Dam Safety

The navigation lock at Bonneville Dam was closed on Thursday, Sept. 5, after lock operators detected problems with the lock during operation. Engineers dewatered the lock Sept. 6, performed an inspection and discovered that the downstream concrete sill, against which lock gates create a water-tight seal, had cracks. The U.S. Army Corps of Engineers —...
Rehabilitation and Repair

NorthWestern Energy has announced plans to upgrade its 8-MW Madison Powerhouse with the installation of four new turbine-generator units. The turbines and generators in the Madison Powerhouse, on the Madison River about 10 miles north of Ennis, Mt., are 109 years old. The original powerhouse building will remain in place, largely unaltered, while four new...