Copper River Delta Bridge #339 pp g Russell Johnson, P.E. El Elmer - - PowerPoint PPT Presentation

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Copper River Delta Bridge #339 pp g Russell Johnson, P.E. El Elmer - - PowerPoint PPT Presentation

Feb 24, 2023 282 likes •454 views

Copper River Delta Bridge #339 pp g Russell Johnson, P.E. El Elmer E. Marx, P.E. E M PE State of Alaska DOT&PF Bridge Section Bridge Background Originally built around 1977 Originally built around 1977 Five spans of 80 ft each ~

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Copper River Delta Bridge #339 pp g

Russell Johnson, P.E. El E M PE Elmer E. Marx, P.E. State of Alaska DOT&PF Bridge Section

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Bridge Background

  • Originally built around 1977

Originally built around 1977

  • Five spans of 80‐ft each ~ 401‐ft total length
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Bridge Background

  • Two piles per pier = “non‐redundant”

Two piles per pier = non redundant

  • Precast concrete girders spans
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Recent Hydraulic Events

  • Natural realignment of the Copper River

Natural realignment of the Copper River

  • Water flow considerations:

Design value = 21,300 cfs 2011 measured = 89 000 cfs 2011 measured = 89,000 cfs Predicted future = 119,000 to 235,000 cfs

  • Flow under the Million Dollar Bridge is about

205 600 f 205,600 cfs

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Recent Hydraulic Events #339

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Recent Hydraulic Events #339

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Recent Hydraulic Events #339

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Recent Hydraulic Events #339

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Recent Hydraulic Events #342

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Recent Hydraulic Events

  • Channel soundings 1998 to 2006

Channel soundings 1998 to 2006

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Recent Hydraulic Events

  • Channel soundings summer 2011

Channel soundings summer 2011

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Ice Concerns

  • Bridge failure due to ice loads is not unexpected

Bridge failure due to ice loads is not unexpected

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Proposed Bridge

  • Increase spans to 140‐ft each
  • Approximately 840‐ft long or more
  • Deep single drilled shaft foundations ($)
  • Deep, single drilled shaft foundations ($) …
  • … Or multiple 4‐ft diameter pipe piles at piers

75 ft

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Proposed Bridge

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Other hurdles

  • Access to proposed piers

Access to proposed piers

  • Channel migration (see bridge #342)
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Anticipated Schedule

  • Spring / Summer 2012 – gather engineering field data

Spring / Summer 2012 gather engineering field data

  • Summer / Fall 2012 – develop hydraulic river model
  • Fall / Winter 2012 – Develop preliminary bridge design

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  • Winter / Spring 2013 – Final environmental document
  • Summer 2013 – Final design

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  • Fall 2013 to Winter 2014 – Permitting & possible ROW
  • Spring 2015 ‐ Construction