American Society of Civil Engineers


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) and Douglas Yadon, P.E., M.ASCE, (Dir. of Engrg., ESA Consultants Inc., Bozeman, MT)

Civil Engineering—ASCE
, Vol. 68, No. 1, January 1998, pp. 72-75

     Purchase Information
     Permissions for Reuse  

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.


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