

Best for intermediate divers, 15-30m, boat entry, moderate current.
Halfway Rock is a boat-access site located 1609 metres off Cape Ann, featuring a diverse topography of reef, wall, and pinnacle structures. The site ranges in depth from 15 to 30 metres, with visibility typically between 5 and 15 metres. Divers must be prepared for moderate currents, surge, and cold water temperatures ranging from 4 to 15 degrees Celsius. A thermocline is present, with temperatures below 15 metres often remaining near 10 degrees Celsius. Due to the depth and conditions, this site is suited for intermediate divers. A dry suit or thick wetsuit with hood and gloves is essential year-round to manage heat loss.
42.50247, -70.77498
Time your dive around slack water to manage the moderate current, as it can strengthen quickly against the wall and pinnacle sections. Dry suit or a thick wetsuit with hood and gloves is essential year-round given water temperatures as low as 4 degrees Celsius.
Boat charter required.
Recorded at this site
Depth
15-30m
Visibility
5-15m
Skill Level
Intermediate
Entry
Boat
Boat required
Water Temp
4-15°C
Current
Moderate
Typical Dive
40 min
Best Time
Jun, Jul, Aug, Sep
No, this site is rated for intermediate divers due to the significant depths, moderate currents, and cold water conditions.
The site features depths ranging from 15 to 30 metres.
This is a boat-access site located 1609 metres from shore, requiring a boat charter.
Divers should expect moderate currents, surge, and cold water temperatures between 4 and 15 degrees Celsius. A thermocline exists, with bottom temperatures below 15 metres often hovering around 10 degrees Celsius.
Monitor for strong currents and surge before entry. Manage your ascent carefully and ensure proper thermal protection, such as a dry suit, to prevent rapid heat loss.
Diving at Halfway Rock in Marblehead requires the following certifications: Open Water. Always dive within your training limits.
A drysuit recommended is recommended for diving at Halfway Rock in Marblehead. Water temperatures range from 4°C to 15°C.
The best months to visit Halfway Rock in Marblehead are June, July, August, and September. Conditions outside these months can still be good but are less predictable.