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:
April 24, 2026:
As of Thursday, April 23, 2026, two-way traffic has been switched on S.D. Highway 50 to the south half of the roadway in Tyndall. Construction on the north half of the roadway has begun. 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.
An 11-foot width restriction is in place on Highway 50 for the duration of the project.
The overall project completion date is Friday, Nov. 20, 2026.
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April 16, 2026:
Anticipated Work - May 2026:
The contractor will continue removing the existing surfacing as they work toward the east end of the project. They will begin breaking up, crushing and removing the underlying concrete surfacing so grading and drainage pipe work can begin.
April 2026 Completed Work:
The contractor has built the temporary widening on the south side of S.D. Highway 50 to carry two-way traffic so work on the north side of the road can begin. The contractor has started removing the existing asphalt surfacing on the west end of the project.
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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.