Over the Top Concrete

by Glen McDonald, P.E., Chf. of the State Water Projects Bureau; Montana Dept. of Natural Resour. and Conservation, Helena, MT,
Douglas Yadon, P.E., (M.ASCE), Dir. of Engrg.; ESA Consultants Inc., Bozeman, MT,


Serial Information: Civil Engineering—ASCE, 1998, Vol. 68, Issue 1, Pg. 72-75


Document Type: Feature article

Abstract: The 60-year-old Tongue River Dam in southeastern Montana is undergoing extensive dam safety and reservoir enlargement modifications. Major features of the project include a 60,000 cfs roller compacted concrete stair-step emergency spillway over the dam, a 40,000 cfs labyrinth weir primary spillway, and a new primary outlet tunnel. The article focuses on the use of roller compacted concrete for the emergency, over-the-top spillway. At 72.5 ft from crest to stilling basin floor, the spillway will be one of the highest roller compacted concrete overtopping protections built on an existing earthen-fill dam.

Subject Headings: Dam safety | Montana | Renovation | Reservoirs | Roller-compacted concrete | Spillways

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