The barriers — floating buoys and cables — aim to deter illegal crossings, counter drug trafficking and protect agents in an area officials call a "capability gap." The move, made possible by Noem's waiver of federal environmental policies, underscores the administration's controversial approach to border security while reigniting debates over ecological and legal consequences.

New barriers target "capability gaps" in waterways

U.S. Customs and Border Protection (CBP) framed the project as necessary to address vulnerabilities in waterways rife with smuggling, trafficking and dangerous crossings. "A capability gap has been identified in waterways along the Southwest border where drug smuggling, human trafficking and other dangerous and illegal activity occurs," CBP stated in a press release.

The administration emphasized the barriers would create "safer conditions for patrolling agents" and reduce life-threatening river crossings. Secretary Noem, in a congressional hearing earlier this year, defended such measures as critical to achieving "operational control of the Southern border," a priority of President Donald Trump's executive orders.

The brown-water obstacles mirror 2023 efforts by then-Texas Governor Greg Abbott, whose buoy installations were blocked under the Biden administration over safety and sovereignty concerns. "We're going to continue to move forward with that infrastructure because it does slow down traffic, it sends a message and it gives our officers more opportunities to truly address the security concerns we've had in the past," Noem told lawmakers in May.

Bypassing environmental laws: A divisive move

To expedite construction, Noem invoked Section 102 of the Real ID Act, which permits the suspension of environmental reviews under national security claims. This is her sixth barrier-related waiver since Trump's January 2025 inauguration, following a similar action in California in April.

Environmental groups condemned that earlier waiver, citing risks to ecosystems and water quality. "Waiving environmental, cultural preservation and good governance laws...will only cause further harm to border communities," said Cameron Walkup, an Earthjustice advocate. The nonprofit did not immediately comment on the Rio Grande waiver, but Biden-era litigation over Texas buoys — a case dropped after Trump's election win—hinted at renewed clashes.

The administration maintains the barriers save lives while curbing crime. "The numbers don't lie — under President Trump's leadership, @DHSgov and @CBP have shattered records," Noem tweeted in June, citing a historic low of 25,243 border encounters nationwide, down 12% from February 2025.