Airport Road Pedestrian Underpass Longmont, Colorado

Adding to an existing trail system, the Airport Road Pedestrian Underpass provides safe crossing beneath eastbound SH 119, as well an at-grade crossing on the roadway’s westbound lanes. The design by Otak was completed while accounting for high traffic volumes, working in close coordination with the Colorado Department of Transportation (CDOT), and includes a number of solutions aimed at optimizing the trail user experience.

Innovative Structural Solutions for a Safer Trail Experience

While adding approximately 4,000 linear feet of trail, the Airport Road Pedestrian Underpass incorporates several innovative design solutions to optimize the user experience. A unified drainage system that addressed the high groundwater table and retaining wall system to avoid tight right-of-way (ROW) impacts are among those design solutions. Groundwater mitigation – with consideration of adjacent wetlands – along with cast-in-place aesthetic features are also included. To facilitate two phases of construction, the project included a temporary shoofly roadway in completing utility relocation, lighting, signal modifications, and modifications to existing driveways.