Siletz Reef is a protected marine area located 2400 metres offshore from Neskowin. This site features deep rocky habitats and kelp forests, extending to depths of 50 metres. Access is by boat, and the site is suited for advanced divers due to challenging conditions including strong currents, surge, and surf. Visibility varies between 2 and 12 metres, and water temperatures remain consistently cold, ranging from 8 to 10 degrees Celsius throughout the year. Divers and snorkellers should be prepared for cold water and low visibility environments.

Roads End in Lincoln City, United States, is a reef site defined by basalt rock formations and submerged lava islands. These structures create protected pockets within the marine environment. Divers and snorkellers should be prepared for cool water temperatures ranging from 10C to 13C throughout the year. The site is accessed from the shore, though it is located 1609 metres out. Conditions are variable, with visibility typically between 5 and 15 metres. Due to strong currents, rip currents, surge, and surf, this site is suited for intermediate divers. Hazards include an overhead environment and the presence of sharks. Facilities available include parking, toilets, showers, and equipment rental.

The Neskowin Ghost Forest features the remains of ancient Sitka spruce stumps dating back 2,000 years. These structures emerge from the surf at low tide, creating a unique environment where the barnacle-encrusted trunks act as natural wooden tide pools. Snorkelling is possible at this shore-entry site, which is suitable for beginners. Water temperatures are cold, ranging from 10C to 13C throughout the year. Visitors should be aware of significant hazards including surf and rip currents. Facilities at the site include parking and toilets.

Proposal Rock is a basalt sea stack situated off the Oregon Coast near Neskowin. This site features a natural keyhole arch and rocky shelves that form shallow tide pools. Snorkelling is best during negative low tides when the reef is submerged. Depths typically range from 1 to 3 metres, with an average of 2 metres. Marine life includes very common Ochre Sea Stars, common rock crabs and snails, and occasionally California Sea Lions, Sea Nettles, Pacific Lion's Mane Jellyfish, and Opalescent Inshore Squid. Access is via the shore, though users must navigate cool water temperatures between 10C and 14C, alongside potential hazards such as rip currents, surf, and jellyfish.

NW 15th Street is a localized rocky shelf situated within the sandy coastline of Lincoln City. This site features submerged rocky outcrops that support kelp and various invertebrates. Snorkeling here is best suited for intermediate participants due to the presence of surf, sharp coral, and mild currents. Access is via the shore, and the site is best explored when the ocean is exceptionally flat. Facilities available at the location include parking, toilets, showers, and a rinse station. Typical sessions last approximately 60 minutes, though conditions vary significantly.

Siletz Bay in the United States offers a shallow estuarine environment for snorkelers. The site features a sandy bottom and the submerged base of the Four Brothers rock formations, best explored during high slack tide. Snorkelers can observe various marine life, including very common harbor seals and crabs, such as rock crabs and European green crabs. Other species recorded here include snails, herring, ochre sea stars, and the occasional sea nettle. Entry is via the shore near the Taft waterfront. Conditions are generally mild, though snorkelers should be aware of cold water temperatures, surf, and potential rip currents. Parking is available for visitors.

Gleneden Beach State Recreation Site is a sandy beach environment characterised by a heavy shorebreak. Snorkelling conditions are generally poor due to low visibility and a lack of rocky structure. The site is primarily used by beginners for practising gear handling in the shallows. Water temperatures are consistently cold, ranging between 10C and 14C throughout the year. Hazards include significant surf, rip currents, and cold water temperatures. Swimming is generally not recommended. Facilities at the site include parking and toilets.

Chief Kiwanda Rock is a massive volcanic monolith located approximately 1600 metres offshore from Pacific City. The site features a submerged base that creates a vertical reef environment. Due to its exposed location, this site is strictly for advanced snorkelers and requires boat access, typically via dory boat. Conditions are challenging, characterised by strong currents, surge, and cold water temperatures ranging from 10C to 14C throughout the year. Divers and snorkelers must remain vigilant regarding boat traffic, rip currents, and the potential for entanglement. Wetsuits are essential for all water activities here to mitigate the risk of hypothermia.