I-25 is currently a three-lane interstate (each direction) with standard acceleration and deceleration ramps at Fillmore and Garden of the Gods. The goal of this project is to add continuous auxiliary lanes in each direction between Fillmore and Garden of the Gods and to identify a phased implementation plan for the ultimate section, which includes a fourth through lane in each direction.

Basis served as a subconsultant on this project providing roadway design support; construction phasing design and specifications; and drainage design support including hydraulic design, stormwater management plan (SWMP), and grading and erosion control (GEC). Basis also managed the overall specification package and developed project special provisions for roadway, drainage, phasing, and general bid items.