Narrabeen Lagoon Aquatic Boardwalk

Thank you for your interest in this project.  Community engagement has now concluded.

Council has developed plans for an aquatic boardwalk for the northern side of the Narrabeen Lagoon trail to improve safety whilst protecting the environment.

Council has developed plans for an aquatic boardwalk for the northern side of the Narrabeen Lagoon trail to improve safety whilst protecting the environment.

Thank you for your interest in this project.  Community engagement has now concluded.
  • Project update - December 2018

    5 months ago

    In response to community engagement on the boardwalk project, Council revisited two options for terrestrial location of the walkway parallel to the Wakehurst Parkway and compared them to the proposed aquatic boardwalk.

    The aquatic boardwalk alignment as exhibited has been accepted as the final design for the following reasons:

    • best practice safety for pedestrians and cyclists
    • minimal environmental impact
    • diversity of recreation experience on the trail
    • aesthetically pleasing outcome from the waterway
    • ability for Council to undertake riparian and foreshore revegetation and restoration of the degraded lagoon edge along the Parkway
    The table below presents a summary of the main community concerns from the engagement process and an analysis of the options:

    Community concern

    Terrestrial Option

    Aquatic Boardwalk

    Tree removal required

    25

    3

    Vegetation lost

    Minimum 296 m2

    192 m2

    Revegetation opportunity

    none

    250 m2

    Educational opportunities

    Yes – Endangered Ecological Community (EEC) signage

    Yes interpretative aquatic flora and fauna signage & EEC signage

    Impact on daily usage

    Loop closed during construction 3 – 6 months

    Minor scheduled closures during on/off ramp construction only – timed

    Construction impact

    Potential dewatering and piling/filling into bank and riparian zone

    Over water – no barge required – piling into seagrass wrack not into riparian area


    Council has signed a contract with a service provider and works are to commence in May 2019. Completion of the walkway is scheduled for October 2019 (weather permitted).

    In response to community engagement on the boardwalk project, Council revisited two options for terrestrial location of the walkway parallel to the Wakehurst Parkway and compared them to the proposed aquatic boardwalk.

    The aquatic boardwalk alignment as exhibited has been accepted as the final design for the following reasons:

    • best practice safety for pedestrians and cyclists
    • minimal environmental impact
    • diversity of recreation experience on the trail
    • aesthetically pleasing outcome from the waterway
    • ability for Council to undertake riparian and foreshore revegetation and restoration of the degraded lagoon edge along the Parkway
    The table below presents a summary of the main community concerns from the engagement process and an analysis of the options:

    Community concern

    Terrestrial Option

    Aquatic Boardwalk

    Tree removal required

    25

    3

    Vegetation lost

    Minimum 296 m2

    192 m2

    Revegetation opportunity

    none

    250 m2

    Educational opportunities

    Yes – Endangered Ecological Community (EEC) signage

    Yes interpretative aquatic flora and fauna signage & EEC signage

    Impact on daily usage

    Loop closed during construction 3 – 6 months

    Minor scheduled closures during on/off ramp construction only – timed

    Construction impact

    Potential dewatering and piling/filling into bank and riparian zone

    Over water – no barge required – piling into seagrass wrack not into riparian area


    Council has signed a contract with a service provider and works are to commence in May 2019. Completion of the walkway is scheduled for October 2019 (weather permitted).

  • How to get involved

    about 1 year ago
    This project has been subject to feasibility reports and substantial planning. We invite you to review the associated documents:
    Have your say
    • Make an online submission (closed)

    • Attend our drop in session at Bilarong Reserve - Saturday 7 April 2018 – 1-3pm

    • Make a written submission: To the CEO, Northern Beaches Council, 725 Pittwater Road, Dee Why NSW 2099, marked “Narrabeen Lagoon Aquatic Boardwalk”

    If you have any questions, please call the Parks and Recreation team on 1300 434 434.

