ASDSO Dam Safety Toolbox

Underwater Construction

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Message: Divers may be required to complete construction.

At times, rehabilitating existing structures can present very difficult access and construction environments. Performing construction on underwater structures within a reservoir or outlet may be required.

The Willow Creek dam is an earthen dam constructed in 1966 that impounds a tributary of the Colorado River. A project was completed to rehabilitate the existing outlet works that included the following tasks:

  • Install 20' pipe segment with blind flange.
  • Reline existing outlet works with steel pipe and replace 2 existing valves in the dry.
  • Add new hydraulically operated gate valve.
  • Install trash rack and run hydraulic lines.
  • Project Site

    Project Site

  • Dive platform

    Dive platform

  • Pipe segment with flange

    Pipe segment with flange

  • Lower pipe into place

    Lower pipe into place

  • First rigging move

    First rigging move

  • Pipe moved to opening

    Pipe moved to opening

  • Pipe inserted into opening

    Pipe inserted into opening

  • Pipe rigged to pull into the existing outlet works

    Pipe rigged to pull into the existing outlet works

  • Pipe pulled into place

    Pipe pulled into place

  • Pipe in final position

    Pipe in final position


Note: The content on this page was originally created as part of DamOutletWorks.org (DOWL, 2018). It has subsequently been updated and reformatted as part of the Dam Safety Toolbox.
Revision ID: 4770
Revision Date: 12/02/2022

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