Snoqualmie Falls Redevelopment

Snoqualmie Falls, Snoqualmie, WA, United States

Puget Sound Energy (PSE) owns and operates the Snoqualmie Falls Hydroelectric Facility located near the tourist area of Snoqualmie Falls. The existing facilities consist of a diversion dam and two powerhouses (Plants 1 and 2) with a total installed capacity of 44.4 MW. Plant 1 is a five-unit powerhouse originally constructed in 1898 and was the first underground powerhouse in North America. Plant 2 is a two-unit surface powerhouse originally constructed in 1910 and redeveloped in 1956.

The Snoqualmie Falls Redevelopment Project involves a combination of upgrading and/or replacing existing generating equipment and structures, in accordance with PSE’s new FERC license. The aesthetic aspects of the 110-year-old generating site will be preserved.

As part of the large-scale upgrade and redevelopment of the historic 47 MW Snoqualmie Falls Hydroelectric plants, switchyard design was completed to connect the generator step-up transformers to the 115 kV transmission line.

Following a competitive process, Klohn Crippen Berger was retained by PSE to carry out the condition assessment, preliminary and detailed design, preparation of tender documents, and construction services and commissioning.


  • Preliminary design
  • Site investigations
  • Physical model test supervision
  • Condition assessment
  • Detailed multidiscipline design
  • Cost estimating
  • Tender document and construction services
  • Commissioning


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