Rapid City, South Dakota - Infrastructure

Infrastructure

• Interstate 90 is the primary east-west route for Rapid City. Rapid City is served by a series of 7 exits. I-90 skims the northern side of Rapid City. The South Dakota DOT has been reconstructing most of these interchanges in the last five years.
• Interstate 190 is an Interstate spur linking downtown Rapid City to Interstate 90.
• US Highway 16 is the main route to the southwest and the Black Hills from Rapid City. It links Rapid City to Custer and then west to Newcastle, Wyoming, where it connects to US Highway 85 for travel to Cheyenne and Denver. Reconstructed as a four-lane parkway connecting Rapid City to Mount Rushmore in the mid-1960s, major segments have been rebuilt as three-lane or "super-two" highways in the past decade, to support increased tourist traffic.
• South Dakota Highway 44 is a state highway that links the interior of the Black Hills to the southwest of Rapid City, and the Pine Ridge Indian Reservation and nearby areas in the Great Plains to the southeast.
• South Dakota Highway 79 is a state highway that is multiplexed with I-90 northwest of Rapid City. SD Highway 79 extends to North Dakota. South of Rapid City to Nebraska, Highway 79 is being reconstructed as the Heartland Expressway, a high-speed four-lane highway which will eventually connect to Interstate 80 in Nebraska and the Colorado Front Range near Denver. The Heartland Expressway may eventually be extended along US Highway 85 north to Regina, Saskatchewan, to create an additional major north-south artery through the Great Plains which would pass through Rapid City.

Rapid City's location on the boundary of the Western and Eastern power grids, together with the hydroelectric plants of the Mainstem Dams on the Missouri River and the large coal fields and power plants of the Powder River Basin of Wyoming make it one of the points where the two national power grids connect with each other, allowing switching of electrical power from east to west and vice versa. Rapid City has its own coal-fired power plant, but also obtains much of its power from both the Missouri dams and power stations near Gillette, Wyoming. Electrical rates are considered relatively low.

Rapid City obtains most of its water supply from Rapid Creek and the alluvial aquifers associated with the creek, owning significant water rights in Pactola Reservoir located some 15 miles (24 km) west of the city, but does also obtain water from some springs in the vicinity, and has the ability to draw water from deep formations which receive water from recharge in areas of the Black Hills where the formations come to the surface. The heavy dependence on shallow alluvial aquifers is of some concern to planners, as most suburbs of Rapid City use septic systems for domestic sewage treatment. However, water supplies remain relatively good for future growth.

The Rapid City Regional Airport operates at below maximum capacity for general aviation and commercial aviation, and is capable of handling all current commercial passenger and cargo aircraft.

Rapid City no longer has passenger rail service. Rail cargo service is limited: the Dakota, Minnesota, and Eastern provides connections to other cities in South Dakota and Minnesota, and connects to major rail service along the Mississippi River corridor, but the DM&E also connects to major transcontinental rail lines to the south, in Nebraska and Wyoming.

Rapid City has limited city-to-city bus service along I-90, but many charter bus services operate in the area, and connect Rapid City and Deadwood with cities in Colorado, Nebraska, and Iowa. Rapid City does have a municipally-owned bus service with multiple bus stops and a headquarters in the city.