Unguarded Bridges at TX Border

Why wade across the Rio Grande when you can walk across a bridge instead?

There are two small foot bridges along the West Texas border with Mexico.  Actually they are grade control structures managed by the International Boundary and Water Commission.  Regardless of what you call them, fresh footprint tracks can be seen on them from Mexico to the US hinting that they are used for illegal crossings.

The most absurd news about these bridges is that they are unguarded!

The bridges are owned by both countries, Texas or the U.S. government cannot take them down.  It would have to be an agreement by both the U.S. and Mexican government.  Consider that a long shot.