S.D. Highway 50 and S.D. Highway 37 - Tyndall
Project Summary:
The project includes approximately three miles of reconstruction on S.D. Highway 50 through Tyndall. Work will begin on the east side of Tyndall at the start of the four-lane divided highway and extend west to just beyond the intersection of S.D. Highway 50 and S.D. Highway 37 South, where the divided highway ends.
The project includes full roadway grading to transition the four-lane divided highway into a five-lane undivided roadway with a center turn lane. Additional work includes new asphalt surfacing, culvert replacement, intersection realignment, roadway lighting and permanent signing to improve safety and traffic flow.
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Project Updates:
March 25, 2026 - Press Release:
On Monday, April 6, 2026, work will begin on the S.D. Highway 50 and S.D. Highway 37 grading project between 417th Avenue and one-half mile west of the Highway 37 south intersection. The project will modify the existing four-lane divided highway sections and realign all intersections throughout the project.
Work on the Highway 50 section will include transitioning the four-lane divided highway through Tyndall into a five-lane undivided highway with a shared left-turn lane. The project will also transition the four-lane divided highway through the Highway 37 south intersection to a two-lane highway with left- and right-turn lanes, along with grading the rural two-lane road between Tyndall and the intersection of Highway 37 south.
Additional work includes the installation of new pipe culverts, a concrete box culvert, curb and gutter, lighting through Tyndall, and asphalt resurfacing.
The westbound lanes will be constructed first while two-way traffic is diverted onto the eastbound lanes. Once the westbound lanes are complete, traffic will be diverted onto this section, and construction on the eastbound lanes will begin. Motorists can expect delays during these times. An 11-foot width restriction will be in place on Highway 50 for the duration of the project.
Work on the Highway 37 south section will include grading for approximately 2,000 feet to realign the intersection with the newly constructed Highway 50.