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

1. (1) Old U.S. Highway 16 through Rockerville between its two junctions with present U.S. Highway 16 westbound, forty miles per hour;
2. (2) State Trunk Highway 44, beginning at the intersection of Cambell Street, then 3.6 miles southeast, forty-five miles per hour; then east 0.52 mile, fifty-five miles per hour;
3. (3) U.S. Highway 16A beginning at the junction with U.S. Highway 16, then southerly for 0.43 mile, thirty-five miles per hour; then southerly for 1.69 miles, forty-five miles per hour; then southerly for 0.35 mile, thirty-five miles per hour; then southerly for 0.86 mile, twenty-five miles per hour, except from June first to August thirty-first of each year from Swanzey Street to Winter Street, twenty miles per hour; then south and east for 0.58 mile, thirty-five miles per hour; then southeasterly to the Pennington-Custer county line, including that portion of U.S. Highway 16A which loops back into Pennington County for 0.8 mile, twenty-five miles per hour;
4. (4) State Trunk Highway 240 beginning at the junction with Interstate Highway 90 in Wall, then south for 0.3 mile, thirty-five miles per hour; then south for 6.67 miles, fifty-five miles per hour;
5. (5) State Highway Maintenance Route 231 beginning at the intersection of West Chicago Street with Sturgis Road, then easterly for one thousand two hundred feet, thirty-five miles per hour; then easterly for four thousand seventy feet, fifty miles per hour; then easterly to the intersection of Mountain View Road, forty miles per hour;
6. (6) U.S. Highway 16 beginning at the intersection of Mt. Rushmore Road and Omaha Street, then southerly to the intersection of Mt. Rushmore Road and Kansas City Street, twenty-five miles per hour; then southerly to the intersection of Mt. Rushmore Road and Columbus Street, thirty miles per hour; then southerly to the intersection of Cathedral Drive, thirty-five miles per hour;
7. (7) State Trunk Highway 44 beginning at the intersection of Omaha Street and Mountain View Road, then easterly to the intersection of Omaha Street and Twelfth Street, forty miles per hour; then easterly to the intersection of Omaha Street and LaCrosse Street, thirty-five miles per hour; then easterly to the intersection of Omaha Street and Cambell Street, forty miles per hour;
8. (8) State Trunk Highway 87 beginning at the junction with U.S. Highway 385, then south to the boundary line of Pennington County, thirty-five miles per hour;
9. (9) State Highway Maintenance Route 231 beginning at the Pennington-Meade county line, then southeast for 3.08 miles, fifty miles per hour; then southeast for 0.62 mile, forty-five miles per hour; then southeast for 0.35 mile to the intersection with Chicago Street, thirty-five miles per hour;
10. (10) U.S. Highway 16 B beginning at the intersection of U.S. Highway 16 south of Rapid City, then northeasterly for 0.53 mile to mileage reference marker 64.72, forty-five miles per hour; then northeasterly for 5.08 miles to mileage reference marker 69.80, sixty miles per hour; then north for 2.93 miles to mileage reference marker 72.73, fifty-five miles per hour; then north for 0.47 miles to Interstate Highway 90, forty-five miles per hour;
11. (11) The crossroad over Interstate Highway 90 at interstate mileage reference marker 64.16 beginning at the junction of the service road on the north side of the interstate highway and extending 0.2 mile south, thirty-five miles per hour;
12. (12) U.S. Highway 385 beginning at the intersection of U.S. Highway 16 at Three Forks, then north for 16.85 miles to the Lawrence County Line, fifty-five miles per hour;
13. (13) U.S. Highway 16 and U.S. Highway 385 beginning 3.7 miles south of the junction with State Trunk Highway 244, at the Custer County line, then northerly for 3.25 miles, sixty miles per hour; then northerly to a point 0.35 mile north of the junction with State Trunk Highway 244, forty-five miles per hour; then northerly for 2.42 miles, fifty-five miles per hour;
14. (14) State Trunk Highway 244 beginning at the junction with U.S. Highway 16 and 385, then easterly for 0.65 mile, forty miles per hour; then easterly for 4.74 miles, fifty miles per hour; then easterly for 2 miles to the west entrance of the Mt. Rushmore Memorial, forty miles per hour; then easterly for 0.57 mile, thirty-five miles per hour; then easterly for 1.09 miles, twenty-five miles per hour; then easterly for 1.34 miles to the junction with U.S. Highway 16A, thirty-five miles per hour;
15. (15) Highway 16 service road beginning at the crossover approximately two hundred feet south of the Pine Lawn Memorial Cemetery south of Rapid City, then south for 2.1 miles to the end of the service road, thirty-five miles per hour;
16. (16) U.S. Highway 16 beginning 5.72 miles east of the U.S. Highway 385 junction of Three Forks, then westerly for 5.28 miles, fifty-five miles per hour; then westerly for 1.54 miles through the Three Forks junction, forty-five miles per hour; then westerly for 1.62 miles, fifty miles per hour;
17. (17) State Trunk Highway 44 beginning at the junction with U.S. Highway 385, then easterly for 4.26 miles, fifty miles per hour; then easterly for 0.54 miles, forty miles per hour; then easterly for 7.72 miles, fifty miles per hour; then easterly for 0.95 miles, forty-five miles per hour; then easterly for 0.47 miles, forty miles per hour; then easterly for 3.1 miles to the intersection of Mountain View Road and Omaha Street in Rapid City, thirty-five miles per hour;
18. (18) State Trunk Highway 40 beginning at its junction with U.S. Highway 16A in Keystone then easterly 1.38 miles, twenty-five miles per hour; then easterly for 7.76 miles to the south boundary of Pennington County, fifty-five miles per hour;
19. (19) Interstate Highway 90 crossover road at Exit 78 (NewUnderwoodRoad) beginning 0.07 mile south of the centerline of Interstate Highway 90, then north 0.16 mile, forty-five miles per hour;
20. (20) The crossroad over Interstate Highway 90 at Exit 84 (PenningtonCountyRoad497) beginning 0.09 mile south of the centerline of Interstate Highway 90, then north 0.19 mile, twenty-five miles per hour;
21. (21) The crossroad over Interstate Highway 90 at Exit 88 (PenningtonCountyRoad473) beginning 0.11 mile south of the centerline of Interstate Highway 90, then north 0.25 mile, twenty-five miles per hour;
22. (22) The crossroad over Interstate Highway 90 at Exit 107 (PenningtonCountyRoad506) beginning 0.19 mile south of the centerline of Interstate Highway 90, then north 0.38 mile, thirty-five miles per hour;
23. (23) State Trunk Highway 79 beginning five hundred feet south of the junction of Minnesota Street in Rapid City then south to the junction of State Trunk Highway 16B, fifty-five miles per hour; then south on State Highway 79 for 1.29 miles, fifty-five miles per hour; then south to the Custer County line, seventy miles per hour;
24. (24) U.S. Highway 16 beginning at mileage reference marker 40.3 at the south edge of Hill City, then northeasterly for 0.20 mile to the south junction of U.S. Highway 16 Truck Route, thirty-five miles per hour; then northerly for 0.55 mile to the north junction of U.S. Highway 16 Truck Route, twenty-five miles per hour; then northeasterly for 0.53 mile, thirty-five miles per hour; then northeasterly for 0.44 mile, forty-five miles per hour; and on U.S. Highway 16 Truck Route from the south junction with U.S. Highway 16 northerly 0.6 mile to the north junction with U.S. Highway 16, thirty-five miles per hour;
25. (25) U.S. Highway 16 eastbound lanes beginning at Cathedral Drive, then southerly 0.3 mile, thirty-five miles per hour; then southerly for 1.35 miles, fifty miles per hour; then southerly for 4.47 miles, sixty miles per hour;
26. (26) U.S. Highway 16 westbound lanes beginning at Cathedral Drive, then southerly for 1.65 miles, fifty miles per hour; then southerly for 4.47 miles, sixty miles per hour;
27. (27) State Highway 445 (DeadwoodAvenue) beginning at the terminals of the westbound ramps of Interstate Highway 90 at Exit 55, then southeast for 2.3 miles to the junction with West Chicago Street, forty-five miles per hour; and
28. (28) The crossroad over Interstate Highway 90 at interstate mileage reference marker 59.19 (LaCrosseStreet) beginning 0.1 mile south of the intersection with the eastbound ramps, then north to 0.1 mile north of the intersection with the westbound ramps, twenty-five miles per hour.

