The Missouri River's edge hosts this county-managed dispersed camping area, accessible via dirt roads that branch off from the main route into Chamberlain. Campers spread across the open river flats, with multiple informal sites offering direct water access along Arikara Creek and the Missouri River. The area accommodates both tent campers and larger RVs, though road conditions vary significantly with weather.
Most visitors find themselves alone or sharing the space with just a few other groups. Mark Z. notes there's "room for dozens and dozens of campers but I only saw one other overnighter." The spacing between sites creates privacy despite the open terrain, with campers able to position themselves along different sections of the waterfront. Houses sit across the field, so the area isn't completely isolated from civilization.
Road conditions present the primary challenge here. Multiple reviewers warn about muddy, rutted access roads after rain, with some areas becoming impassable for heavier vehicles. The dirt paths leading to riverside spots can trap unwary drivers in wet conditions. Cell service works well for Verizon users, and the area allows campfires, pets, and alcohol. Restroom facilities are available on-site.
Wildlife activity runs high, particularly bird species along the water. The proximity to I-90 means some highway noise depending on wind direction, though most campers report the area remains relatively quiet. Wind can intensify overnight, especially in exposed riverside locations. Camping is limited to seven nights maximum, and the area serves as a convenient overnight stop for travelers seeking camping destinations around Chamberlain without fees or reservations.
The combination of free access, water proximity, and minimal crowds draws repeat visitors despite the access challenges.
Map & DirectionsOacoma Flatts is located in South Dakota near Chamberlain
Coordinates
43.79243347 N
99.39501297 W
Connectivity
- T-Mobile5GExcellent CoverageVerified by 14 usersLast on 5/17/26
- VerizonLTEGood CoverageVerified by 38 usersLast on 5/17/26
- AT&T5GExcellent CoverageVerified by 12 usersLast on 5/17/26
Connectivity
- T-Mobile5GExcellent CoverageVerified by 14 usersLast on 5/17/26
- VerizonLTEGood CoverageVerified by 38 usersLast on 5/17/26
- AT&T5GExcellent CoverageVerified by 12 usersLast on 5/17/26
Access
- Drive-InPark next to your site
- Walk-InPark in a lot, walk to your site.
Site Types
- Dispersed
Features
For Campers
- ADA Access
- Phone Service
- Toilets
- Alcohol
- Pets
- Fires
For Vehicles
- Pull-Through Sites
- Big Rig Friendly
DISPERSED CAMPING
Enjoy dispersed camping on government land and leave no trace. Pack in and pack out. No (or limited) services at this camping area. Permit may be required.
PERMIT might be REQUIRED
We curate permit requirements across the US for our PRO members. Try PRO to see if Oacoma Flatts needs a permit.
Drive Time
- 1 hr 55 min from Sioux Falls, SD
- 2 hrs 40 min from Rapid City, SD
- 2 hrs 57 min from Sioux City, IA
- 3 hrs 54 min from Grand Island, NE












































