Location: SD-79 and US-16 Truck, Pennington Cty Reassurance shield after the 16 Truck split as we head out of Rapid City. Location: SD-79 and Spring Creek Rd, Pennington Cty Reassurance shield several miles south as we cross Spring Creek. South Dakota 79 is South Dakota’s portion of the Heartland Expressway, and has been four-laned nearly … Continue reading South Dakota Highway 79, US-16 Truck to SD-40