South Dakota Highway 10 (SD 10) is a state highway in the north-central and northeastern portions of South Dakota, United States. It connects SD 1804 in Pollock with the Minnesota state line southeast of Sisseton. SD 10 was formerly the "Glacier Trail", and used to be designated as South Dakota Highway 12 (SD 12). Route description Campbell County SD 10 begins at an intersection with SD 1804 in the south-central part of Pollock. It travels to the east on Main Street. After leaving the city limits of Pollock, the highway curves to the northeast and crosses over part of Lake Pocasse. It passes the Pocassee National Wildlife Refuge and curves to the east-southeast. It then heads nearly due east to an intersection with U.S. Route 83 (US 83) north of Herreid. The two highways travel concurrently to the south. They pass the Herreid Livestock Market and the Herreid Municipal Airport and then enters the city limits of Herreid. South of the city, they cross over Spring Creek. They travel just to the west of McClarem Lake and then intersect 112th Street. At this intersection, SD 10 splits off to the east. After an intersection with SD 271 (319th Avenue), the highway enters the west-central part of McPherson County. McPherson County SD 10 travels just north of some sewage disposal ponds and just south of Eureka Lake and then has an intersection with SD 47 and the southern terminus of County Road 3 (CR 3; both are parts of 327th Avenue). At this intersection, SD 10 and SD 47 travel concurrently and they enter Eureka. The highways travel just south of an eastern part of Eureka Lake. An intersection with 7th Street leads to the business district of the city. At 328th Avenue, SD 47 splits off to the north, and SD 10 continues to the east. It travels just south of the Rosenthal, Neuharth, Pfeiffle, Morlocks Slough, Odessa Number 2, and Odessa Number 1 state public shooting areas. Then, it has an intersection with SD 45 and the northern terminus of SD 247 (both parts of 341st Avenue). Here, SD 10 and SD 45 travel concurrently to the east. They skirt along the northern edge of the Highway 10 State Public Shooting Area. They travel north of the Moscow State Public Shooting Area and then curve to the southeast. They intersect the southern terminus of SD 239 (350th Avenue). SD