Lake Tenkiller offers a diverse freshwater environment featuring reefs, walls, wrecks, and artificial reef structures. Divers can explore depths ranging from 3 to 50 metres, with an average depth of 15 metres. Visibility typically spans 3 to 11 metres, and currents remain mild, making the site suitable for beginners. Entry is possible from both shore and boat. Water temperatures vary significantly, reaching 32°C at the surface in summer and dropping to -1°C in winter. Divers should exercise caution around rocky sections, as sharp edges pose a hazard to hands and knees. On-site facilities include parking, toilets, showers, changing rooms, air fills, and equipment rental.

Hickory Flats at Lake Tenkiller offers a freshwater underwater landscape defined by gradual sandy slopes and large boulders. These rock formations create small canyons that divers can explore at depths ranging from 3 to 50 metres. Shore entry is standard for this site, which is suitable for beginners. Visibility typically fluctuates between 3 and 11 metres. Divers should be prepared for cold water and low visibility, as well as thermoclines that often develop between 9 and 11 metres during July. Surface temperatures vary significantly by season, ranging from 32°C in summer to -1°C in winter. A typical dive lasts approximately 40 minutes.

Strayhorn Landing at Lake Tenkiller is a protected cove featuring a sandy bottom, making it a suitable location for beginners and families. Divers and snorkellers can expect depths ranging from 1 to 10 metres, with an average depth of 5 metres. Visibility at this freshwater site varies between 3 and 15 metres. Shore access is available, and the site is equipped with parking, toilets, showers, and a rinse station. Typical dives last approximately 40 minutes. The site is well-suited for those looking to practice skills in a shallow, controlled environment.

Mob House is a submerged 1920s outlaw hideout located in Lake Tenkiller. The site features rock walls standing approximately 14 feet high, providing a unique historical structure for divers to explore. Access to this site requires a boat. Depths at the site reach up to 60 metres, and visibility varies significantly between 3 and 25 metres. Divers should be aware of potential entanglement hazards due to the nature of the submerged structure. The lake experiences thermoclines, with surface temperatures reaching the high 80s°F in summer and dropping to the low 40s°F in winter. This site is suited for intermediate divers, with typical dives lasting around 40 minutes.

Buckhorn School is a historical site located in Lake Tenkiller, featuring the submerged remains of a 1930s schoolhouse. The structure walls sit at a depth of approximately 10 metres, with surrounding rock structures and debris scattered across the lake floor. The site is suitable for beginners and accessible via both shore and boat. Visibility varies significantly, ranging from 1 to 15 metres depending on conditions. Divers and snorkellers should remain aware of potential hazards, including boat traffic and entanglement risks. On-site facilities include parking, toilets, showers, air fills, a dive shop, boat charter services, and a cafe.

Goat Island in Pettit Bay offers a freshwater snorkeling experience along a rocky perimeter. Located 500 metres from the shore, the site features depths that vary, with visibility typically ranging between 3 and 15 metres. The area is suitable for beginners and supports both shore and boat entries. Divers and snorkellers may encounter mild currents while exploring the island surroundings. On-site facilities include parking, toilets, showers, changing rooms, a rinse station, air fills, a cafe, a dive shop, boat charters, and guided tours. The island is known for the goats that inhabit the land and frequent the shoreline.

Old DX Landing in Lake Tenkiller offers a unique freshwater experience featuring the submerged remains of the old town of Cookson. Divers and snorkellers can explore foundations and various artifacts left behind after the valley was flooded. The site features a mix of reef and wreck topography, with depths ranging from 8 to 18 metres and an average of 12 metres. Conditions vary, with visibility between 3 and 15 metres and mild currents. A thermocline is present, meaning deeper water is significantly colder than the surface. The site is accessible by both shore and boat, and facilities include parking, toilets, showers, and a dive shop offering air fills and equipment rental.

Sequoyah State Park Main Swim Beach is a freshwater site located on Lake Tenkiller. This beginner-friendly location features a sandy beach entry and depths ranging from 2 to 8 metres, with an average depth of 4 metres. Snorkellers can explore the perimeter of the designated swim area near the wooded shoreline. Conditions include mild currents and visibility typically between 2 and 5 metres. Divers and snorkellers should remain aware of boat traffic and potential entanglement hazards. Facilities at the park include parking, toilets, showers, changing rooms, a cafe, and access to guided tours or boat charters.