SAN LUIS — The first section of President Trump’s border wall in Arizona is rising near Yuma.

After years of crowds shouting “build the wall” at political rallies and countless condemnations of the wall as xenophobic or a “vanity project” for Trump, the wall has taken the shape of square, metal poles jutting 30 feet up from the ground in San Luis, a border town south of Yuma.

As early as this month, similar poles could rise along the Cabeza Prieta National Wildlife Refuge, Organ Pipe Cactus National Monument and across the San Pedro River.

Despite the wall being the centerpiece of the Trump administration’s immigration agenda, relatively few details about it were announced publicly. Instead, information has come in dribs and drabs from documents disclosed in a federal lawsuit and terse news releases.

Questions remain about whether a wall across the San Pedro River would have sluice gates to allow water to pass through, or whether the gaps between the poles would be big enough to let animals migrate on Cabeza Prieta and Organ Pipe.

The view from up close shows the wall in San Luis dwarfing the panel fencing it replaced, which stood 10 to 15 feet high.