"In south Texas, where the Rio Grande divides the United States from Mexico, three of the last remaining sections of border fence -- approved more than five years ago -- remain unbuilt."

"Unlike many existing sections, those in limbo would be constructed within the floodplain. They would stretch a total of 7 miles and skim the southern edge of three Texas towns -- Roma, Rio Grande and Los Ebanos.

Mexican officials, border town mayors, environmental groups, residents and some congressional leaders remain concerned that those projects could potentially push Rio Grande floodwaters into Mexican towns and block wildlife corridors."

April Reese reports for Greenwire January 23, 2013. [2]