South Dakota has a lake with more shoreline than all of California

It’s the Missouri River’s best-kept secret

You could drive from Pierre, South Dakota, almost to Bismarck, North Dakota, and never leave the same lake.

Lake Oahe runs 231 miles along the Missouri River, covers 370,000 acres, and drops 205 feet at its deepest point. That makes it the fourth-largest reservoir in the country by volume.

About 1.5 million people show up each year, but with 2,250 miles of shoreline, longer than the entire California coast, the crowds spread so thin you barely notice them.

Fifty-one recreation areas line the shore, and what you can do at each one goes well beyond just fishing.

President Kennedy dedicated this dam in 1962

The U.S. Army Corps of Engineers broke ground on the Oahe Dam in 1948, and it took 14 years before President John F. Kennedy stood at the site on Aug. 17, 1962, to dedicate it.

That same year, the dam started generating electricity. The name comes from the Oahe Indian Mission, founded among the Lakota Sioux in 1874.

The Cheyenne River Indian Reservation and Standing Rock Sioux Reservation border much of the western shore, and the Missouri River corridor holds deep cultural meaning for the tribes who have lived here for generations.

Walleye over 10 pounds come out of here regularly

If you fish walleye, you already know about Lake Oahe.

Anglers drive hundreds and sometimes thousands of miles to cast a line here, and the lake has hosted major national tournaments to prove the reputation is earned.

Fish over 10 pounds show up regularly, and some push close to 15. The South Dakota state walleye record has fallen here in recent years.

Beyond walleye, you can hook northern pike, smallmouth bass, channel catfish and white bass across the reservoir’s long reach.

Chinook salmon swimming in the middle of South Dakota

Lake Oahe is the only spot in all of South Dakota where you can catch Chinook salmon.

The fish can’t reproduce on their own in the reservoir, so a breeding program at Whitlock Bay Spawning Station near Mobridge keeps the population going.

Eggs travel to McNenny State Fish Hatchery in Spearfish for incubation, then the young salmon return to Whitlock Bay for imprinting.

They find the deep, cold water behind the dam and live three to seven years before coming back to spawn. Late summer brings the big fish into shallower water, and that’s when the dedicated salmon anglers show up.

Miles of sandy beach at Okobojo Point

Okobojo Point Recreation Area gives you something you don’t expect in the middle of the Great Plains: miles of sandy beach along the Missouri River.

You can swim, lay out on the sand, or set up a game on the beach volleyball courts near the water.

The lake’s wide, open stretches work well for water skiing, jet skiing and sailing, while kayakers and canoeists can slip into the quiet coves and inlets that line the shore.

Boat ramps at multiple recreation areas get you on the water fast.

200 campsites sitting right on the water

Oahe Downstream Recreation Area near Fort Pierre spreads across three campgrounds with more than 200 sites.

You can pull in a full-service RV with electrical hookups or pitch a tent along the shoreline, where some spots sit close enough to the water that you hear it all night.

Light pollution barely exists out here, so on a clear night you get full views of constellations and the occasional shooting star.

If sleeping on the ground isn’t your thing, modern cabins come with heat, air conditioning and running water.

Bald eagles perch 50 feet from the riverbank

Winter at Oahe Downstream Recreation Area puts you within arm’s reach of bald eagles.

They roost in the tall cottonwood trees below the dam and perch as close as 50 feet from the riverbank, so you don’t need binoculars to see them.

The water below the dam stays open year-round, even when the rest of the lake freezes, and that gives the eagles a steady food source all winter.

White-tailed deer, mule deer, pronghorn, pheasants and waterfowl fill out the area, and Okobojo Point sits on South Dakota’s Great Lakes Birding Trail.

17 native plants draw butterflies to the garden

Right near the main entrance of Oahe Downstream Recreation Area, an interactive prairie butterfly garden sits waiting for you.

The U.S. Fish and Wildlife Service built it as an outdoor education project, and it holds 17 species of native prairie plants that pull in butterflies common to South Dakota.

You can learn to identify the local species and find out how pollinators keep the prairie running.

Every year the park puts on a butterfly festival with garden tours, a children’s parade and family activities that draw visitors of all ages.

116,000 acres of open grassland south of Fort Pierre

Fort Pierre National Grassland rolls out about 116,000 acres of gentle hills and wide flats south of town. Deer, pronghorn, prairie dogs, prairie chickens and dozens of bird species move through the grass.

You can hike, ride horseback, or take a slow drive along the gravel roads that cut through the land. In spring and summer, wildflowers fill the prairie in every direction.

Hundreds of small earthen dams scattered across the grassland create ponds that hold waterfowl and give you another shot at fishing.

Ice fishing for trophy northern pike in January

When Lake Oahe freezes over, the whole scene changes.

From about January through early March, the ice turns into one of the top walleye fishing spots in the country, especially near Mobridge on the upper lake.

Hundreds of thousands of walleye gather in the upper reservoir through winter, and anglers also pull trophy northern pike in the 15- to 25-pound range each season. The best part is the space.

On many days out on the ice, you’ll see few other anglers anywhere near you.

Pick up a key and step inside an 1877 chapel

The Oahe Chapel went up in 1877 as part of the mission that served the Lakota Sioux community. Reverend Thomas L. Riggs and local Native Americans built it together.

When the dam’s construction threatened to put it underwater, crews moved the entire chapel in 1964 to a spot four miles north of Pierre overlooking Lake Oahe.

The interior has been restored to look much the way it did in 1907, with nearly all original furnishings still inside. You can pick up a key at the nearby visitor center and walk through on your own.

Explore Lake Oahe in South Dakota

You can reach the southern end of Lake Oahe from Pierre, South Dakota’s state capital and the main gateway to the reservoir. Mobridge sits on the eastern shore and serves as the hub for the central and upper lake.

The Oahe Dam Visitor Center, located about eight miles north of Pierre on Highway 1804, is open Monday through Friday, with hours running 9 a.m. to 5 p.m. in summer and 10 a.m. to 4 p.m. in winter. Admission is free.

The U.S. Army Corps of Engineers manages all 51 recreation areas around the lake, and a South Dakota park entrance pass runs $8 per day or $36 per year.

This article was created with AI assistance and human editing.

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