In the 1938 numbering system, main road 77 ran between Oulu and Kajaani, which initially ran south of the
Oulujoki. In the 1950s, the route was moved to the north of the river. When the route south of the river was improved in the 1970s, it was renamed
Highway 22 and main road 77 was decommissioned. The former main road 77, which ran to the north of the river, was redesignated to regional road 830 and is now access road 8300. The road between Siilinjärvi and Viitasaari was completed in the mid-1970s, and the road was originally numbered as regional road 557. The road between Viitasaari and Kyyjärvi was finally completed in 1986, when the entire section was named main road 77. The road, especially on the 22-kilometer section between
Taimoniemi and
Keitele, has been too narrow, winding, hilly and in poor condition for the traffic volume and road grade. There have been few overtaking opportunities, poor lighting and many dangerous intersections on the section. Road improvement work began in the summer of 2015 and it was completed in the summer of 2017. == Route ==