The hard part will be just trying to build a fence along a river that curves around like a snake.
The argument about water and the farmers that was mentioned in one of the articles above, can you enlighten us on any problems you may see that the fence would create for the farmers?..... Out side of blocking them from the suction side of the their pumps I don’t see a major problem. But I can see problems with maintenance/damage/repair to the suction side should the fence not provide for an axcess gate.
I don’t see any problem getting water with a wall in place. We’ve already been fighting with Mexico for years over their unlimited pumping of the Rio Grande. That part won’t change. We’ve had water treaties with Mexico for decades. Lying, cheating and stealing has always been standard proceedure for Mexico...and that’s just their government.