South Dakota Highway 18
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| Highway 18 (Historic) |
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| Length: | 200 mi (322 km) | ||||||||
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| Existed: | 1926 – 1935 (approx.) | ||||||||
| West end: | Montana border west of Camp Crook | ||||||||
| East end: |  near Mobridge |
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South Dakota Highway 18 was a state route located in northwest and north central South Dakota.
[edit] History
South Dakota 18 was first designated in the mid 1920's, running from the Montana border to near Mobridge. Shortly afterward, U.S. Highway 18 was implemented across the southern portion of the state. The northern highway 18 was redesignated as South Dakota Highway 8 around 1935. It is currently part of South Dakota Highway 20.
