The U.S. Forest Service has ordered an emergency closure for portions of the Tahoe National Forest near a remote Northern California wildfire that has burned more than 11 square miles of steep, wooded terrain.

Heavy smoke from the fire 10 miles northeast of Foresthill at times has blanketed portions of the Sierra Nevada foothills, the Sacramento Valley and stretched to Lake Tahoe.

An air quality warning has been issued for Placer County, northeast of Sacramento. The Forest Service says smoky conditions might last through the weekend.

The fire is burning along a tributary of the Middle Fork of the American River and is not threatening homes.

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