FREMONT COUNTY, Colo. (CBS4)– Fire crews are battling a wildfire burning in Fremont County.

The North Millsap Fire grew to 22 acres overnight Friday into Saturday. Lightning caused the fire about five miles north of Canon City.

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The North Milsap Fire burning in Fremont County (credit: CBS)

Fire officials reported the fire was 20% contained as of Saturday night.

BLM Colorado Fire has multiple crews attacking the fire which is burning in rugged terrain in Ponderosa Pine and Gamble Oak.

A helicopter is making water drops on the fire.

The North Milsap Fire burning in Fremont County (credit: CBS)

Smoke may be visible throughout the day in Fremont and Teller County due to hot, dry and windy conditions.

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The fire is not threatening structures.

Wildfire Resources

– Visit CBSDenver.com’s Living With Wildfire section.

Wildfire Photo Galleries

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– See images from the most destructive wildfires (Black Forest, Waldo Canyon, High Park and Fourmile) and largest wildfire (Hayman) in Colorado history.