CASTLE ROCK — Investigators from the National Transportation Safety Board are expected to return Tuesday to the site of a single-engine plane crash north of Castle Rock.

Authorities say a pilot was seriously injured when the plane clipped power lines in thick fog and crashed into a gully on Monday.

Investigators are trying to determine if fog or icy conditions played a role in the crash.

The Denver Post reports that a woman was the plane's lone occupant. and that no one on ground was injured.

The crash happened just after 7 p.m. The plane crashed into a ravine between Sapphire Pointe Boulevard and Diamond Ridge Parkway, according to the Post. The area is east of Interstate 25 and north of Founders Parkway.

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