Regulatory tunnels holding up at Garrison DamRIVERDALE (AP) — Officials say an inspection of regulatory tunnels at Garrison Dam on the Missouri River in North Dakota found no problems.
RIVERDALE (AP) — Officials say an inspection of regulatory tunnels at Garrison Dam on the Missouri River in North Dakota found no problems.
The three tunnels are used for overflow. The Army Corps of Engineers has been releasing record amounts of water through the dam and others on the river because of excessive spring snowmelt and rain, and the regulatory tunnels were put into use about 2 ½ months ago.
Officials on Monday submerged a machine carrying an underwater camera to check the concrete structures for signs of erosion or gouging. Dam Operations and Maintenance Manager Dale Evenson said the tunnels looked good.
Garrison Dam releases are being slowly lowered from a record 150,000 cubic feet per second. They are currently at about 120,000 cfs.