It then turns north along Leesville Road as it heads towards the Haddam town line.

After about 0.4 miles (0.64 km), Route 196 splits off to the north (towards East Hampton center), while Route 151 heads west, also crossing into the town of East Hampton about 0.9 miles (1.4 km) later.

In East Hampton, Route 151 continues northwest towards the Connecticut River, bypassing the village of Haddam Neck.

It intersects with the access road to Hurd State Park (unsigned Special Service Road 439) along the way, passing through the village of Middle Haddam then ending at an intersection with Route 66 in the village of Cobalt.

[1] A 1.51-mile (2.43 km) section of Route 151, running from milepost 9.26 to the northern terminus, is designated a scenic road.