Holtwood Hydro Electric Power Plant Expansion


The Holtwood Hydroelectric Power Plant expansion project includes the 125-megawatt addition to the existing 108 megawatt plant, the demolition of an on-site existing coal-fired power plant, the construction of a new hydroelectric powerhouse, improvements to the fish passage at the Holtwood dam, and extensive roadway and rail modifications. There are more than 67,000 cubic yards of concrete, an on-site batch plant, more than 3,700 tons of reinforcing steel and more than 1.5 million cubic yards of excavation.


Specialized Engineering is responsible for monitoring Construction Quality Assurance/Quality Control (QA/QC) during the phases of construction. Testing and Inspection Services provided by Specialized Engineering included the following:

  • Storm Water Management Construction
  • Utility Backfill
  • Deep and Shallow Foundation Construction
  • Reinforcing Steel
  • Structural Steel
  • Fireproofing
  • Formwork
  • Concrete Pre-placement
  • Cast-In-Place Concrete
  • Field Density Testing of Fill Materials
  • Masonry
  • Batch Plant
  • Precast Shop
  • Field Testing of Plastic Concrete

Specialized Engineering is conducting laboratory testing and analysis of proposed fill materials, testing of concrete cylinders, masonry grout testing, and soil sampling in our onsite laboratory. Wish to learn more about this project? Please contact us at 800-773-3808.