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Yampi Sound Road Crossing


Project Type / Category
More Projects
End Client
JLL (on behalf of Department of Defence)
Project Value
Project Location
Kimbolton Road, KIMBOLTON WA 6728
Project Completion
December 2016
Site Area
Number of Stages
Value Engineering Solution
  • Horizontal alignments that reduced the overall length, imported fill and located adjacent to potential borrow pits
  • Pavement additives that provided an all-weather access, without sealing the carriageway
Unique Design Items
  • Alternative horizontal alignments
  • Alternative pavement compositions
  • Alternative water crossing structures – bridge/floodway/culverts
  • The current road alignment doesn’t remain within gazetted road reserve for the full 70km. The gazetted road reserve is narrow at approximately 20m, which will require widening in parts to accommodate building up of the roads and battering to cut of drains.

Pritchard Francis was engaged by JLL as Civil Lead Consultant to carry out a feasibility study of constructing 70km of sealed road along the Kimbolton Road track from Gibb River Road, approximately 40km from Derby, Western Australia, to the Department of Defence training grounds in West Kimberley. For approximately 60km, Kimbolton Road crosses black soils, claypan and alluvial material transversing floodplains and river crossings, which become impassable in the wet season.

Pritchard Francis, following our close relationship with JLL and the Department of Defence, undertook a feasibility study for the road construction, including the preliminary design of road pavement, river crossing options, possible track realignment, coordination of the geotechnical scope and for the road construction, borrow pit location investigations and fill material requirements. Pritchard Francis also investigated alternative road alignments to reduce construction costs and duration by way of more favourable topography and ground conditions with improved probability in encountering a suitable source of road construction material.