may reduce substructure size compared to traditional superstructure types
  • Aesthetically pleasing to School Property and surrounding environment
  • Prefabricated components allow for easy construction
  • Deck Joints between the superstructure and substructure will require periodic maintenance
  • Increased Span length will require a deeper superstructure which will result in a raised roadway profile
  • Timber Stringers may have tendency to snag debris carried by Thatcher Brook

2

Reinforced Concrete Three-sided Frame

Replaces the existing timber superstructure with a new 35-foot span precast concrete 3-sided frame on a pile/reinforced concrete footing. All existing superstructure and substructures will be removed to the streambed. Heavy Stone Filling will be placed along the streambank to resist scour. Approximately 150-ft of Total approach roadway reconstruction.

$740,000

  • Concrete is a durable, low-maintenance material
  • Smooth Interior is hydraulically favorable
  • Concrete can be stamped or dyed to improve aesthetics
  • Prefabricated components allow for easy construction
  • No Deck Joints with a tendency to leak
  • Concrete repairs over water can be difficult and costly.

3

Adjacent Prestressed Concrete Slab Bridge on Integral Abutments

Replaces the existing timber superstructure with a new 45-foot precast, prestressed hollow slab superstructure on reinforced concrete integral abutments. All existing superstructure and substructures will be removed to the streambed. Heavy Stone Filling will be placed along the streambank to resist scour. Approximately 150-ft of Total approach roadway reconstruction.

$750,000

  • Concrete is a durable, low-maintenance material
  • Smooth Interior is hydraulically favorable
  • Integral Construction eliminates leaking deck joints
  • Repairs to Adjacent Prestressed Beams can be difficult

Right-Of-Way Acquisition

$5,000

Notes: