Macpherson Street & Warriewood Road upgrades

Project name: Macpherson Street & Warriewood Road Upgrades

Client: Northern Beaches Council

Value: $7 million

Location: Corner Macpherson Street and Warriewood Road, Warriewood

Duration: 52 weeks

Commencement: October 2016

Overview: This contract involves upgrading the existing Macpherson Street from Boondah Road to Warriewood Road and the Warriewood Road and Macpherson Street intersection. Once completed, this project will provide an improvement in flood alleviation on Macpherson Street, increased capacity of the existing road and stormwater drainage, an improved experience to the public for both road users and pedestrians and improvement to the utilities infrastructure for future development in the adjacent private lots.

Scope of works:  The project includes the widening of Macpherson Street from Boondah Road to Warriewood Road, the installation of a bridge crossing of Narrabeen Creek between Boondah Road and Warriewood Road, and the construction of a roundabout at the intersection of Macpherson Street and Warriewood Road.

The Project comprises the following components:

  • Upgrade and raise the level of Macpherson Street to a nominal finished centreline surface road level of 4.2 mAHD (up to 2.2 metres above existing ground level)
  • Replace the existing culvert on Macpherson Street at Narrabeen Creek with a pre-cast concrete bridge (including reinforced concrete abutments founded on piles) to cater for a 100 year average recurrence interval (ARI) flood event
  • Install a new pre-cast concrete culvert crossing consisting of five (5) crown units, each 3.6 metres wide and 1.2 metres high, and four (4) link slabs, each creating an effective cell size of 3.6 metres wide and 1.46 metres high, on Macpherson Street at the western flowpath to cater for a 100 year ARI
  • Construct a roundabout at the intersection of Macpherson Street and Warriewood Road
  • Upgrade Warriewood Road between Vuko Place and Macedon Place
  • Reconstruct two domestic (No. 2 and No. 40 Warriewood Road), one commercial (No. 2 Macpherson Street) and two Sydney Water (Macpherson Street and Warriewood Road) access driveways, with associated retaining structures
  • Underground overhead electricity supply and telecommunication lines on Macpherson Street from Warriewood Road to Boondah Road
  • Relocate underground services, comprising gas, potable water and stormwater drainage on Macpherson Street from Warriewood Road to Boondah Road
  • Stabilise, rehabilitate and revegetate upstream and downstream of the proposed new bridge crossing of Narrabeen Creek and in areas disturbed by Project related construction works
  • Construct the creek line transition from the undisturbed creek on upstream and downstream boundaries of creek stabilisation works