The project area extends northerly from the roundabout in Waterbury for approximately 9.5 miles to just beyond the VT 100/Cliff Street intersection in Stowe.
The Vermont Agency of Transportation (VTrans) is rehabilitating VT 100 in the Towns of Waterbury and Stowe to provide a sustainable roadway structure, improve travel surface and reduce the yearly maintenance costs of this important arterial roadway and major tourist route.
The existing surface to the top of the concrete slab varies from 6.5 to 23 inches, with the average depth being 10 inches. This lack of uniformity in the structural layer illustrates the current state of disrepair which generally translates into very poor surface conditions and maintenance challenges. The project consists of removing the existing asphalt and concrete subsurface to construct a new subbase and improve surface conditions.
During the 2018 construction season, the project removed the existing asphalt pavement to the full width of the roadway down to the surface of the concrete slab. The slabs were then removed and a new subbase was constructed. Route 100, side road and private drive aprons were then paved with two lifts of new asphalt before construction activities ended for the winter.
Shoulders were increased to a consistent five foot width, where feasible, to accommodate bicyclists. A number of drainage culverts were repaired or replaced and new subsurface drainage was installed in strategic locations. These drainage improvements will greatly increase the longevity of the roadway by reducing the amount of groundwater infiltrating the roadbed.
The majority of drainage, ditching, shoulder and guardrail work was completed in 2018.
The crews will be returning in Spring 2019 to complete the final lift of asphalt along the entire project length. Other work includes final paving on private drive aprons, completing clean-up and permanent stabilization. The project will install centerline rumble striping, a sidewalk in Stowe and a new traffic signal at Guptil Road.
The project will be constructed primarily during nighttime hours, from 7PM to 6AM, limiting impacts to traffic in the area. It is anticipated that some construction activities may occur during the daytime hours.
Kubricky Construction Corporation
The feasibility of a roundabout was preliminarily evaluated, however, due to the restrictions based on the scope of the Route 100 Project, it was determined that a roundabout would not be possible. Roundabouts tend to require work outside of the State's Right of Way due to their size and necessary construction footprint, and this scope of project restricted work to fall within the existing Right of Way. Further, through a benefit-cost analysis, it was determined that a signal returned a better benefit to cost ratio, as they tend to be significantly cheaper to construct while still providing a large amount of capacity and safety benefits.
The scope of this project is a State Highway Rehabilitation. This scope limits work to fall within the existing State Right of Way, and does not allow for the addition of a large amount of impervious surface as would be required to install an additional lane in either direction. This project looked to address the most prominent need of the road, which was the poor condition of the surface due to the road structure.