Hayden Fire

The lightning-caused Hayden Fire was spotted in Yellowstone National Park Tuesday morning. 

A small fire has started in the Hayden Valley of Yellowstone National Park, sending up a plume of smoke that may be visible from park roads.

Called the Hayden Fire, it was first spotted Tuesday morning from the Mount Washburn fire lookout, according to a park news release. It was caused by lightning and estimated to be burning about one-tenth of an acre of grass and shrubs.

Smoke may be visible from the Grand Loop Road between Canyon Village and Mud Volcano, the release said. The fire doesn't pose a threat to people and all roads remain open.

It's the first fire this year in the park. There were eight fires last year that burned less than an acre in all.

Michael Wright can be reached at mwright@dailychronicle.com or at 582-2638. Follow him on Twitter @mj_wright1.