Pacific Tarn lake is the highest named lake in the United States, situated at an elevation of 13,420 feet. This freshwater site offers a unique high-altitude diving experience with depths ranging from 2 to 8 metres and an average depth of 5 metres. Divers access the water via the shore. Conditions are consistently cold, with summer temperatures between 10 and 15°C and near-freezing temperatures in winter. Visibility varies significantly from 1 to 15 metres. Due to the cold water, depth, and low visibility, this site is suited for intermediate divers. Typical dive times are approximately 18 minutes. Snorkelling is possible but rated 2 out of 5.

Officer's Gulch Pond is a small, deep freshwater site located near Frisco. The pond is sheltered from the wind, which often results in glassy surface conditions and manageable visibility. Divers and snorkellers can explore the submerged logs found throughout the site. Access is via a shore entry, and the location includes parking facilities. Due to the high altitude and freshwater environment, divers should be prepared for cold water conditions. The site is suitable for beginners, with typical dives lasting approximately 30 minutes. Snorkelling is possible, though it is rated 2/5 for this activity.

Turquoise Lake at the Matchless entry offers a high-altitude freshwater dive experience near Leadville. The site features rocky drop-offs that descend from 6 to 30 metres. Divers should be prepared for consistently cold water year-round, with surface temperatures ranging from 2 to 18 degrees Celsius depending on the season. A dry suit is recommended for comfort. Visibility typically fluctuates between 6 and 9 metres. Access is via a shore entry at the boat ramp. Due to the depth, cold water, and potential for boat traffic, this site is best suited for intermediate divers. Snorkelling is also possible at this location.