Dive 1: Drop in and go counter-clockwise around small island northwest of drop in. Keep the island wall to your right the whole time. At beginning of dive, (approximately 8 o'clock) depth is about 70 ft. As you progress around the island wall and reach 12 o'clock the depth rises to 50 ft. Once you reach the channel the depth becomes around 30 ft. If you have good air management you can do a complete lap around the island with one tank depending on how much stopping you do. WARNING: Due the Northern exposure of this dive the water can get unpredictable at times, especially in the channel. Make sure you do this dive on mellow days.
Dive 2: Drop in and go Northwest-west. An advanced dive ensues that starts you out at 70 ft. As you keep traveling in the same direction the dive gets deeper and deeper. At about 100-110 ft it's about time to turn around and head back. This dive is an advanced dive because of the depth, air management, and the navigation skills needed.
Dive 3: Drop in east of the point marked on map you will find a pipeline heading Southwest-west. You can follow the pipe to the end and back getting as deep as 70 ft. A nice dive with a lot to look at.
There are even more dives here in this area but these are my top three that I've found out here so far.
Facts about Mendocino Headlands State Park, California. Drop in point 100 yards west of the arc rock.
It is in United States- The typical depth is 0-30 Metres 0-100 Feet.
- The typical visibility is 3-10 Metres 10-30 Feet.