If one knows the water elevation the boat ramp elevations =:
This is from the COE Page http://www.nwd-mr.usace.army.mil/rcc/reports/garrramps.html
http://www.nwd-mr.usace.army.mil/rcc/boatramp.html For Fort Peck, Garrison, Oahe, Big Bend, and For Randall
Honkerherms
Jeff