4Salt,

I used to have a file card pinned on my wall with the River Mile designations of each of these and other locations. It got stored away during some office move I suppose, so I'm going on memory. I do believe Rockport to Marblemount is a full 10 mile drive on Hwy 20 and then 14 to Newhalem. If these approximations aren't close enough I can nail them down to the closest meter with TOPO and lat.:long.

Sg