South Dakota alternate route U.S. Highway 14A (
US 14A) is an
alternate route for US 14 between
Spearfish and
Sturgis, South Dakota, located mostly south of the
I-90/US 14 overlap. The route begins at the I-90/US 14/
US 85 overlap at exit 14 which serves 27th Street. It briefly runs south and then turns west along East Colorado Boulevard (
I-90 Bus.), which is used as a
frontage road along the south side of I-90. In between US 14A and I-90 is the Spearfish Recreational Trail. I-90 Bus./US 14A moves away from I-90 just before the
intersection with Sandstone Hills Drive. At Spearfish Canyon Highway, US 14A leaves the overlap with I-90 Bus. and turns south. A spur of the Spearfish Recreational Trail leave US 14A at Winterville Road, and, in the vicinity of the southern trailhead of the Spearfish Path, the route begins to wind around Spearfish Creek and
Spearfish Canyon running through the North Hills of
Black Hills National Forest, which includes scenic areas for both cars and hikers, and unincorporated communities and ghost towns such as
Maurice, Victoria, and Elmore. In
Cheyenne Crossing, the road turns left and begins the first of two overlaps with US 85. The two routes form a concurrency from there to
Lead, then are separated where it continues north also overlapping
US 85 Truck, only to turn east as the routes run through Center City and
Backtail. The route meets US 85 again in
Deadwood. The routes run together through Deadwood before splitting again, and US 14A turns east along Boulder Canyon Highway. US 14A ends in Sturgis at the I-90/US 14 interchange at exit 30, but the road continues as another
I-90 Bus. with an overlap of
South Dakota Highway 34 (SD 34) and
SD 79.
Rapid City business loop Pierre truck route U.S. Highway 14 Truck (
US 14 Truck) is a truck route of US 14 in
Pierre, South Dakota. Trucks and overheight vehicles use the truck route to avoid colliding with a low-clearance railroad overpass. The truck route begins at Pierre Street and travels eastward along Sioux Avenue. At , the truck route turns northeastward and crosses the same railroad but at a railroad crossing. The route then runs along Wells Avenue for over before turning north along Garfield Avenue. It then continues northward for around before meeting US 14/US 83.
Huron business loop U.S. Highway 14 Business (
US 14 Bus.) is an unmarked
business loop of US 14 in
Huron, South Dakota. The business route begins at the intersection with West Park Avenue running south in an overlap to Old Highway 14, then turns left onto Old Highway 14 running in close proximity of the south side of the
Rapid City, Pierre and Eastern Railroad (RCPE)'s
Pierre Subdivision. At Lincoln Avenue, Old Highway 14 becomes Market Street Southwest and passes by the northern edge of the
South Dakota State Fairgrounds. East of Livestock Avenue, the road curves around a railroad junction with a former
Great Northern Railway line (now the Yale Spur Subdivision) but still rejoins the same trajectory of the railroad line, albeit further away. Market Street Southwest becomes Market Street Southeast at the intersection with
SD 37. Once it passes by the
Chicago and North Western Roundhouse, the Pierre Subdivision becomes the
Huron Subdivision. Market Street Southeast ends at Frank Avenue Southeast and the route runs for one block south until the intersection with Third Street Southeast then turns east once again. East of Lawnridge Avenue, the road enters Riverside Park where it crosses a bridge over the
James River. Immediately after the bridge, the route leaves Third Street and turns north at Riverside Avenue, passing under the Huron Subdivision which uses the former
Chicago and North Western Transportation Company bridge over the James River. Riverside Avenue runs along the east side of the river but then begins to pull away from it before the road ends at a flyover
interchange with eastbound US 14 and westbound US 14.
Brookings bypass route U.S. Highway 14 Bypass (
US 14 Byp.) is a
bypass route of US 14 along the northern edge of
Brookings, South Dakota. The bypass route begins at a partial interchange with US 14 and travels eastward in a somewhat straight line. After meeting and passing
I-29, the route begins to curve south before ending at US 14. == Minnesota ==