The following are the maximum speeds on certain highways in Fall River County:

1. (1) U.S. Highway 18 beginning at the junction with U.S. Highway 385 in Hot Springs, then westerly for 0.4 mile, thirty-five miles per hour; then westerly for 0.5 mile, forty-five miles per hour; then westerly for 0.7 mile, fifty miles per hour; then westerly for 0.3 mile to the junction with University Avenue, forty miles per hour;
2. (2) State Trunk Highway 71 beginning at the Nebraska state line, then north for 1.2 miles, fifty-five miles per hour; then northerly for 0.9 mile, forty miles per hour; then northeasterly to 0.4 mile south of the intersection with U.S. Highway 18, fifty-five miles per hour; then northeasterly for 0.4 mile to the intersection of U.S. Highway 18, forty-five miles per hour;
3. (3) State Trunk Highway 471 beginning at its intersection with State Trunk Highway 71, then northwesterly for 13.2 miles, fifty-five miles per hour; then northwesterly for 0.6 mile, thirty-five miles per hour; then northerly for 6.5 miles, fifty-five miles per hour; then northerly for 0.6 mile, thirty-five miles per hour; then northerly to the intersection with U.S. Highway 18, twenty-five miles per hour;
4. (4) U.S. Highway 18 beginning 2.9 miles west of the junction with University Avenue at the west edge of Hot Springs, then east for 2.7 miles, fifty-five miles per hour; then east for 0.2 mile, thirty-five miles per hour;
5. (5) U.S. Highway 18 beginning at the junction with State Trunk Highway 79, then westerly for 1.7 miles, fifty-five miles per hour; then westerly for 2.2 miles, fifty miles per hour; then westerly to the junction with U.S. Highway 385, thirty-five miles per hour;
6. (6) U.S. Highway 385 beginning at the junction with U.S. Highway 18 in Hot Springs, then northerly for 2.1 miles, twenty-five miles per hour; then northerly for 0.5 mile, thirty-five miles per hour; then northerly for 0.2 mile, forty-five miles per hour;
7. (7) U.S. Highway 385 beginning at the Nebraska border, then north to a point 0.7 mile south of the junction with U.S. Highway 18, seventy miles per hour; then north to the junction with U.S. Highway 18, fifty-five miles per hour;
8. (8) U.S. Highway 18 beginning at the junction with U.S. Highway 385 near Oelrichs, then westerly for 0.3 mile, fifty-five miles per hour; then westerly to a point 0.6 mile south of the intersection with State Trunk Highway 79, seventy miles per hour; then north to the junction with State Trunk Highway 79, fifty-five miles per hour;
9. (9) State Trunk Highway 79 beginning at the junction with U.S. Highway 18, then north for 0.6 mile, fifty-five miles per hour; then north to the Custer County line, seventy miles per hour;
10. (10) U.S. Highway 18 beginning 0.7 mile west of the junction with State Trunk Highway 471, then east 0.8 mile, fifty-five miles per hour;
11. (11) U.S. Highway 18P beginning at its west junction with U.S. Highway 18, then easterly to the west junction with State Trunk Highway 471 in Edgemont, twenty-five miles per hour; and
12. (12) U.S. Highway 18P beginning at its east junction with U.S. Highway 18, then westerly for 0.4 mile, forty-five miles per hour, then westerly to the east junction with State Trunk Highway 471 in Edgemont, twenty-five miles per hour.

Source: SL 1975, ch 16, § 1; 6 SDR 5, effective July 30, 1979; 6 SDR 109, effective May 29, 1980; 11 SDR 112, effective February 25, 1985; 12 SDR 7, effective July 28, 1985; 12 SDR 138, effective February 23, 1986; 13 SDR 9, effective August 3, 1986; 13 SDR 129, 13 SDR 134, effective July 1, 1987; 14 SDR 111, effective February 28, 1988; 16 SDR 102, effective December 20, 1989; 22 SDR 165, effective June 2, 1996; 23 SDR 132, effective February 27, 1997; 24 SDR 165, effective May 31, 1998; 25 SDR 108, effective March 1, 1999; 32 SDR 109, effective December 26, 2005; 44 SDR 95, effective December 5, 2017 ; 48 SDR 39, effective October 3, 2021; 50 SDR 42, effective October 11, 2023; 52 SDR 41, effective October 27, 2025 .

General Authority: SDCL 32-25-7 , 32-25-7.1 .

Law Implemented: SDCL 32-25-7 , 32 - 25-7.1 .

Prior versions effective: 2023-10-11, 2021-10-03, 2017-12-05, 2005-12-26.