In November of 2000, VSL completed construction of the Colorow Reservoir in Denver, Colorado. The structure is 168 feet in diameter and 23 feet high with a capacity of approximately 3.8 million gallons of potable water for residential use. The bottom slab, wall, and roof slab are entirely post-tensioned to maintain compression in the concrete elements under all loading conditions and to provide minimal long-term maintenance of the structure.

Five weeks total were required to place the ten individual full-height wall segments. A unique feature of the structure is the efficient "W" configuration of the wall post-tensioning tendons. Biaxial compression is applied to the wall through the vertical and horizontal curvature of the tendons. An advantage of this configuration is the elimination of stressing pilasters typically required for walls with tendons placed orthogonally. Access for placing the strands, stressing, and grouting was provided from the top slab decking.