An aerial view of the Flat Line Fire near US-40 on Sunday evening. Photo: Mike Melton // Utah Fire Info

Update 6:27 p.m.: The Flat Line Fire has been 100% contained.

Update 8:49 p.m.: Crews established 80% containment on the Flat Line Fire on Monday, according to Utah Fire Info. Firefighters will continue to secure the fire line & monitor for any remaining interior hot spots.

Update 1:36 p.m.: The Flat Line Fire was mapped to 25 acres on Monday, down from 85 on Sunday night. Containment has grown from 5% to 30%. Fire personnel are continuing to tie in the perimeter to secure the fire’s edge. Crews from Alta and Draper are on scene.

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TODAY: Some great visuals of the @AltaHotshots working on the #FlatLineFire.
It’s day one of the season for the Type 1 IHC crew 💪@UtahWildfire | @UtahFFSL pic.twitter.com/Qaqsvx6GN3
— 𝐁𝐫𝐢𝐚𝐧 𝐒𝐜𝐡𝐧𝐞𝐞 (@brian_schnee) May 23, 2022

WASATCH COUNTY, Utah — Mike Eriksson, area manager and spokesman for the Utah Division of Forestry, Fire and State Lands told TownLift on Monday morning that he expects containment of the Flat Line Fire near US-40 and Jordanelle to increase, with total acreage decreasing.

“If you were driving up right now, you wouldn’t even know there’s a fire there,” Eriksson said.

“The weather helped us out… I think we got down in the mid-20s up there last night which always helps. And we got the resources we need this morning.”

It currently stands at 85 acres with 5% containment, but Eriksson emphasized that he expects those numbers to change on Monday.

“I think the acres will probably go down a little bit and by the end of the day today, containment should go way, way, way up.”

It was confirmed Sunday that the fire was human-caused, however, the specifics remain under investigation. It took hold late Sunday afternoon, with US-40 shutting down for a short period of time so an air tanker could drop retardant on the blaze.