ND 13's concurrency with ND 1 continues southward for four miles, then ND 1 continues to head south toward Oakes, while ND 13 forks to the east and travels to Gwinner, entering Sargent County in the process.
For a distance of four miles, ND 13 aligns with ND 1 before heading south towards Oakes. Concurrently, ND 13 turns eastward and proceeds to Gwinner, crossing into Sargent County along the way.