OTIRA VIADUCT

Officially Opened

The Otira Viaduct had it's official opening on Saturday 6th November, 1999. The Official Opening was carried out by The Rt. Honourable Jenny Shipley Prime Minister, and Ed Evans Snr.

Jenny Shipley being welcomed to the site
The Prime Minister being welcomed to the Viaduct site.

Cutting the ribbon...
Jenny Shipley (yellow coat), & Ed Evans Snr. cutting the ribbon.

Otira Viaduct
The completed Otira Viaduct.

WHY THE VIADUCT HAS BEEN BUILT...

Major Rockfall hazard above and below the existing road (the zig zag) threatens to destroy it, or at least undermine it to a point where it is not repairable.

FACTORS THAT AFFECTED CONSTRUCTION...

HAZARDS

  • Major rockfalls from above
  • Located in an active seismic region (small earthquakes from time to time)
  • Riverbed scour from the Otira River
  • Otira River flooding (max. 5cu.m/second)

ENVIRONMENT

  • In Arthur's Pass National Park
  • Minimise disturbance to vegetation
  • Blend structure with natural contours
  • Protection of cultural features

CONSTRUCTION STATISTICS...

VIADUCT
  • Total Length 440 metres
  • Maximum Span134 metres
  • No. of Spans 4
  • Road Width 8 metres
  • Gradient 11.7%
  • Pier Height 35 metres
  • Pier Foundations 25 metres deep
  • Pier Dimension 4m x 3.5m
  • Stressing Strands 3150 metres
  • Concrete Volume 5,000 cu.metres
  • Construction Method-Balanced Cantilever
  • Superstructure Form - Post Tensioned Concrete Box Girder
NORTH GULLY BRIDGE
  • Total Length 30 metres
  • No. of Spans 2
  • Gradient 12%
  • Construction Method - Precast prestressed concrete
EARTHWORKS Total Volume 80,000 cu. metres

PROJECT DETAILS

CONTRACTOR McConnell Smith Ltd
TOTAL COST $25,000,000 (on budget)
WORK BEGAN February 1997
COMPLETION November 1999
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