Its total length is approximately 7.75 miles (12.47 km).

NM 109's southern terminus is at NM 346 southeast of Bosque, and the northern terminus is at NM 309 near Belen.

The at grade crossing with the BNSF railway is to be converted to a grade separated crossing.

Construction is expected to begin in December 2021.

[1] The entire route is in Valencia County.