I'm going to paddle the Colorado from Columbus (SH 71 Business) to Altair (US 90) on Wednesday, July 14. The distance is roughly 27 miles. There are no significant hazards in this stretch of the river and the launch and landing sites are both easy to access and use (concrete ramps on both ends, with perhaps a bit of high water residual silt at the bottom).
Plan is to meet at the US 90 ramp at 0730 (east/river left bank) and then shuttle up to Columbus. This stretch contains the Columbus Loop (upper six miles). Respond to me by e-mail if interested.
"He who hears the rippling of rivers in these degenerate days will not utterly despair." H.D. Thoreau