FARMINGTON — Two controlled burns started Wednesday and will last through the weekend.

The Bureau of Land Management Farmington Field Office is burning piñon and juniper trees left over from a previous tree-thinning project, according to a BLM news release.

The agency will burn about 40 to 60 piles of trees in Mud Canyon, which is north of N.M. Highway 173, about 8 miles east of Aztec. Also, about 80 to 100 piles of trees will be burned in Vereda Canyon, which is north of N.M. Highway 173, about 12 miles east of Aztec, according to the news release.

The BLM said smoke may be visible in Aztec and Navajo Dam.

As many was 15 BLM firefighters will be on site during the burns.