Can't find a link to it on the web, but DL has it on good authority that there has been an environmental assessment and a "Finding of No Significant Impact" issued for the border wall along the already-beleaguered San Pedro River. We have heard that there were four alternatives considered, the first being the Army Corps of Engineers (ACOE) and the Border Patrol proposal to "pedestrian fence" the entire stretch from the river bank to Douglas, Arizona, a total of 31 miles. Mind you, BLM doesn't manage this entire stretch, so the EA only considered the small piece under the BLM jurisdiction.
BLM, in a risky concession to wildlife, decided to let them build the wall, but to only allow for vehicle barriers in the wet and dry riparian areas, since everyone knows that the first flood event is likely to wipe out any wall anyway. We suppose this is better than the ACOE proposal to wall the whole thing. Or much, much worse for wildlife than nothing, which was one of the alternatives considered. (The remaining alternative was to only build vehicle barriers, which had reportedly worked quite well in other lands along the border.)
The reason that this is a risky concession is that the Department of Homeland Security can simply take the BLM's decision and determine that it is interfering with the "expeditious construction of the barriers," and waive NEPA under the Real ID Act. Same is true for any lawsuit or appeal of the Decision- mess with DHS and they will surely mess with you. The concerted effort of the current administration to remove the power from the people is terrifying.
There is another way, and we remind you of the Grijalva legislation introduced a few months ago. Call your senators. Write op-eds. Jump up and down. But please, don't just sit there. This is the San Pedro River- beloved biological gem, the last free-flowing river in Arizona, the second most diverse place for mammals in North America.