SDDOT to detail Rapid City U.S. 16 interchange project at Aug. 4 meeting

The South Dakota Department of Transportation will hold an informational meeting at 5 p.m. Aug. 4 to discuss its phased U.S. Highway 16/16B/Catron Boulevard interchange construction project in Rapid City.

The meeting concerns planned work along the U.S. Highway 16 corridor, including the Promise Road intersection and the later reconstruction of the U.S. 16 and U.S. 16B intersection. SDDOT’s project information separates the work into phases extending from 2026 through 2030.

Promise Road work scheduled through 2028

The first listed phase, at the Promise Road intersection, is scheduled for 2026 through 2028. According to SDDOT, that work includes grading, asphalt-concrete resurfacing, curb and gutter, storm sewer, lighting, and curb and sidewalk work.

That schedule identifies a construction phase rather than a completed improvement. The available project information does not provide an exact construction start date within the 2026-28 window, a contractor, or a traffic-control plan.

For people traveling through or accessing the corridor, the meeting is an opportunity to hear about a project that will involve roadway, drainage, lighting and pedestrian-related work at Promise Road before the larger intersection reconstruction planned later in the schedule.

U.S. 16 and U.S. 16B reconstruction follows

SDDOT schedules reconstruction of the U.S. 16 and U.S. 16B intersection for 2029 through 2030. The department lists Portland cement concrete surfacing, a single-point urban structure, median crossovers and traffic diversions among the features of that later phase.

Traffic diversions are identified as part of the 2029-30 intersection work, but the available project page does not specify closures, detour routes, timing for individual disruptions, or the number of properties that could be affected. It also does not provide a total project cost or identify funding sources.

What is known next

The Aug. 4 meeting is the next announced public event for the corridor project. SDDOT has not stated on the available project page whether the meeting will result in a revised design or schedule.

The department identifies the project as part of the U.S. Highway 16 corridor in Rapid City, connecting planned work at Promise Road with the subsequent U.S. 16/16B intersection reconstruction. The published timeline means the project should be understood as a multiyear, phased effort, not as work already underway at every listed location.