Write Up:

Missourians have repeatedly told MoDOT that keeping roads smooth is a top priority. Over the years, MoDOT has been able to fund pavement improvement projects on thousands of state highway miles.

MoDOT maintains 33,814 miles of highway. For year-end 2025, the percentage of major highways in good condition is 89.8%, just below the target of 90% but nearly a full percent increase from 2024. The percentage of minor highways in good condition increased by more than 3% in 2025 compared to 2024, exceeding the target of 80%. 
The percentage of low-volume highways in good condition also continued to improve in 2025, increasing to 85.5%, well above the 70% target for low-volume highways.

As defined by the Federal Highway Administration, the target is based on the statewide asset management plan and represents MoDOT’s goal of maintaining the current conditions of Missouri's highways.

MoDOT has implemented asset management practices statewide to invest in transportation projects that will keep good roads in good condition. Investments made in state highways continue to show results, with the percentage of highways in good condition improving across all three categories in 2025. With numerous interstate improvement projects in progress or planned across the state, major highways should continue to improve beyond the target. MoDOT continues to explore innovative ways to improve the quality of asphalt and concrete used to pave and maintain Missouri’s highways.

Purpose of the Measure:

This measure tracks the condition of Missouri’s highways.

Measurement and Data Collection:

Missouri’s major highway system contains the state’s busiest highways, including interstates and most U.S. routes. There are 5,560 total miles on the major highway system.

Missouri’s minor highway system consists of its less-traveled state highways, including most lettered routes and routes that mainly serve local transportation needs. There are 17,903 miles of minor highways in Missouri.

Missouri’s low volume highways are those state-owned roads with less than 400 cars traveling on them per day. There are 10,351 miles of low volume roads in Missouri.

Missouri measures the condition of its roadways using smoothness as one factor but also considers physical distresses, such as cracking. The targets for this measure are set by internal policy and will not change unless policy changes, regardless of performance.