Sugarloaf Island Shallows in the Boise Foothills Reservoirs offers freshwater diving and snorkelling characterised by distinct drop-offs. The site provides access to deeper water, making it suitable for intermediate divers. Entry is possible from both shore and boat. Water temperatures in Cascade Reservoir vary significantly, ranging from approximately 36 to 40 degrees Fahrenheit in early April to about 65 degrees Fahrenheit by late June. Current conditions are generally mild. Facilities available at the site include parking, toilets, and showers. The area is well-suited for those interested in exploring transition zones within the reservoir.

Poison Creek Shoreline is a freshwater site located on the western shore of Cascade Reservoir near Tamarack Resort. The underwater topography consists of a mix of sand and gravel. This location is suitable for beginners, offering shore access for snorkelling. Conditions are generally mild, though visitors should be aware of cold water temperatures and potential boat traffic in the area. Facilities available at the site include parking, toilets, and showers. As a beginner-friendly location, it provides a straightforward entry for those looking to explore the reservoir shoreline.

Boulder Creek offers a sandy beach entry into the freshwater environment of Cascade Reservoir. The site features depths ranging from 1 to 8 metres, with an average depth of 4 metres. Conditions are generally mild, though visibility fluctuates between 5 and 15 metres. Water temperatures vary significantly, reaching up to 69.6°F in summer, while early April temperatures remain cold at 39-40°F, requiring specialized thermal protection for any in-water activity. The site is suitable for beginners and provides shore access with nearby parking and toilet facilities. Typical snorkel sessions last approximately 30 minutes. Hazards include cold water, low visibility, and the presence of jellyfish.