| Official Name: | Running Water, South Dakota |
| Settlement Type: | Census-designated place |
| Pushpin Map: | South Dakota |
| Pushpin Label: | Running Water |
| Subdivision Type: | Country |
| Subdivision Name: | United States |
| Subdivision Type1: | State |
| Subdivision Name1: | South Dakota |
| Subdivision Type2: | County |
| Subdivision Name2: | Bon Homme |
| Unit Pref: | Imperial |
| Area Footnotes: | [1] |
| Area Total Km2: | 5.42 |
| Area Land Km2: | 5.42 |
| Area Water Km2: | 0.00 |
| Area Total Sq Mi: | 2.09 |
| Area Land Sq Mi: | 2.09 |
| Area Water Sq Mi: | 0.00 |
| Population As Of: | 2020 |
| Population Footnotes: | [2] |
| Population Total: | 47 |
| Population Density Km2: | 8.68 |
| Population Density Sq Mi: | 22.48 |
| Timezone: | Central (CST) |
| Utc Offset: | -6 |
| Timezone Dst: | CDT |
| Utc Offset Dst: | -5 |
| Coordinates: | 42.7822°N -97.9817°W |
| Elevation Ft: | 1417 |
| Area Code: | 605 |
| Blank Name: | FIPS code |
| Blank Info: | 46-56820[3] |
| Blank1 Name: | GNIS feature ID |
| Blank1 Info: | 2612514 |
Running Water is a census-designated place (CDP) in Bon Homme County, South Dakota, United States. The population was 47 at the 2020 census.[4]
The community's name Running Water is a former variant name of the nearby Niobrara River.[5]
Running Water is located on the north side of the Missouri River in southern Bon Homme County along the South Dakota-Nebraska state line. South Dakota Highway 37 crosses the Missouri at Running Water, becoming Nebraska Highway 14 on the opposite shore. SD 37 leads north and east to Springfield, and NE 14 leads south and west 3miles to Niobrara.
According to the United States Census Bureau, the Running Water CDP has a total area of 5.4km2, all of it land.[6]
Running Water is located along the upper portion of Lewis and Clark Lake, a Missouri River reservoir. The South Dakota Department of Game, Fish and Parks operates a small recreational area for lake and river access including a boat ramp at Running Water.
Running Water is famous for having a ferry boat operating during spring-fall, off and on, from 1874 to 1984. This boat would haul people and vehicles across the Missouri River, between Running Water SD and Niobrara NE. The fare at one time was $1 per vehicle. The need for such a service was reduced or eliminated by the construction of the modern Chief Standing Bear Bridge over the river for SD Highway 37 and NE Highway 14.