The B8031 links the B822 at Frew Toll to the A873 at Mains of Burbank, crossing the floor of the Forth Valley. It was originally unclassified but had gained its number by 1932.
The road starts at a sharp bend on the B822, with the River Forth just the other side of the hedge, and heads northeast, winding through fields and past farms almost as much as the meandering river alongside. Slowly, the two diverge, without either contemplating straightening up, and the B8031 crosses the Goodie Water on the old stone arch of the Bridge of Goodie.
Across the bridge, the road turns sharp right, and does, eventually, become straighter, although still with some sharp turns. The Coldoch Estate is passed, hidden away in the trees to the right, and then one final straight brings the road to its end at a T-junction with the A873, less than a mile west of the A84 at Blair Dummond.