Tualatin Basin Water Supply

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Design Concepts

Doing nothing is not an option.

As there will already be hundreds of millions of dollars invested in the security of Scoggins Dam, it makes sense to simultaneously address the threat of water shortages.  Doing nothing is not an option.  Tualatin Basin Water Supply Project Partners are working with the Bureau of Reclamation to leverage their shared investments to protect the dam and the long-term needs of the community.  Congress passed legislation to increase the cost ceiling for the Safety of Dams program to provide more flexibility in planning.

Preliminary evaluations of the design concept are scheduled to be completed by the end of 2016.  The goal is to be assured that all environmental, social and economic impacts have been considered before modifications are begun.  There will be many ongoing opportunities for the public to provide input towards any possible assessments before any decisions are reached.  Information will be provided through meeting notices and newsletters and the Bureau of Reclamation and Clean Water Services will be available to answer questions by phone, email or in person.

The design options under consideration fall into two broad categories: 1) modification of the existing dam, and 2) construction of a downstream dam.  Each option has a choice of heights which will determine the water storage capacity.  The illustrations below depict the most likely options with various water levels.

Design concept 1: Existing Dam

Design concept 2: Downstream Dam