It is the primary road running through Anza but mostly serves rural areas.

It travels northeast away from the community of Aguanga, loosely paralleling Tule Creek for the first few miles.

[5] Route 277 from Temecula to Anza was added to the state highway system in 1959.

Except where prefixed with a letter, postmiles were measured on the road as it was in 1964, based on the alignment of State Route 71 as it existed at that time, and do not necessarily reflect current mileage.

[1] Segments that remain unconstructed or have been relinquished to local control may be omitted.