Typical 3 day trip due to long shuttle. Lowest recommended 200 cfs -- Can be run in a raft even at low water levels (I ran it in a big fat gear boat at 140 cfs last year although I would not recommend it to anyone).
Solis River Access (take-out) is a long dirt road from the pavement, requiring 4 wheel drive.
See also
Big Bend National Park and their descriptive site,
Floating the Rio.
See also the descriptions in
Southwest Paddler.
Put-in is approximately 1900' elevation.
Take-out is approximately 1880' elevation.
Therefore total elevation change is approximately 120'.