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Worumbo Spillway Rehabilitation

Location:
Lisbon Falls & Durham, ME
Completed:
2011

Scope of Work

Cianbro removed the existing 600 foot long timber crib spillway and constructed a new reinforced concrete spillway, on the Androscoggin River.

Project Details

  • Installed a 20,000 CY earthen cofferdam
  • Dewatered the up stream cofferdam
  • Installed 25 ft diameter cofferdam cells
  • Removed the existing Obermeyer flashboard system and timber crib dam
  • Cleaned 8,000 SF of ledge
  • Performed overburden and ledge excavation
  • Installed 95 rock dowels
  • Installed a new 3,100 CY reinforced concrete spillway with mass concrete specifications
  • Installed 520 LF of Obermeyer panels with new air bags
  • Installed sedimentation controls and removed cofferdam cells
  • Removed upstream and downstream sedimentation basins

Lean, Innovative, and Unique Project Solutions

This project had a condensed construction schedule, a challenging concrete pour sequence, and a tremendous amount of attention was paid to environmental requirements.