San Luis Valley residents are being urged to watch river conditions closely as another storm approaches this weekend, raising concerns about renewed flooding along waterways already affected by October's heavy rain.

An updated National Weather Service Pueblo forecast discussion issued Thursday, October 29, at 2:29 p.m. MDT describes a very high potential for another round of flooding affecting the Rio Grande, Conejos River and San Antonio River.

The outlook represents a stronger warning about the potential impact of the approaching storm, but it is not a confirmation that a new flood has begun.

When the storm could arrive

The primary period of concern is Saturday night, October 31, through Monday, November 2, with the greatest runoff concerns developing as precipitation falls on already wet mountain terrain.

Forecasters anticipate roughly one to three inches of liquid precipitation in portions of the San Juan Mountains, although amounts and exact locations remain uncertain.

With snow levels initially expected above 12,000 feet, precipitation may fall as rain across elevations that ordinarily receive snow at this time of year.

Rain falling on existing snow and saturated ground can move into creeks and rivers more quickly, potentially sending another surge downstream.

Snow levels are expected to fall later Sunday into Monday, with wet mountain snow possible at higher elevations.

Communities along the Rio Grande

From South Fork through Del Norte and Monte Vista to Alamosa, residents near the Rio Grande should follow updated forecasts and river information, especially where flooding has already damaged roads, banks, bridges or property.

The Conejos River corridor, including areas near Mogote and Conejos Ranch, also deserves close attention, along with the San Antonio River.

These are areas of concern based on the river systems identified in the forecast; new flooding at each community has not been confirmed.

Road conditions and evacuations

As of the latest information available for this report, US 160 over Wolf Creek Pass had reopened with repair-related traffic restrictions, while US 285, CO 112 and CO 17 had been reported reopened.

Some Rio Grande National Forest roads remain damaged or impassable, including Forest Service Road 250 near the Alamosa Guard Station and Road 380 near South Fork.

No new evacuation order or highway closure was independently confirmed for this update, and existing local restrictions should be checked directly before traveling.

What residents can do now

People with homes, cabins, livestock or equipment near waterways should review their plans before the weekend rather than waiting until water begins rising.

Keep phones charged, identify a safe route away from low-lying areas, and avoid crossing water-covered roads or damaged bridges.

Those with private wells affected by flooding should also take precautions before using the water for drinking or cooking.

Because official live river-gauge readings could not be independently verified for this update, no new crest time or river-flow increase can be reported with confidence.

Where to follow updates

Check the National Weather Service Pueblo forecast discussion and local emergency-management announcements for changing weather and evacuation information.

For highway conditions consult COtrip, and for forest-road access consult the Rio Grande National Forest conditions page.

The key change today is the increased concern about another round of flooding, not a newly verified flood emergency.

The San Luis Valley Beat will continue monitoring official announcements as the November 1–2 storm approaches.