Bartoo Island is a freshwater dive site situated mid-lake in Lake Coeur d'Alene. The eastern side, near the Sunrise group site, features underwater rock formations and submerged timber. Access to this site requires a boat, as it is located approximately 9656 metres from the shore. Divers should expect mild currents and depths starting from 1 metre. As a mountain-fed lake, water temperatures are cold, ranging from 4-8°C in April to 16-22°C at the surface during summer. A wetsuit is recommended for comfort and safety. Hazards include cold water and potential entanglement in submerged timber. The site is suitable for intermediate divers and offers good conditions for snorkelling.

Eightmile Island in Lake Coeur d'Alene offers a freshwater snorkel experience centred around historic structures. Snorkelers can explore the shallow waters near the Vinther-Nelson cabin area, where old dock structures provide points of interest. Access to this site requires a boat, as it is located approximately 12,875 metres from the shore. Conditions are generally suitable for intermediate snorkelers, with visibility ranging from 10 to 30 metres and mild currents. Water temperatures are cold, typically reaching 16 to 22 degrees Celsius during the summer months. Divers and snorkelers should remain aware of boat traffic in the area. Facilities available include parking, toilets, showers, a rinse station, and boat charter services.

The Thorofare is a 2.5-mile slow-moving channel connecting the lower and upper lakes of Lake Coeur d'Alene. This artificial reef site features a shallow, sandy bottom with submerged logs that provide habitat for aquatic plants and local fish. Divers and snorkellers can expect depths between 1 and 3 metres, with an average of 2 metres. Visibility is generally good, ranging from 10 to 30 metres. The site is suitable for beginners, though water temperatures can be dangerously cold during spring runoff. Summer surface temperatures typically reach 15 to 21 degrees Celsius. Entry is possible from both shore and boat, and the channel maintains a strict no-wake rule.

Plowboy Campground on Lake Coeur d'Alene offers a freshwater snorkeling experience within a roadless wilderness area. The site features shallow sandy flats with depths ranging from 1 to 8 metres, averaging 3 metres. Visibility is generally high, typically between 15 and 30 metres. The site is suitable for intermediate snorkelers, with both shore and boat entries available. Current conditions are mild, though they can vary. As a freshwater environment, the site provides a distinct setting for underwater exploration in the United States.

The Ruins in Lake Coeur d'Alene features the submerged remains of an early 20th-century lumber mill. This freshwater site offers snorkelers the opportunity to explore structural debris, including old pilings and various machinery parts that now function as an artificial reef. The site is accessed from the shore off the Pend d'Oreille Bay Trail. Depths typically range between 8 and 15 metres, with an average of 10 metres. Divers and snorkelers should be aware of potential entanglement hazards among the submerged structures. A thermocline is often present due to significant temperature differences between the surface and deeper water. The site is best suited for intermediate-level snorkelers.