The department said on X, formerly Twitter, that crews were conducting “proactive fire operations” so they could protect the containment lines that had been set up around the growing Valley Fire. Boise Fire said it appreciated the “concerned calls” but wanted to assure residents they weren’t seeing a change in the fire’s behavior toward the city.

A fire was burning Friday morning in the Boise Foothills near the edge of the city. The Valley Fire was estimated at 25 acres as of 7:15 a.m., according to the Bureau of Land Management. It’s about a mile east of the city — near the intersection of Idaho 21 and East Highland Valley Road — and moving toward Warm Springs Mesa.

The fire started about a mile east of the city — near the intersection of Idaho 21 and East Highland Valley Road — and was moving toward a string of subdivisions along Warm Springs Avenue. Warm Springs has been closed from Eckert Road to Idaho 21.