Source: SL 1975, ch 16, § 1; 1 SDR 29, effective October 6, 1974; 1 SDR 48, effective January 1, 1975; 2 SDR 29, effective October 16, 1975; 3 SDR 75, effective May 1, 1977; 4 SDR 60, effective March 26, 1978; 6 SDR 5, effective July 30, 1979; 6 SDR 85, effective February 24, 1980; 6 SDR 109, effective May 29, 1980; 7 SDR 89, effective March 30, 1981; 9 SDR 35, effective September 19, 1982; 9 SDR 76, effective December 23, 1982; 9 SDR 111, effective February 27, 1983; 9 SDR 132, effective April 24, 1983; 10 SDR 7, effective July 31, 1983; 11 SDR 62, effective November 4, 1984; 11 SDR 112, effective February 25, 1985; 11 SDR 156, effective May 26, 1985; 12 SDR 138, effective February 23, 1986; 12 SDR 174, effective May 5, 1986; 13 SDR 52, effective November 6, 1986; 13 SDR 129, 13 SDR 134, effective July 1, 1987; 14 SDR 111, effective February 28, 1988; 16 SDR 88, effective November 12, 1989; 16 SDR 102, effective December 20, 1989; 16 SDR 152, effective March 28, 1990; 17 SDR 34, effective September 9, 1990; 17 SDR 62, effective November 5, 1990; 17 SDR 82, effective December 20, 1990; 17 SDR 127, effective March 3, 1991; 17 SDR 151, effective April 8, 1991; 18 SDR 78, effective November 4, 1991; 22 SDR 165, effective June 2, 1996; 22 SDR 183, effective June 30, 1996; 24 SDR 132, effective April 5, 1998; 25 SDR 108, effective March 1, 1999; 27 SDR 15, effective August 30, 2000; 30 SDR 89, effective December 7, 2003; 32 SDR 183, effective May 10, 2006; 33 SDR 125, effective January 29, 2007; 34 SDR 279, effective May 8, 2008; 40 SDR 58, effective October 9, 2013 ; 44 SDR 17, effective August 8, 2017 ; 44 SDR 95, effective December 5, 2017; 44 SDR 184, effective June 25, 2018; 46 SDR 26, effective September 2, 2019 ; 49 SDR 47, effective November 21, 2022; 51 SDR 12, effective August 12, 2024 .

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

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

Prior versions effective: 2022-11-21, 2019-09-02, 2018-06-25, 2017-12-05, 2017-08-08, 2013-10-09.