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Colby Reef

Colby Reef

California, United States

Depth
Depth Icon

35m

Visibility
Visibility Icon

9m - 27m

Entry
Boat Entry Icon

Boat

Experience Level

Beginner

Colby Reef

California, United States

Colby Reef
Depth
Depth Icon

35m

Visibility
Visibility Icon

9m - 27m

Entry
Boat Entry Icon

Boat

Experience Level

Beginner

About Colby Reef
This is a beautiful reef starting in shallow water, and then slopes down to deeper waters. This reef has many canyons and caves encrusted in beautiful corals. Much to see and explore.

Colby Reef Dive Info

Terrain & Features

Cave, Reef, Other

Entry Type

Boat

Max Depth

35m

Visibility Range

9m – 27m

Experience Level

Beginner

Best Gas Mix

21% – 31%

O2
CNS Load (20 min)

14% at 33m / 33%

O2
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Marine Life
  • Blacksmiths
  • Garibaldi
  • Ling Cods
  • Rock Fish
  • Scallops
  • Sheepheads
  • Various
Weather Conditions
Water Temperature ℃
Dive Operators near Colby Reef
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Location
Dive Site Hazards

  • Remote Silt Disturbance — Silt can be disturbed metres away from the source.

  • Rapid Stress Escalation — Stress can increase sharply when visibility or navigation degrades.

  • High Cognitive Load Navigation — Complex passages increase mental workload even on a line.

  • Hidden Depth Variations — Complex reef topography can conceal depth changes, leading to unintended profile variations.

  • Distraction from Marine Activity — High fish activity can distract divers and delay depth or gas awareness.

  • Rapid Surge Direction Changes — Surge near reef structures can reverse direction quickly, pushing divers sideways into unexpected areas.

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