South Dakota Highway 1804

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Highway 1804
SD 1804 highlighted in red
Route information
Maintained by SDDOT
Length	126.745 mi[1][2] (203.976 km)
Existed	1975[3]–present
Tourist routes	Lewis and Clark Trail
Central Charles Mix County segment
Length	3.792 mi[1] (6.103 km)
South end	Shore of the Missouri River south of Geddes
North end	SD 50 south of Geddes
Northwest Charles Mix County segment
Length	8.039 mi[1] (12.938 km)
South end	359th Avenue / 282nd Street southwest of Platte
North end	SD 44 / SD 50 southeast of Academy
Pierre–Forest City segment
Length	57.014 mi[2] (91.755 km)
South end	US 14 / US 83 in Pierre
Major intersections	SD 204 near Pierre US 212 southeast of Forest City to east-northeast of Forest City
North end	296th Avenue / 160th Street near Forest City
Glenham–Pollock segment
Length	57.900 mi[2] (93.181 km)
South end	135th Street near Glenham
Major intersections	US 12 / SD 20 east of Mobridge to Mobridge SD 10 in Pollock
North end	ND 1804 at the North Dakota state line northwest of Pollock
Location
Country	United States
State	South Dakota
Counties	Charles Mix, Hughes, Sully, Potter, Walworth, Campbell
Highway system
South Dakota State Trunk Highway System Interstate US State
← SD 514 → SD 1806

South Dakota Highway 1804 (SD 1804) is a 126.745-mile-long (203.976 km) state highway in the U.S. state of South Dakota.

It consists of four disconnected segments. The southernmost segment is in the central part of Charles Mix County. It travels 3.792 miles (6.103 km) from the shore of the Missouri River south of Geddes north to an intersection with SD 50 also south of Geddes. The second segment is in the northwestern part of Charles Mix County. It travels 8.039 miles (12.938 km) from an intersection with 282nd Street southwest of Platte to an intersection with SD 44/SD 50 southeast of Academy. The third segment is in the central part of the state. It travels 57.014 miles (91.755 km) from an intersection with US 14/US 83 in Pierre north to an intersection with 160th Street north-northeast of Forest City. The fourth segment, which is the longest segment, travels 57.900 miles (93.181 km) from a continuation of 135th Street south-southeast of Glenham northward to the North Dakota state line. Here, it intersects 102nd Street and continues as ND 1804.

The segments from Pierre to US 212 and from Mobridge to the North Dakota state line are parts of the Lewis and Clark Trail. The number for SD 1804 and SD 1806 are numbered from the years of the Lewis and Clark Expedition.

The segment from Pierre to the Oahe Dam was previously SD 514 prior to 1975.