It's about half way between the I-10 bridge and the Lake Houston dam.
Most of the channel is 12-18' deep from I-10 past Banana Bend and up to the railroad bridge just north of the new Hwy 90 bridge. At that point it can be as shallow as 3-4' for about half a mile then good and deep from there up to the dam.
There are several beaches an island and 3 bars accessible from the river.
Only way past the dam is by trailer