GRAND JUNCTION, Colo. — The waters are running faster now.

This week, as temperatures across Colorado’s Western Slope edged higher, the City of Grand Junction raised yellow flags at River Park at Las Colonias, signaling a shift in river conditions — and a reminder to tread carefully.

City officials announced on April 22 that medium hazard warnings are now in effect at both the east and west ends of the park, which hugs the Colorado River just south of downtown Grand Junction.

“This time of year, conditions on the river can change rapidly,” said Parks and Recreation spokesperson Lisa Cardenas. “Yellow flags are meant to keep people informed — not scared. But they’re also not to be ignored.”

What Yellow Means — And Why It Matters

River Park uses a three-flag system to communicate water conditions to the public:

• Green Flag: Low hazard, recreational use permitted

• Yellow Flag: Medium hazard, caution advised

• Red Flag: High hazard, no public access permitted

As of now, the yellow flag status means inner tubing and river use are still allowed, but visitors are urged to exercise caution and follow posted safety guidelines.

No lifeguards are on duty at the park. Life jackets — required for all water activities during yellow and red flag periods — are available for free at on-site kiosks.

“People should absolutely wear them,” Cardenas added. “Even strong swimmers can get caught off guard in currents like these.”

The Spring Surge: When Beauty Turns Brisk

Every spring, Grand Junction’s rivers swell with meltwater from the San Juan and Elk Mountains to the east, making for dramatic views — and potentially dangerous recreation.

“This is a dynamic river environment,” said Nathan Linsey, a hydrologist with the U.S. Geological Survey (USGS). “What looks like a calm stretch of water one day can become a swift channel the next.”

According to USGS data, flow rates on the Colorado River near Las Colonias Park have nearly doubled in the past two weeks — a typical pattern for late April, but one that still surprises first-time tubers and visitors.

“People underestimate how fast snowmelt can raise the river,” Linsey said. “And that’s when accidents happen.”

A Popular Spot, Especially Now

River Park at Las Colonias — a flagship outdoor destination developed by the city in 2020 — is beloved by locals and visitors alike for its blend of nature and recreation.

It features:

• A man-made lazy river designed for tubing

• Natural riparian areas for birdwatching and walking

• A small amphitheater for summer concerts

• Access points for kayaks, paddleboards, and floaters

On weekends, it draws hundreds. During peak summer months, that number can double.

But this week, the yellow flags are already starting to shape the tone at the park.

“We still had fun, but we stuck to the shallows,” said Melissa Romero, a mother of two who visited on Wednesday afternoon. “I didn’t want to take any chances.”

Safety Comes First — And Is Free

City staff have emphasized that safety equipment is not only recommended — it’s readily available.

Kiosks located near both river access points offer free-to-borrow life jackets in a range of sizes.

A posted sign nearby reads:

“Yellow Flag Alert: Use Caution. Strong currents possible. Life jackets required. No lifeguards on duty.”

In addition to life jackets, the park has launched an awareness campaign on social media and through signage reminding residents:

• Not to use the river alone

• To keep children within arm’s reach

• To secure tubes properly before launching

• To avoid river use altogether if under the influence of alcohol or drugs

“We just want everyone to go home safe,” said Cardenas.

Looking Ahead: Could a Red Flag Be Next?

While current conditions remain moderate, officials are monitoring daily weather and river data closely.

“If we get a sudden heat wave or strong storms in the high country, we could see a red flag posted,” Cardenas said. “And that would mean no tubing, no paddling — the river would be closed to recreation.”

Last year, the park issued red flag warnings three times between April and June, usually following abrupt spikes in snowmelt or flash flood warnings in upstream areas.

But for now, the goal is simply to make sure residents are informed, not discouraged.

“This isn’t about scaring anyone off,” said Romero. “It’s about helping us make better decisions. I’m glad they do this.”