NE 28th Avenue was a substandard collector street in Hillsboro, OR, that had only two travel lanes and no bicycle lanes, sidewalks, or storm infrastructure. The corridor was the single crossing point of the TriMet Light-Rail line, connecting residential neighborhoods to the south with shopping centers and restaurants to the north. The challenge was to widen the corridor within a developed community, matching the fabric of the neighborhood.
Kittelson provided roadway design, signal design, traffic control plans, storm drainage conveyance and water quality design, landscape design, survey, geotechnical design, Level 1 hazardous materials assessment, and specifications and construction cost estimates. Also, Kittelson prepared a life-cycle cost-benefit analysis to justify the upfront capital expense of a concrete street, furthering the complete street theory.
To aid in public involvement and the right-of-way process, Kittelson created three-dimensional (3D) visualizations (renderings) of the improvements. The visualizations were produced from the design model, which allowed us to convey clearly how public input was incorporated into the design as well as display precise images of the designed project.
Early in the design process, conflicts with Portland General Electric (PGE) and Frontier Communications were identified. Kittelson understood the design needs of PGE and designed the storm and waterline improvements so that the contractor and PGE could work cohesively during road closures. The Frontier Communications conflict required minor changes, including a fiber-optic duct bank to be lowered.
3D Brings an Unbuilt Complete Street Alive
Because Kittelson was committed to utility coordination during the design process, the contractor mobilized and began work unobstructed. Construction was completed on schedule and with no delays from PGE or Frontier Communications.
The NE 28th Avenue improvements created a safe and efficient multimodal complete street from Main Street to Cornell Road through a residential neighborhood into the commercial district. The improvement provides a continuous pedestrian and bicycle route; Americans with Disabilities Act (ADA) access to communities, businesses, and parks; and a full stormwater collection, conveyance, and treatment system.
Kittelson’s work on NE 28th Avenue demonstrates how accessibility, stormwater, roadway and signal design, utility coordination, and access management were successfully implemented within an active community.