Organ Pipe Cactus National Monument is a 517 square mile national monument that includes approximately 33 miles of the US/Mexico border.

Below is the page that describes the border fence. From the 1990s, the park had problems with illegal off-road driving through the desert by smugglers and others. In 2002, a park ranger was shot and from then until 2014 the park was largely closed off to the public. During that time, vehicle barriers were constructed and also a short section of pedestrian fencing. That has made a big difference.

International Border Vehicle Barrier - Organ Pipe Cactus National Monument (U.S. National Park Service)

www.nps.gov

Monument Timeline - Organ Pipe Cactus National Monument (U.S. National Park Service)

www.nps.gov

While it was touted as a success even in right leaning Washington Times, it might be a center of controversy again.

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www.washingtontimes.com

The issue now is environmental

There Is No Border Crisis Here

In many places a solid and impenetrable wall is actually the WORST solution to an over-hyped “border crisis”. Here’s a strong case for why what we’ve already done is more th…

Jan Emming

There is not much in the way of roads in the US side, but there is a highway close on the Mexican side. Hence, the recent technique of having an entire bus load of asylum seekers getting dropped off to walk across the border and wait to get processed.

Border Patrol video shows migrants crawling under fence into U.S.

A group of 84 men, women and children were dropped off by a tour bus on a Mexican highway before they crossed.

NBC News

At least 17 people died in 2018, presumably mostly in the desert heat. So that would likely dissuade some of those trying to evade detection, though perhaps less those who want to mostly cross the border and give themselves up.

163 border-crossers detained by Border Patrol in often deadly Az desert

A group of 163 suspected illegal migrants was intercepted Saturday by Border Patrol agents in a remote stretch of Arizona desert west of Tucson — the third large group found in about a month in a wilderness where water is rare and crossings are frequently deadly.

TucsonSentinel.com

It is an ecologically sensitive area and border barriers have an effect on that ecosystem.

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Baker Institute

With as few as 100 left, Southern Arizona turtle wins endangered species status

In the U.S., the only natural habitat for the Sonoyta mud turtle is Quitobaquito Springs in Southern Arizona.

This is Tucson