UTAH FLOOD WATCH

Hydrologist optimistic about Salt Lake County runoff picture as thunderstorm threat looms

May 30, 2023, 6:27 AM | Updated: Oct 19, 2023, 10:22 am

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This Monday, June 10, 2019, photo shows the Big Cottonwood Creek, in the Big Cottonwood canyon, near Salt Lake City. The summer's melting snowpack is creating raging rivers that are running high, fast and icy cold (AP Photo/Rick Bowmer)

(AP Photo/Rick Bowmer)

SALT LAKE COUNTY, Utah — A longtime hydrologist expressed optimism Monday about the potential for the county to avoid any further runoff and flooding issues. However, the risk still existed, particularly along Big and Little Cottonwood creeks with an upcoming thunderstorm threat.

Brian McInerney, a hydrologic consultant with Salt Lake City Public Utilities, told KSL the moderate weather in recent weeks had been ideal in a year with record snowpack.

“You couldn’t have scripted a better weather scenario to bring down 200 percent of median river flows that you see right now,” McInerney said.

He said most of the significant creeks in Salt Lake County appear to be trending in a positive direction.

“Emigration (Creek) is roughly out of snow to produce any large, damaging peak flows,” McInerney said. “Red Butte is out of any snow to produce any big flows. City Creek is mostly out of the woods unless we get a big rain event.”

But he said the situation was different for Big and Little Cottonwood creeks.

“If we get hot weather with bright sunshine for a week to 10 days, we could produce some flooding in both of those,” McInerney said.

He noted, however, that the current forecast called for continued moderate temperatures with clouds and the potential for thunderstorms Thursday through the following Wednesday.

According to McInerney, a significant thunderstorm that hits over the Cottonwood canyons could also prove problematic.

“If we get a rain event that puts down an inch to maybe an inch-and-a-half of rain, now we’re up to 4 inches of water coming out of the canyon at once, and those channels can’t handle that.”

However, if the creeks avoid problems in the next two weeks, McInerney said he was hopeful for the future.

“At that point, you have to ask yourself do we have enough snow to produce damaging flows, and I don’t think so,” McInerney said. “I think we’ll be close to melting out enough snow that we won’t have the damaging peak flows.”

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Hydrologist optimistic about Salt Lake County runoff picture as thunderstorm threat looms