WELD COUNTY, Colo. (CBS4)– Firefighters battled an intense oil rig fire in Weld County on Monday night. The flames reached 30 feet high at one point.

(credit: Scott Sherman)

The oil rig is located off Weld County Roads 35 and 38 near Platteville.

The fire started just before 9 p.m. Monday. Crews used 600 gallons of foam to try to extinguish the fire.

(credit: Scott Sherman)

No one was hurt. All onsite workers evacuated safely.

What started the fire is being investigated.