Spirit Lake to Hill City: A Great Plains Road Trip Guide

Beginning in the Iowa Great Lakes region, this 380-mile westward route traverses the Missouri River and the Great Plains before climbing into the Black Hills of South Dakota. US-18 and I-90 form the backbone of the journey, passing through Sioux Falls and the cornfields of eastern South Dakota.

The drive typically takes 6 to 7 hours without stops, but the real value lies in the natural and cultural landmarks along the way. From the glacial lakes of Iowa to the granite spires of the Black Hills, this trip offers a cross-section of Midwestern and Western landscapes.

Before you go, remember to check road conditions, as winter storms can affect I-90 between exits 330 and 350. For more inspiration on finding unique stops, see how to find the best stops and hidden gems between cities.

The route crosses the Missouri River in Chamberlain, where the Lewis & Clark Interpretive Center offers exhibits on the expedition and the river's history. From there, the landscape transforms from farmland to the Badlands, with its unique banded rock formations shaped by erosion.

As you approach Rapid City, the silhouette of the Black Hills appears in the distance. Hill City, a former mining town, now thrives as a gateway to Mount Rushmore and Custer State Park.

Local commerce along the way includes truck stops and diners, which are hubs for regional cuisine. The Wall Drug in Wall, SD, a classic roadside attraction, offers saltwater taffy, donuts, and a variety of souvenirs. In Hill City, shops sell Black Hills gold jewellery and locally crafted pottery.

For broader travel tips, refer to the guide on how to find the best stops and hidden gems between cities.

Fuel costs for this trip average $45 to $60 for a mid-size sedan, based on regular unleaded at $3.50 per gallon and a 25 mpg vehicle. Gas stations are plentiful in Sioux Falls but sparse between Chamberlain and Wall, so plan accordingly.

The route includes an 80-mile stretch on I-90 with limited services between exits 250 and 330. Rest areas are available at mile markers 230 (westbound) and 298 (eastbound), both equipped with restrooms and picnic tables.

• I-90 is a four-lane divided highway with a 75 mph speed limit.
• US-18 is a two-lane road in Iowa with moderate traffic and a 55 mph limit.
• Winter tires are recommended from November to March.

This route is generally safe, but strong crosswinds on I-90 can affect high-profile vehicles like RVs and trailers. Keep a safe distance from trucks and reduce speed in wind advisories, which are common in spring.

For families, the Children's Museum of South Dakota in Brookings (near the route's midpoint) offers interactive exhibits, and the Reptile Gardens in Rapid City is a rain-or-shine attraction that appeals to kids. Both are open year-round, with peak hours in summer.

Pets are welcome at most rest areas, but require a leash and disposal bags. Wallace State Park in Kansas (slightly off-route) has pet-friendly trails, though it's a detour. In terms of fatigue, rest zones are strategically placed: at Mitchell (exit 330), Chamberlain (exit 265), and Wall (exit 109). Drivers should plan a break every two hours or 150 miles.

Hidden gems include the Corn Palace's marquee in Mitchell, a giant field art installation, and the Badlands' dinosaur fossils at the Ben Reifel Visitor Center.