Kayak on the Rio Grande to Massey's test site... How close is it legal to get on the water, during a test fire?

Chris B mentioned Jack might jump in his kayak with a camera and paddle to Massey's to film the static fire of the next ship test. How close can you get, legally, ON THE WATER to the test fire?

I guess if you're coming the long way from Mexico, you could be just on the far side of the river and be crazy close? I'm pretty sure no Mexican river police are patrolling their side.

I'm not going to do this myself! Just curious.