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.

Diver's Point, located within the Oahe Downstream Recreation Area, serves as a primary shore-access site for divers and snorkellers. The topography consists of a rocky bottom interspersed with submerged structures, including the T-Dike. Depths range from 2 to 10 metres, with an average of 5 metres, making it suitable for beginners. Visibility varies between 5 and 15 metres. Water temperatures fluctuate significantly throughout the year, ranging from near freezing in winter to 27°C in summer. Divers should be aware of hazards including boat traffic, entanglement risks, and cold water, which presents a high risk of hypothermia outside of the summer season.

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.

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.

The Bowl is a freshwater reef site in Lake Oahe, offering a relaxed dive experience suitable for beginners. Divers can explore the reef structure at depths reaching 11 metres. Entry is via the shore, and the site features mild currents. Visibility is variable, ranging from near-zero to 15 metres, so monitoring depth and conditions is essential. Due to the potential for cold water, appropriate thermal protection is recommended. Divers should remain vigilant regarding boat traffic and use a surface marker buoy at all times. On-site facilities include parking and a cafe for convenience.

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 is a shallow, expansive freshwater site located in Lake Oahe. The area features a natural highway created by current breaks, which influences the movement of water across the flats. Depths typically range from 2 to 5 metres, with an average depth of 3 metres. Conditions vary, with visibility ranging from 1 to 5 metres and moderate currents present. Water temperatures fluctuate significantly, reaching up to 28°C at the surface in summer, while deeper sections remain cool throughout the year. Access is available via both shore and boat, with parking facilities provided nearby. This site is suited for intermediate snorkelers.