Two Harbors Isthmus Access provides boat access to over a dozen mooring fields and anchorages across the Two Harbors system on Catalina Island's west end, with 242 moorings at Isthmus Cove alone plus additional options at nearby coves.

Contact Harbor Patrol on VHF Channel 9 upon arrival to request mooring assignments on a first-come, first-serve basis, with shoreboat service available year-round (7 AM-2 AM daily in summer, 8 AM-5 PM in winter).

Essential onshore amenities include restroom facilities, a general store, fuel dock, and access to the Dive & Recreation Center for snorkeling, diving, kayaking, and fishing activities.