South Dakota Highway 445 (SD 445), also known as Deadwood Avenue, is a 2.4-mile-long (3.9 km) north–south state highway in Rapid City, South Dakota. Lying in the northwestern corner of the city, it connects Interstate 90 (I-90) with the downtown area.

Route description

SD 445 begins at an intersection with SD 231 (W Chicago Street / W Omaha Street) in Rapid City's Westside, just across Rapid Creek and the Dakota Hogback from downtown. It heads northwest as a four-lane undivided highway to pass through an industrial area. The highway curves more northward, passing the former Lien Airport as it travels through a more commercial district. SD 445 narrows to two-lanes immediately before coming to an end at its interchange with I-90 / US 14 / SD 79 (exit 55); Deadwood Avenue continues north. The entire length of SD 445 lies within the Rapid City city limits.

All of SD 445 is legally defined via South Dakota Codified Law § 31-4-243.

Major intersections

The entire route is in Rapid City, Pennington County.

mi	km	Destinations	Notes
0.00	0.00	SD 231 (W Chicago Street / W Omaha Street) to I-90 BL / SD 44 – Downtown	Southern terminus
2.372	3.817	I-90 / US 14 / SD 79 – Gillette, Sioux Falls	Northern terminus; I-90 exit 55
1.000 mi = 1.609 km; 1.000 km = 0.621 mi