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

1. (1) State Trunk Highway 34 beginning at the west limits of St. Onge Township, then southeasterly for 0.4 mile, forty miles per hour;
2. (2) U.S. Highway 14A beginning at the junction with East Colorado Boulevard in Spearfish, then southerly for 18.5 miles to the junction with U.S. Highway 85 at Cheyenne Crossing, thirty-five miles per hour;
3. (3) U.S. Highway 14A beginning at the junction with U.S. Highway 85 at the north edge of Deadwood, then easterly for 0.1 mile, thirty-five miles per hour; then easterly for 0.5 mile, fifty miles per hour; then easterly for 5.8 miles, fifty-five miles per hour; then easterly for 2.1 miles to the Lawrence-Meade county line, forty-five miles per hour;
4. (4) U.S. Highway 85 beginning at the junction with U.S. Highway 14A near the north city limits of Deadwood, then northerly for 1.2 mile, forty-five miles per hour; then northerly for 2.7 miles, fifty-five miles per hour;
5. (5) State Trunk Highway 34 beginning 0.4 mile north of the centerline of Interstate Highway 90 at Exit 23, then southerly for 0.1 mile, forty-five miles per hour; then southerly for 0.3 mile, thirty miles per hour;
6. (6) U.S. Highway 14A beginning at the junction of U.S. Highway 85 at Cheyenne Crossing, then northeast for 0.2 mile, forty-five miles per hour; then 4.1 miles, fifty-five miles per hour; then northeast for 2.9 miles, forty miles per hour; then northeast for 0.5 mile to the junction of U.S. Highway 85 in Lead, twenty-five miles per hour;
7. (7) U.S. Highway 85 beginning at the west city limits of Lead, then east for 0.8 mile, twenty-five miles per hour; then easterly for 0.5 mile, twenty miles per hour; then easterly for 0.8 mile, twenty-five miles per hour; then easterly to the junction with U.S. Highway 385, thirty-five miles per hour;
8. (8) U.S. Highway 385 beginning at the junction with U.S. Highway 85 in Deadwood, then southeasterly one mile, thirty-five miles per hour; then southeasterly 3.82 miles, fifty-five miles per hour; then southeasterly two miles, forty-five miles per hour; then southeasterly 12.9 miles to the Lawrence-Pennington county line, fifty-five miles per hour;
9. (9) U.S. Highway 85 beginning at the junction of U.S. Highway 385 in the City of Deadwood, then northeasterly for 1.1 miles, twenty-five miles per hour; then northeasterly for 0.7 mile to the intersection of U.S. Highway 14A, twenty miles per hour;
10. (10) U.S. Highway 85 beginning at the Wyoming state line, then northeasterly for 6.9 miles, fifty-five miles per hour; then northeasterly for 9.1 miles, fifty miles per hour; then northeasterly for 0.2 mile to the junction with U.S. Highway 14A at Cheyenne Crossing, forty-five miles per hour;
11. (11) U.S. Highway 14A beginning at the junction with U.S. Highway 85 in Lead, then north for 0.3 mile, twenty-five miles per hour; then northeasterly for 0.3 mile, thirty-five miles per hour; then northeasterly for 3.1 miles, forty-five miles per hour; then northeasterly for 0.7 mile to the junction of Main Street, twenty-five miles per hour; then northeasterly for 0.8 mile to the junction of U.S. Highway 85 at the north edge of Deadwood, thirty-five miles per hour;
12. (12) Truck speed for northbound trucks with dual tires on the driver axle on U.S. Highway 385 beginning at a point 3.5 miles south of the junction with U.S. Highway 85 in Pluma, then north for a distance of 2.5 miles, twenty-five miles per hour;
13. (13) U.S. Highway 14A beginning at the junction of East Colorado Boulevard in Spearfish, then east for 1.6 miles to the south ramp terminals of Interstate 90 at Exit 14, forty-five miles per hour;
14. (14) Northbound U.S. Highway 85 beginning at the south end of the bridge over Interstate 90 at Exit 10, then north for 0.5 mile, forty-five miles per hour; and southbound U.S. Highway 85 beginning 0.5 mile north of the south end of the bridge over Interstate 90 at Exit 10, then south for 0.5 mile, forty-five miles per hour;
15. (15) State Highway Maintenance Route 473 beginning at the junction of U.S. Highway 14A and U.S. Highway 85 southwest of Lead, then westerly for 1.6 miles, forty miles per hour; then westerly for 1.6 miles, thirty miles per hour.

Source: SL 1975, ch 16, § 1; 6 SDR 85, effective February 24, 1980; 9 SDR 7, effective July 27, 1982; 11 SDR 22, effective August 12, 1984; portion of subdivision (3) transferred to subdivision 70:01:02:49 (10), 13 SDR 129, 13 SDR 134, effective July 1, 1987; 14 SDR 111, effective February 28, 1988; 15 SDR 158, effective April 26, 1989; 17 SDR 127, effective March 3, 1991; 17 SDR 151, effective April 8, 1991; 19 SDR 30, effective August 30, 1992; 21 SDR 97, effective November 27, 1994; 21 SDR 171, effective April 2, 1995; 22 SDR 165, effective June 2, 1996; 22 SDR 183, effective June 30, 1996 ; 23 SDR 132, effective February 27, 1997; 26 SDR 124, effective April 2, 2000; 31 SDR 62, effective November 7, 2004; 34 SDR 279, effective May 8, 2008; 37 SDR 58, effective September 27, 2010; 44 SDR 95, effective December 5, 2017; 44 SDR 184, effective June 25, 2018 ; 45 SDR 9, effective July 30, 2018; 52 SDR 41, effective October 27, 2025 .

General Authority: SDCL 32-25-7 .

Law Implemented: SDCL 32-25-7 .

Prior versions effective: 2018-07-30, 2018-06-25, 2017-12-05, 2010-09-27.