LA 70 then heads north into Assumption Parish, where it runs through Pierre Part.

LA 70 then continues northeastward through rural Ascension Parish as a two-lane, undivided road.

[1] Originally, LA 70 was a much shorter route serving only Assumption Parish and only approximately 17 miles in length.

Until the late 1950s, the road went from Pierre Part to Paintcourtville, with its southern terminus being near Belle River in Assumption Parish (four miles south of Pierre Part) and northern terminus at LA 1.

[citation needed] Major junctions The entire highway is in Assumption Parish.