PROJECT: Surveying

Avista Nine Mile Falls Dam

Nine Mile Falls, Washington


Avista Corporation

Construction Value:


This project was completed at Avista’s Nine Mile Falls hydroelectric dam site in Nine Mile Falls, Washington. T-O Engineers completed boundary surveying for property lines and right-of-ways, topographic surveys for civil and structural engineering design, construction staking and as-built surveying and mapping. This project was a reconstruction of the powerhouse and improvements to the existing dam site and included water and sewer line construction, building of a warehouse, establishing permanent site control and re-construction of the dam power house. 

Services Provided:

  • Horizontal and vertical control around the site
  • Boundary Surveying
  • Record of Survey
  • Topographic Surveying
  • Topographic Base Mapping
  • Construction Staking
  • As-Built Mapping
  • Horizontal and vertical control inside the power house
  • Quantity calculations