Crab Dock is a reef and artificial reef site located in the Umpqua River estuary on the Southern Oregon Coast. Divers and snorkellers can explore the pilings and the base of the rocky jetty, situated approximately 75 metres from shore. The site offers both shore and boat access, with entry typically from a small sandy beach west of the public crabbing pier. Depths range from 3 to 18 metres, with an average of 8 metres. Conditions are variable, with visibility reaching up to 15 metres and mild currents. Hazards include boat traffic, entanglement risks, sea urchins, and surf. The site is suitable for intermediate-level divers.

Ziolkouski Beach, located at the mouth of the Umpqua River on the Southern Oregon Coast, features a unique triangular jetty formation. This structure creates a calm, saltwater lake effect, providing a sheltered environment for snorkelling. The rocky rip-rap along the shore serves as a habitat for tide pool life. Entry is from the shore, and the site is suitable for beginners. Conditions include mild currents, though visitors should be aware of potential surf, boat traffic, and cold water temperatures. Water temperatures range from 10C to 14C throughout the year, making a wetsuit necessary for safety and comfort. Facilities at the site include parking, toilets, and showers.

Umpqua South Jetty on the Southern Oregon Coast consists of both natural reef and artificial reef structures. This site is suitable for advanced divers due to strong currents, surf, and potential rip currents. Visibility varies significantly, ranging from 0 to 15 metres, and water temperatures remain consistently cool between 9 and 11C throughout the year. Divers and snorkellers should plan their entry for high slack tide to mitigate the influence of the river current and improve visibility. Parking is available at the site. Typical dives last approximately 45 minutes, with an average depth of 5 metres and a maximum depth of 10 metres.

Eel Lake is a deep freshwater coastal site on the Southern Oregon Coast, offering shore access for snorkelling. The lake features macrophyte beds and underwater logs, which can be explored from the designated swimming area and kayak launch. Depths range from 2 to 20 metres, with an average of 10 metres. Conditions are generally mild, though the site experiences strong thermal stratification, with anoxic conditions occurring below the thermocline. Snorkellers should be aware of hazards including deep water, potential entanglement in vegetation, and the presence of a thermocline. The site is suitable for beginners and provides a range of facilities including parking, showers, and equipment rental.

Tahkenitch Landing is a coastal dune lake featuring complex shorelines and a sandy bottom. Snorkelling is primarily conducted near the landing area, where depths range from 2 to 7 metres with an average of 3 metres. The site is suitable for beginners and offers shore access. Water temperatures fluctuate between 10C and 14C throughout the year. Divers and snorkellers should be aware of potential hazards including entanglement and low visibility. Toilets are available at the site for visitor use.

Siltcoos Lake at the Westlake entry offers a freshwater diving experience characterised by thick lily pad forests and submerged logs. The site features an artificial reef structure, though visibility is frequently limited by dense aquatic vegetation. Divers should be prepared for cold water conditions, with temperatures averaging 11C year-round and thermoclines present. The site is accessed via a shore entry near the Westlake boat ramp. Due to the vegetation density and environmental conditions, this location is suited for intermediate divers. Snorkelling is not recommended here. Facilities available at the site include parking, toilets, showers, changing rooms, a rinse station, air fills, equipment rental, a cafe, first aid, a dive shop, and boat charter services.

Woahink Lake is a freshwater dive site in the United States featuring an artificial reef in shallow water. Depths typically range from 1 to 2 metres, making the site suitable for beginner divers practising buoyancy or navigation skills. Visibility is variable, ranging from 0 to 6 metres. Water temperatures remain between 10 and 13 degrees Celsius throughout the year, requiring appropriate thermal protection. Divers should be aware of boat traffic and potential entanglement hazards near the reef structure. Shore access is supported by comprehensive facilities, including parking, toilets, showers, changing rooms, and a rinse station. Divers are advised to use a surface marker buoy to maintain visibility to boaters.

Woahink Lake, located near Florence, serves as a freshwater alternative for divers when coastal conditions are challenging. This site features artificial structures, including a yellow submarine and several small boats, which are used for navigation practice and training. Divers enter from the shore near the boat ramp off Canary Road. Depths range from 2 to 23 metres, with an average of 10 metres. Conditions include cold water and visibility between 2 and 8 metres. Divers should be aware of potential hazards such as boat traffic, entanglement risks, and low visibility. The site is suitable for beginners and offers a typical dive time of 55 minutes.