| Clarks Fork Creek | |
| Name Other: | Tributary to South Fork Grand River |
| Pushpin Map: | South Dakota#USA |
| Pushpin Map Caption: | Location of Clarks Fork Creek mouth |
| Subdivision Type1: | Country |
| Subdivision Name1: | United States |
| Subdivision Type2: | State |
| Subdivision Name2: | South Dakota |
| Subdivision Type3: | Counties |
| Subdivision Name3: | Harding |
| Length: | 27.74miles[1] |
| Discharge1 Location: | South Fork Grand River |
| Discharge1 Avg: | 17.04cuft/s at mouth with South Fork Grand River[2] |
| Source1: | North Fork Moreau River divide |
| Source1 Location: | about 12 miles south-southwest of Buffalo, South Dakota |
| Source1 Coordinates: | 45.4103°N -103.6088°W[3] |
| Source1 Elevation: | 3210feet |
| Mouth: | South Fork Grand River |
| Mouth Location: | about 10 miles east-northeast of Buffalo, South Dakota |
| Mouth Coordinates: | 45.6167°N -103.3435°W |
| Mouth Elevation: | 2720feet |
| Progression: | South Fork Grand River → Grand River → Missouri River → Mississippi River → Gulf of Mexico |
| River System: | Grand River |
| Tributaries Left: | Buffalo Creek |
| Tributaries Right: | Slim Buttes Creek Sioux Creek |
| Bridges: | unnamed road (x2), US 85, JB Road, SD 20 |
Clarks Fork Creek, also called Clarks Fork or Sand Creek, is a stream in Harding County, South Dakota, United States. It is a tributary of Grand River.
Clarks Fork Creek was named after Dorr Clark, a local rancher who established the headquarters of a cattle outfit about one mile northeast of the mouth of the stream.[4]
According to the Geographic Names Information System, it has also been known historically as:[3]