Commissioned in 1932, Route 177's original location was Route 372 (former Route 72 in Plainville to US 44. It was extended south to Route 10 in Southington in 1963.

In 1965, development plans for the Unionville section of Farmington called for widening the South Main Street portion of Route 177 to four lanes.

In the mid-1990s, ConnDOT and Plainville officials discussed improvements to Route 177, including a possible widening to four lanes at Route 72. Residents near the route opposed this, saying Route 177 would be turned into a speedway.

Route 177 may appear to be a minor route, but it connects several primary east-west routes (72, 6, 4, and 44) and carries significant traffic in Plainville. Widening may still be in the road's future.

• "State Has No Plans To Replace Bridge." Hartford Courant, June 5, 1965.
• "State planning work on Plainville road." Hartford Courant, Oct. 6, 1994.
• "Plainville official objects to proposal." Hartford Courant, Nov. 12, 1994.

• Route 177 Ends (Photos; Doug Kerr at state-ends.com)