re: Why not turn the Rio Grande into an obstruction? RGVA

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Is there enough water?

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I think there probably is,and it also has a lot of elevation drop,which works well for building hydro electric dams.

People now,don't realize how shallow of a river that most of the Tennessee was before TVA did their thing,many places you could wade right across. Lots of rapids and waterfalls.

If You read" The Life And Times Of Davy Crockett", He tells about being with General Jackson's Army,in The War Of 1812/Creek War.
They were wading their horses across the river at Muscle Shoals,but most of the horses got their hooves caught in the cracks in the rocks and couldn't be dislodged. They butchered the horses right there in the river for meat.
I have made 2 dives there,and can say for a fact,the cracks in those rocks have a lot of bones. I can't say if they are from Jackson's Horses.