Firefighters largely have contained Northern California's 4,168-acre Tennant fire, which was contributing to the smoke blowing into the Rogue Valley in recent days.

Firefighters largely have contained Northern California's 4,168-acre Tennant fire, which was contributing to the smoke blowing into the Rogue Valley in recent days.

About 70 percent of the fire, which is some 30 miles west of Yreka in the Klamath National Forest, was encircled by a fire line Wednesday, according to fire officials. Firefighters were mopping up hot spots and strengthening the fire line, they added.

The objective is make sure the fire stays within the containment lines while minimizing fire damage to bald eagle nesting and winter roost habitat, historic and prehistoric resources, and riparian areas adjacent to Butte Creek, officials said.

Full containment is expected by Saturday.

The estimated cost of battling the blaze is $1.7 million. The cause of the fire still is under investigation.