Trihydro was awarded a project by the Wyoming Department of Transportation (WYDOT) on behalf of the City of Cheyenne (City) and the Cheyenne Board of Public Utilities (BOPU) to reconstruct 0.61 miles of West Pershing Boulevard, a principal thoroughfare, in Cheyenne, Wyoming. Trihydro’s scope of work included planning and design services, supplemental and boundary surveys, traffic analysis, hydraulic analysis and stormwater drain design, geometric roadway design, right-of-way retracement, water and sanitary sewer design, traffic signal design and control plan, and construction management. The project's purpose was to address drainage concerns; improve the curb, gutter, and sidewalk; and update Pershing Boulevard to address current WYDOT and City design standards for an urban principal arterial.
A key aspect of project success involved stakeholder engagement. Not only was coordinating the requirements of the City, BOPU, and WYDOT challenging, but the public was also an important stakeholder. Trihydro led the public involvement campaign to solicit input from the community and gain acceptance from the corridor stakeholders for the proposed design. To preserve as many mature cottonwood trees as possible along the corridor, Trihydro worked with stakeholders and City staff to design sidewalks and pedestrian features that had a minimal impact on the trees, and were compliant with Americans with Disabilities Act of 1990 (ADA) guidelines.
As part of the project, BOPU elected to upgrade and rehabilitate the existing water and sanitary sewer facilities in West Pershing Boulevard. Trihydro provided surveying, design, and permitting services; construction monitoring; and administration services. This portion of the project included replacement of 3,145 feet of 8-inch waterline with a new 12-inch line and upgrades to the existing waterlines in seven intersections. The vertical alignment of the waterline had to be modified at each of the cross streets as well as multiple points along the Pershing Boulevard alignment to accommodate the new storm sewer system. Several sanitary sewer crossings also required casing, or flowable fill, because the required vertical separation distance from potable water lines could not be achieved.
The project was completed on schedule, under budget (design cost of $636,000 and construction cost of $4 million, and with zero safety incidents.