Bonneville Gantry Crane

The Bonneville Lock and Dam is located 40 miles east of Portland, Oregon, on the Columbia River, and generates electric power distributed by the Bonneville Power Administration. The dam was originally built in the 1930s, and in 1981, the owner, U.S. Army Corps of Engineers opened a second powerhouse complete with a 73 foot tall, 85 ton, intake gantry crane. Coffman recently provided structural, mechanical, and electrical engineering design and commissioning services for the rehabilitation of the aging crane that places bulkheads/stoplogs for the intakes to the turbines. The work included a site survey for identifying engineering aspects, producing manufacturing drawings, engineering during construction, and developing operating and maintenance data. Upgrades included a completely new main trolley and main hoist, auxiliary trolley drive system, two auxiliary hoists, four gantry drives, new operator cab, new electrical room, load indication system, crane electrification system, safety upgrades, and all new motors, brakes, and variable frequency drive controls.


  • Civic & Local Government


  • Crane Design
  • Electrical Engineering
  • Structural Engineering
  • Industrial Design
  • Electrical Instrumentation & Controls