Drop-Off Ledge is a freshwater reef site in Lake Oahe, offering an accessible shore entry for beginners. The site features a ledge extending from the shallows to a depth of 9 metres. Conditions are generally manageable with mild currents, though visibility is variable. Divers should be aware of boat traffic in the area and are advised to use a surface marker buoy throughout the dive. On-site facilities include parking, showers, toilets, a cafe, and a dive shop. Before entering the water, check with the local dive shop for a current conditions report to ensure a safe experience.

Boulder Haven is a freshwater site in Lake Oahe offering depths ranging from surface level to 8 metres. This shore entry location is suitable for beginners, featuring a mild current that keeps conditions manageable. The underwater topography consists of rock formations, which require caution during entry and exit due to sharp edges. Divers should wear protective footwear to avoid injury from these rocks. Visibility at the site is variable, so local conditions should be checked prior to arrival. Due to the presence of boat traffic in the area, it is recommended to tow a surface marker buoy at all times while in the water.

Spring Creek in Lake Oahe offers a freshwater diving experience characterised by a transition from a sandy beach entry to rocky drop-offs. The site is suitable for beginners and provides shore access. Divers should be aware that water temperatures in early spring are extremely cold, ranging from 0.5 to 4 degrees Celsius, which presents a risk of hypothermia. Additional hazards include rip currents. On-site facilities include parking, toilets, showers, changing rooms, and a cafe. While the site is accessible for snorkelling, divers and snorkellers must exercise caution due to the cold water conditions.

Sully Flats in Lake Oahe features the submerged remains of the 19th-century Fort Sully. Snorkelers can explore the foundations and various artifacts of the old fort, which now serve as an artificial reef structure. The site is suited for intermediate snorkelers, with visibility typically ranging from 5 to 15 metres. Access is available from both shore and boat. Water temperatures are very cold, ranging from 0 to 4°C, necessitating appropriate thermal protection for all in-water activities. Due to the cold water and variable visibility, participants should exercise caution while exploring the historic site.

Billy Goats Jump is a shallow freshwater wreck site in Lake Oahe, serving as an artificial reef. The site reaches a maximum depth of 10 metres, providing a suitable environment for beginners to practice buoyancy control around a structure. Access is exclusively by boat, and divers should be prepared to bring all necessary equipment, including a surface marker buoy and dive flag. Visibility at the site is variable, so checking local conditions with a boat operator before departure is recommended. Exercise caution when navigating the wreck to avoid contact with the structure, and be aware that the mild current can fluctuate.

Oahe Dam features an artificial reef structure located in Lake Oahe, providing a freshwater diving and snorkelling experience. The site reaches depths of up to 9 metres with visibility ranging from 2 to 6 metres. Divers and snorkellers should be prepared for moderate currents that can surge near the dam structure. Due to the potential for cold water, entanglement hazards, and variable visibility, this site is suited for intermediate skill levels. Both shore and boat entries are available. On-site facilities include parking, toilets, and showers. Divers should plan for upstream entries and maintain a conservative turnaround point to manage the current and navigation.

Oahe Tailrace is a drift dive and snorkel site located immediately below the Oahe Dam. This freshwater environment offers a river-style experience characterised by moderate currents and visibility ranging from 2 to 6 metres. Depths at the site reach up to 20 metres. Divers and snorkellers can access the water via shore or boat. Due to the presence of moderate currents, boat traffic, and potential for cold water, this site is suited for intermediate divers. Facilities available at the location include parking, toilets, showers, rinse stations, air fills, equipment rental, boat charters, and guided tours.

Tailrace is a freshwater drift dive located below Oahe Dam in the Missouri River system. Divers navigate an artificial reef structure at depths ranging from 1 to 20 metres. The site features a moderate current that requires careful planning around dam release cycles. Visibility is variable, typically between 2 and 6 metres, necessitating close proximity to the structure. Entry and exit can be challenging due to a shore break and surf conditions. Given the cold water temperatures and current strength, this site is suited for intermediate divers. Facilities available on-site include a dive shop, boat charter, parking, toilets, and showers.