What was once a constrained and increasingly unreliable corridor north of Madison is now a modern, resilient transportation route that safely serves a growing region. The CTH M Reconstruction Project transformed a critical 2.6-mile segment into a high-performing, multimodal corridor that improves mobility, enhances safety, and respects the surrounding environmental landscape.
CTH M has functioned as a vital east–west connection linking communities, employment centers, and regional destinations for decades. However, rapid population growth and development pushed the existing two-lane roadway beyond its limits. Congestion, unpredictable travel times, and limited accommodations for pedestrians and bicyclists created mounting challenges for daily users. Crash rates climbed to more than twice the statewide average, reinforcing the need for a comprehensive solution.
KL Engineering led the design of a corridor-wide transformation that balances operational efficiency with environmental stewardship. The project expanded key segments to a four-lane divided roadway, reconstructed major intersections, and introduced a continuous off-road multi-use trail that connects neighborhoods to regional recreation systems. Strategic access management and widened medians now support safer traffic movements, while signalized intersections improve both capacity and predictability for all users.
Delivering this project required navigating a highly sensitive environmental setting. The corridor is bordered by protected wetlands, wildlife areas, and parklands, leaving little room for conventional design approaches. The team responded with context-sensitive solutions that minimized impacts while enhancing ecological outcomes. Innovative stormwater strategies replaced traditional systems with natural, passive treatment features that improve water quality and reduce long-term maintenance.
Construction presented equally complex challenges. Extensive marsh excavation, unstable soils, utility coordination, and weather variability required continuous collaboration and adaptive problem-solving. Through disciplined planning and coordination among Dane County, WisDOT, the contractor, and the design team, the project was successfully completed on schedule in May 2025.
The result is more than a roadway improvement. It is a corridor that reflects the needs of a growing community while preserving the character and environmental integrity of the surrounding landscape. Today, CTH M supports safer travel, improved reliability, and expanded recreational access, standing as a model for how thoughtful engineering can deliver lasting value to both people and place.
