Route 157 is a state highway in central Connecticut from northwestern Durham, through Middlefield to Middletown.

It heads northeast for about a mile into the town of Middlefield, becoming Redds gap Road and passing by Lyman Orchards.

It then turns left onto and begins a 0.7-mile (1.1 km) overlap with Route 147 (Main Street) heading north.

After leaving the overlap, it continues northeast into Middlefield center following the Coginchaug River.

The road continues through the village of Rockfall before entering the city of Middletown.