Key takeaway: About 72 hours of historic rain from October 30 to November 1, 2026 flooded central and northern Arizona and southwest Colorado. Oak Creek flooded Sedona, the Verde River flooded Cottonwood, and the San Juan River at Pagosa Springs came within a foot of its 1911 flood record. Arizona declared a statewide emergency. The floods are serious, but they will not end the Colorado River shortage. This guide explains what happened, why desert landscapes flood so fast, and what it means for water in the West.
What happened: a timeline
| Date (2026) | Event | Source |
|---|---|---|
| Late October | A first storm floods southwest Colorado, damaging roads, bridges and utilities. | The Colorado Sun |
| Oct 30 | About 72 hours of historic rainfall begins across Arizona. | KJZZ |
| Oct 31 | Colorado Gov. Jared Polis requests about $27 million in federal aid for the earlier flood damage. | The Colorado Sun |
| Nov 1 (Sun) | Mass evacuations are ordered in Sedona as Oak Creek Canyon floods, and DPS crews make rooftop rescues. More than 1,000 homes are under evacuation in Archuleta County, Colorado. The San Juan River crests at 16.8 ft in Pagosa Springs at about 8 p.m. | KJZZ; KNAU; The Colorado Sun |
| Nov 2 (Mon) | Gov. Katie Hobbs declares a statewide emergency and releases $200,000 in state relief funds. | KJZZ |
Arizona: Sedona, Oak Creek and the Verde Valley
Sedona ordered mass evacuations on the morning of Sunday, November 1, as Oak Creek Canyon flooded. Arizona Department of Public Safety crews carried out rooftop rescues. State Route 89A between Sedona and Kachina Village and State Route 87 near Winslow were both closed. Local reports put Oak Creek’s peak at roughly 16–18 feet near Sedona (KNAU, which called the flooding “unprecedented”) and above 21 feet at Page Springs (FOX 10 Phoenix). The readings differ because they come from different points along the creek.
Downstream, the Verde River flooded homes in Cottonwood. Winslow, Cottonwood and Camp Verde were under evacuation orders, and Yavapai County reported more than 60 rescues (ABC15 Arizona).
Hobbs’ statewide declaration said seven counties and five tribal nations had been affected. Apache, Gila and Yavapai counties declared their own emergencies, as did the cities of Camp Verde, Prescott and Sedona. The Arizona Department of Transportation said the flooding exceeded its capacity for debris removal and traffic control, so it asked the Federal Highway Administration for help (KJZZ).
Colorado: the San Juan River nears its 1911 record
In Pagosa Springs, the National Weather Service forecast the San Juan River to reach 21.84 feet. That would have been more than 4 feet above the 1911 flood that wiped out much of the town. The river actually crested at 16.8 feet around 8 p.m. on November 1. That was below the forecast, but still above major flood stage and close to the 17.8-foot mark of 1911 (The Colorado Sun).
More than 1,000 homes in Archuleta County were under mandatory evacuation, many for the second time in two weeks. Evacuations were also ordered in Rio Grande and Conejos counties, and for anyone living within half a mile of the La Plata, San Juan or Animas rivers in San Juan County. Sewage entered the San Juan River, and all incoming traffic to Pagosa Springs was stopped. Some vote centers and ballot drop boxes in La Plata and Archuleta counties were moved ahead of Election Day.
Why does the desert flood so fast?
Three things combined:
- The ground was already saturated. After days of rain, incident commanders in Colorado said the soil had very little capacity left to absorb water. New rain ran off almost entirely.
- The terrain is steep and rocky. Red-rock canyons like Oak Creek Canyon and the slopes of the San Juan Mountains send water into creeks within minutes. Water also pooled well outside normal drainage channels.
- The storms came back to back. Southwest Colorado was hit before it had repaired roads and bridges damaged in late October. Debris carried downstream increased the risk to bridges that were already weakened.
Several outlets have asked whether the developing El Niño is behind the storms. No attribution study has been published for this event yet, so treat any link as unconfirmed for now. You can follow the latest ENSO signals on our live ENSO tracker and in our Super El Niño guide.
Will this rain refill Lake Mead?
Not in any meaningful way. Most of the Arizona floodwater flows into the Verde and Salt river systems, not the Colorado River’s main reservoirs. Some San Juan River floodwater will reach Lake Powell, but a single storm cannot make up for years of deficit. Lake Mead stood at about 1,039 feet (24% full) on November 1, 2026 (USBR data via LakeLevelNow).
The water that refills the system comes from mountain snowpack. A winter storm warning was in place for the San Juans above 10,000 feet, where 12–18 inches of snow was forecast. That kind of slow-melting snow matters more for 2027 supplies than flash runoff does. For the policy side, see our guides to the Colorado River shortage and the 2027–28 operating rules and the November Lake Mead watch, or track conditions on our Western Water Crisis Dashboard.
What residents should do
- Follow official orders from county emergency management, and leave before the water rises. Responders warned that helicopters may be grounded during the worst of a storm.
- Never drive into flooded roads or low-water crossings.
- Stay out of rivers where sewage has been reported, and keep pets out too.
- Photograph any damage for insurance claims and for federal aid applications.
See it in 60 seconds: Southwest Flash Floods (Nov 2026) web story. You can also track US flood and rainfall anomalies on our US Climate Extremes Tracker, and read about another recent event in Florida’s Space Coast flash flood.
Sources
- KJZZ, “Hobbs declares statewide state of emergency over flash floods,” Nov 2, 2026. kjzz.org
- The Colorado Sun, “Southwestern Colorado river forecast to top 1911 flood record,” Nov 1, 2026 (updated). coloradosun.com
- KNAU Arizona Public Radio; ABC15 Arizona; FOX 10 Phoenix: reporting on Oak Creek and the Verde Valley, Nov 1–3, 2026.
- U.S. Bureau of Reclamation, Lake Mead elevation data (via LakeLevelNow), Nov 1, 2026.
This is a developing story. Figures reflect reporting as of November 3, 2026.