My Rio Grande thinking is almost entirely about the bits in New Mexico, but this, happening now at Big Bend, on the US-Mexico border, is worthy of note:

Bulldozers have begun plowing up ground at the mouth of Big Bend national park’s famed Santa Elena Canyon as part of the Trump administration’s multibillion-dollar “smart wall” expansion on the US-Mexico border, according to new footage taken by activists who have been monitoring the site.

h/t Jack Schmidt