Centre Island Ferry Terminal Existing Conditions

The Ferry Terminal is located on the northern shore of Centre Island. The Ferry Terminal shoreline is currently surrounded by an existing steel sheet pile wall; however, the wall is too low to prevent flooding during high-lake levels.

Existing shoreline conditions at Centre Island Ferry Terminal. Source: Baird, 2022.

Centre Island Ferry Terminal Concept Designs

The following concept designs are being presented:

Concept 1
Steel Sheet Pile Wall

Concept 1 involves installing a new steel sheet pile wall with a higher elevation in front of the existing seawall. The land behind the seawall would be raised to blend the height difference.

Ferry Terminal - Concept 1: Steel Sheet Pile Wall. Source: Baird, 2022.
Ferry Terminal - Concept 1, Cross-section A. Source: Baird, 2022.
Advantages
  • Minimal maintenance requirements
  • Smallest land and lakebed footprint
Disadvantages
  • No added ecological or recreational benefits
  • Slightly less effective erosion control compared to other concepts

OVERALL EVALUATION RANKING: LOW

Concept 2A
Stacked Armourstone Wall

Concept 2 involves installing a stepped wall in front of the existing seawall. This concept is split into two options depending on the type of material that is used. In Concept 2A, a stacked armourstone wall would be built and a berm would be placed behind it for flood protection.

Ferry Terminal - Concept 2A: Stepped Wall. Source: Baird, 2022.
Ferry Terminal - Concept 2A, Cross-section A. Source: Baird, 2022.
Advantages
  • Provides some ecological benefit to aquatic and terrestrial communities
  • More aesthetically pleasing compared to other alternatives
  • Added recreational value as stacked wall could be used for seating
  • Lower cost solution compared to other alternatives
Disadvantages
  • Despite some ecological benefit, vertical wall is not ideal for aquatic habitat

OVERALL EVALUATION RANKING: HIGH

Concept 2B
Stepped Concrete Wall

In Concept 2B, the wall would be built by installing a new steel sheet pile wall in front of the existing seawall. Concrete steps would be installed over top of the wall to create a seating area and the land behind it would be raised.

Ferry Terminal - Concept 2B: Stepped Concrete Wall. Source: Baird, 2022
Ferry Terminal - Concept 2B, Cross-section B. Source: Baird, 2022.
Advantages
  • Added recreational value as stepped wall could be used for seating
Disadvantages
  • No added ecological benefit

OVERALL EVALUATION RATING: MEDIUM

Concept 3
Flood Berm and Revetment

Concept 3 involves installing a berm around the shoreline. A rip rap revetment would be placed in front of the berm and existing seawall to provide structural support. The berm would include vegetation and could be designed with a walking or biking path on top if desired.

Ferry Terminal - Concept 3: Flood Berm and Revetment. Source: Baird, 2022.
Ferry Terminal - Concept 3, Cross-section A with Vegetated Concrete Block Mattress on Lake Facing Side. Source: Baird, 2022.
Ferry Terminal - Concept 3, Cross-section A with Cobble on Lake Facing Side. Source: Baird, 2022.
Advantages
  • Provides greatest ecological benefit to aquatic and terrestrial communities
Disadvantages
  • Largest impact to lakebed

OVERALL EVALUATION RATING: MEDIUM

Centre Island Focus Areas
Select a focus area to learn more about existing conditions and concept designs

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