How Easy It For Illegals To cross Into The U.S: How About An Unuarded Bridge?

From The El Paso Times: On each side of a towering West Texas stretch of the $2.4 billion border fence designed to block people from illegally entering the country, there are two metal footbridges, clear paths into the United States from Mexico.
The footpaths that could easily guide illegal immigrants and smugglers across the Rio Grande without getting wet seem to be there because of what amounts to federal linguistics. While just about anyone would call them bridges, the U.S.-Mexico group that owns them calls them something else...
How dangerous is it? Well the Border Patrol doesn't man the bridge: But patrols in such an open area can appear to be sporadic to the average observer as marked Border Patrol trucks cruise up and down a river levee road along the border.
The crossings are owned by both the United States and Mexico and are needed for workers to maintain and occasionally fix cement structures that support the bridge, Spener said. Any changes to the structures, she said, would have to be approved by officials in both countries. And no one has ever asked to secure the bridges or remove them, she said.
"We would be happy to work with Border Patrol if they have security concerns they've identified," Spener said. "It would be a challenge, but we'd be happy to discuss it."
Cordero said he's not aware of any requests by Border Patrol or the Department of Homeland Security to secure the crossings. But still, he concedes, it would be nice if there was more security around the remote crossing.
http://www.elpasotimes.com/juarez/ci_15826769
So, any terrorist or drug dealer can just walk over the bridges and come into the the U.S. unchecked. Wonderful.
It would be nice if they put up a barrier to the bridge or dismantle it. This is one way to secure the border.