    Comments closed Sunday 6 May 2018
    This project has been subject to feasibility reports and substantial planning. We invite you to review the associated documents:
    Have your say
    • Make an online submission (closed)

    • Attend our drop in session at Bilarong Reserve - Saturday 7 April 2018 – 1-3pm

    • Make a written submission: To the CEO, Northern Beaches Council, 725 Pittwater Road, Dee Why NSW 2099, marked “Narrabeen Lagoon Aquatic Boardwalk”

    If you have any questions, please call the Parks and Recreation team on 1300 434 434.

    Comments closed Sunday 6 May 2018
  • Background

    about 1 year ago

    Since completion of stage 2b of the Narrabeen Lagoon Trail (NLT) in 2015 the recreational trail has enjoyed high popularity with the community and the Trail is considered a success in promoting a healthy lifestyle while also providing sustainable access to the natural environment.

    Council has developed a safe solution for the northern side of the lagoon where the trail is adjacent to the Wakehurst Parkway. This narrow section of trail is a potential hazard for bike riders and pedestrians.

    This existing path is in an environmentally sensitive area. The embankment is too unstable to construct a cantilevered structure and would require removal of all vegetation along this part of the riparian zone.

    The proposal:

    To address the constraints and risks noted above Council has developed a boardwalk that crosses the bay.

    View the documents in the document library and referenced in the above news article.

    The boardwalk has been design to follow an alignment that has minimal environmental disturbance and the methodology for construction has been specified to ensure there is no impact on surrounding sea grass beds.

    The benefits of this aquatic boardwalk are that it eliminates the risks involved with a land based solution and:

    • Preserves the Aboriginal heritage items on the shore

    • Provides a consistent level of service with rest of the NLT

    • Resolves safety hazards

    • Enables the remediation of the riparian zone (included in the scope of the project)

    • Provides a much better experience being well removed from major arterial road.

    The key features of the design include:

    • Turpentine piles to ensure there is no leaching of harmful chemicals from concrete or treated pine piles into the waterway

    • 2.5m width of boardwalk to comply with shared path requirements

    • Inbuilt pockets in the boardwalk abutments to provide habitat opportunity

    • The alignment and construction methodology has been determined by the current bed of dead seagrass to ensure that living beds of seagrass are protected.


    Since completion of stage 2b of the Narrabeen Lagoon Trail (NLT) in 2015 the recreational trail has enjoyed high popularity with the community and the Trail is considered a success in promoting a healthy lifestyle while also providing sustainable access to the natural environment.

    Council has developed a safe solution for the northern side of the lagoon where the trail is adjacent to the Wakehurst Parkway. This narrow section of trail is a potential hazard for bike riders and pedestrians.

    This existing path is in an environmentally sensitive area. The embankment is too unstable to construct a cantilevered structure and would require removal of all vegetation along this part of the riparian zone.

    The proposal:

    To address the constraints and risks noted above Council has developed a boardwalk that crosses the bay.

    View the documents in the document library and referenced in the above news article.

    The boardwalk has been design to follow an alignment that has minimal environmental disturbance and the methodology for construction has been specified to ensure there is no impact on surrounding sea grass beds.

    The benefits of this aquatic boardwalk are that it eliminates the risks involved with a land based solution and:

    • Preserves the Aboriginal heritage items on the shore

    • Provides a consistent level of service with rest of the NLT

    • Resolves safety hazards

    • Enables the remediation of the riparian zone (included in the scope of the project)

    • Provides a much better experience being well removed from major arterial road.

    The key features of the design include:

    • Turpentine piles to ensure there is no leaching of harmful chemicals from concrete or treated pine piles into the waterway

    • 2.5m width of boardwalk to comply with shared path requirements

    • Inbuilt pockets in the boardwalk abutments to provide habitat opportunity

    • The alignment and construction methodology has been determined by the current bed of dead seagrass to ensure that living beds of seagrass are protected.