The cameras let emergency managers track a debris flow in real time, giving them enough warning to evacuate residents before it slammed into the Grove neighborhood.
Traffic cameras installed just days before a sudden deluge of water and debris tore down Beaver Canyon on Sunday afternoon served as an early warning system — and may have saved lives.
That is the assessment of local officials, who say the cameras and other aid rendered by state emergency officials in the days leading up to the flash flood helped provide first responders with enough time to evacuate residents living in the Grove neighborhood near the mouth of the canyon.
“Those cameras helped a ton,” said Beaver Mayor Matt Robinson. Robinson, who was teaching Sunday school when he and the teens noticed the flood on live feeds from their phones, added that the early warning was a factor in preventing any loss of life.
As the cameras captured the flood waters filled with mud, trees and vehicle-sized boulders surge over diversion dams and rush toward town, city and county officials started evacuating residents living in vulnerable areas.
Local officials had asked the state for the cameras and monitoring equipment as a way to prepare for likely flooding from the burn scar left by the Cottonwood Fire that scorched nearly 100,000 acres in the mountains east of Beaver.
Les Whitney, Beaver County’s emergency management director, noted that crews strategically placed two cameras up the canyon — one at the 8.5-mile mark and a second downstream unit at about the 2-mile mark. A third camera was placed in North Creek Canyon.
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The cameras, which were installed on July 15, allowed Whitney and other officials to track the flood’s progress down the canyon in real time.
“We already started evacuating when we saw the [flood water] hit the first camera,” Whitney said. “When it hit camera number two, we knew it was big trouble.”
Whitney and Robinson say the cameras provided them with just enough time — about 75 minutes — to clear the Grove area, where residents living in about 200 homes were evacuated before the debris flow struck and inundated the residential neighborhood.
Weathering the storm
Whitney recalls standing on Navajo Trail Bridge and hearing the roar of the water cascading toward him.
“All of a sudden, the water came around the corner and was headed right at me,” he said. “And there were a lot of full-size trees and other debris that began hitting the bridge and running over its edges.”
Fortunately, he added, both he and the bridge weathered the onslaught.
Glen Merrill, hydrologist with the National Weather Service’s Salt Lake City office, said the deluge was driven by a relatively short cloudburst over the Cottonwood Fire burn scar, where steep mountain slopes had been stripped of vegetation that would normally absorb the rainfall and slow its flow.
In roughly 30 minutes, he said, the storm dropped nearly an inch of rain and the totals in the area neared or exceeded an 1.5 inches at the 45-minute mark, which set the stage for the punishing flood.
“It’s not just water that is a problem,” Merrill said. “In the post-wildfire landscape, burned-off canopy and hydrophobic soils turn hillsides into chutes for mud, ash and logs.”
As bad as the flood was, Whitney said, the state aid prevented a much worse outcome.
State emergency officials tapped disaster funds approved by the Legislature to supply the cameras, heavy equipment and other resources to support Beaver and other rural counties as the monsoon season approached.
“The success of the response was rooted in coordination between the state, National Weather Service and local officials,” said Hillary Koellner, deputy commissioner of the Utah Department of Public Safety.
More flooding possible
Despite the successful evacuation, the aftermath remains a significant challenge for the community.
Officials estimate around 200 homes were damaged, with at least one residence swept away. While approximately 20 people sought refuge at an American Red Cross shelter at Beaver High School, many others stayed with family and friends, according to Whitney.
As of late Monday, he added, a destroyed water line continues to leave many city residents without potable water. The Beaver County Sheriff’s Office is warning the community not to drink, cook or wash with tap water due to contamination risks. Volunteers, nearby cities and The Church of Jesus Christ of Latter-day Saints have stepped in to deliver pallets of water to a distribution center by the city office pavilion.
On Tuesday, the Utah Department of Transportation said that State Route 153, which goes up Beaver Canyon, was closed indefinitely.
Still, more trouble could be looming.
Officials are closely forecasts as the National Weather Service projects an 80% to 90% chance of rain for Wednesday. Because the burn scar remains highly susceptible to flooding, crews are on high alert for additional debris flows.
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