It serves the Westville neighborhood of New Haven and the southern portions of the towns of Woodbridge and Ansonia.

Fountain Street continues west, going under the Wilbur Cross Parkway (does not have an interchange with it) into the town of Woodbridge.

Route 313 (Rimmon Road) begins near the country club, heading directly for the town of Seymour.

About 1.6 miles (2.6 km) later, it intersects with Route 114 (Racebrook Road), which leads to Orange (south) and Woodbridge center (north).

The old turnpike connected New Haven and Seymour via modern Route 313 and Fountain Street.