100 Foot Rock

Washington, United States

Depth

30m

Visibility

5m - 15m

Entry

Shore

Experience Level

Experienced

100 Foot Rock

Washington, United States

Depth

30m

Visibility

5m - 15m

Entry

Shore

Experience Level

Experienced

About 100 Foot Rock

This dive is a huge rock which was deposited by a glacier. It has a large amount of hiding spots for marine life and is located close to the wharf. This is a deep dive and is recommended for intermediated levels and above.

100 Foot Rock Dive Info

Terrain & Features

Rock, Other, Deep

Entry Type

Shore

Max Depth

30m

Visibility Range

5m – 15m

Experience Level

Experienced

Best Gas Mix

21% – 35%

O₂

CNS Load (25 min)

16% at 28m / 36%

O₂

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Marine Life

Octopus
Rock Fish
Wolf Eel

Weather Conditions

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Dive Operators near 100 Foot Rock

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Location

Dive Site Hazards

Bubble Trapping Under Overhangs — Rock overhangs can trap exhaled bubbles, reducing visibility and causing disorientation.
Reflected Surge Patterns — Surge reflecting off rock faces can create irregular and unpredictable water movement.
Current Funnel Effect — Narrow gaps between rocks can accelerate water flow unexpectedly.

Gradual Narcosis Onset — Narcosis may develop slowly, making self-assessment unreliable.

Task Fixation at Depth — Cognitive narrowing at depth can reduce awareness of time and ascent rate.

Increased Gas Density Breathing Load — Higher gas density at depth increases work of breathing.

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