Hurricane Polo's Remnants Push New Mexico Dam Near Failure, Trigger Flood Watches Across 10 States

Hurricane Polo made landfall in Mexico's Baja California Sur late Monday night, September 28, and by midday Tuesday the National Hurricane Center had tracked its center into the Mexican state of Sonora, pushing outer bands and tropical moisture across the U.S. border, according to the Epoch Times. The result: flash flooding already underway Tuesday evening across New Mexico and Arizona, with a dam near failure and evacuation orders in place.

The most urgent threat is the McLeod Dam near the towns of Garfield and Salem in Doña Ana County, New Mexico. The National Weather Service issued what it called "a particularly dangerous situation," telling residents to seek high ground immediately, according to the Daily Mail. Officials warned that anyone in low-lying areas below the dam, or traveling Highways 187 and 390, faced life-threatening flash flooding if the structure failed.

Evacuation orders went out for Rincon, Salem and Garfield, and an evacuation center opened at the Radium Springs Community Center in Las Cruces, roughly 60 miles from the danger zone, per KOAT reporting cited by the Daily Mail. CBS News reported that water had already spilled over a 20-foot dam in New Mexico as of Tuesday evening, prompting emergency crews to push residents out of harm's way.

The flooding isn't confined to one county. The National Weather Service issued a flash flood warning for Socorro County, New Mexico, until 7:45 p.m. MDT Tuesday, after trained spotters reported water flowing across roads on White Sands Missile Range, according to Hindustan Times. Radar showed up to 2 inches of rain had already fallen there, with another inch possible.

In Arizona, Pima County closed multiple roads including South Houghton Road, East Sahuarita Road and South Wilmot Road as rising water hit the Tucson area. The National Weather Service in Tucson issued its own flash flood warning covering Tucson, Sahuarita, Green Valley and Davis-Monthan Air Force Base until 6:30 p.m. MDT Tuesday, Hindustan Times reported.

AccuWeather Chief Meteorologist Jon Porter said the scale of the threat was serious. "In some places, especially in New Mexico, this may be the most dangerous flash flooding risk in the last five years or more," Porter said, according to the Daily Mail.

Flood watches now stretch across 10 states, according to both the Epoch Times and the Washington Post: Arizona, New Mexico, Utah, Colorado, Texas, Oklahoma, Kansas, Nebraska, Iowa and Missouri. The Washington Post reported the watches covered around 28 million people as of early Tuesday. The Daily Mail added that an upper-level low-pressure system is also pulling in leftover moisture from Hurricane Odalys, creating what AccuWeather described as a "triple flood threat" that no other source in this roundup mentioned by name.

Most areas are expected to see 2 to 3 inches of rain, with localized totals of 5 to 6 inches, the Epoch Times reported, citing National Weather Service forecasters in Phoenix and Albuquerque who flagged rainfall rates up to 2 inches per hour as the real danger, not total accumulation. The Daily Mail reported the weather service's worst-case scenario put isolated totals as high as 18 inches. A civil emergency message specifically warned Ruidoso, New Mexico residents of increased landslide risk, and wind advisories covered parts of New Mexico and Texas with gusts up to 55 mph. Tornado risk exists for southeast New Mexico and west Texas, though no tornado warnings had been issued as of late Tuesday afternoon.

The storm threat isn't over. AccuWeather meteorologists told the Daily Mail that extreme rainfall and flash flooding will continue into Wednesday night across most of New Mexico, and the broader flood threat is expected to persist into Friday, potentially bringing more than 2 inches of rain as far as Arkansas, Illinois, Indiana, Michigan and Wisconsin.

This flooding occurs amid ongoing scrutiny of how the country handles floodplain risk generally. David Richardson, the senior political appointee who ran FEMA during the deadly July 2025 Camp Mystic floods in Texas Hill Country, wrote in an opinion piece for the Daily Signal that federal flood maps are "snapshots in time" that set minimum insurance standards, not predictions of where flooding will strike. He called that explanation "bureaucratic obfuscation" and argued that federally subsidized flood insurance makes it easier to keep building in floodplains, shifting the cost of eventual disaster onto taxpayers. Richardson noted that the New York Post reported Texas Rangers are investigating whether crimes, including manslaughter, were committed in the Camp Mystic deaths. That investigation remains open. No charges have been filed and no finding of criminal guilt has been made.

Back in New Mexico, the immediate question is whether the McLeod Dam holds through the next round of storms. The National Weather Service's warning window on the dam ran through at least 6:45 p.m. MDT Tuesday, but with heavy rain forecast to continue into Wednesday night, officials have not said when the threat to Doña Ana County residents will fully clear.