Snake River Arm is a freshwater site featuring an underwater forest of submerged standing timber from the original valley floor. Located 1000 metres from shore, this site requires boat access and is suited for advanced snorkelers. Depths range from 3 to 18 metres with visibility varying between 2 and 8 metres. Conditions typically involve mild currents. Due to the presence of submerged timber, snorkelers must exercise caution regarding entanglement and sharp branches. Boat traffic is a known hazard in this area. Facilities available nearby include parking, toilets, showers, equipment rental, and boat charter services. A typical visit lasts 45 minutes.

Powder Horn Arm is an artificial reef site located within the Merritt Reservoir in the United States. This secluded area features a sandy bottom and generally calmer water conditions, though visibility can be limited due to its proximity to the inlet. Snorkellers can explore depths ranging from 2 to 7 metres. Access is available via both shore and boat entries. The site is suited for intermediate snorkellers, though visitors should remain aware of potential hazards including boat traffic, cold water, and entanglement risks. Facilities at the reservoir include parking, toilets, showers, equipment rental, and guided tours. Water temperatures fluctuate significantly throughout the year, ranging from freezing in winter to 29°C in summer.