

Best for advanced divers, 33-91m, boat entry, strong current.
Jeffreys Ledge is a deep-water reef located 13 kilometres off Cape Ann, offering technical diving across a significant depth range of 33 to 91 metres. The site is characterised by strong currents and consistent visibility of 30 metres. Due to water temperatures ranging from 3 to 10 degrees Celsius, a drysuit with full thermal protection is essential for all divers. Access is strictly by boat, and the site is suited only for advanced divers due to the depth, potential for entanglement, and rapidly changing current conditions. Divers should coordinate closely with charter operators to time slack water windows accurately, as currents can build quickly.
42.68220, -70.40407
Slack water windows at this site are short and the current can build quickly, so confirm tidal timings with your charter operator on the day rather than relying on tide tables alone. A drysuit with adequate undergarment is essential year-round given water temperatures between 3 and 10 degrees Celsius.
The southern section of Jeffreys Ledge sits in the northern part of the Stellwagen Bank National Marine Sanctuary.
Recorded at this site
Depth
33-91m
Visibility
30m
Skill Level
Advanced
Entry
Boat
Boat required
Water Temp
3-10°C
Current
Strong
No, this site is intended for advanced divers only due to the significant depth range, strong currents, and potential for entanglement.
The site ranges from 33 to 91 metres, with an average depth of 55 metres.
Boat access is required to reach this site, which is located 13,000 metres from shore.
The site experiences strong currents and cold water temperatures between 3 and 10 degrees Celsius, requiring drysuits and careful gas planning.
Divers must manage risks associated with cold water, strong currents, and potential entanglement in deep water.
Diving at Jeffreys Ledge in Rockport requires the following certifications: Advanced. Always dive within your training limits.
A drysuit recommended is recommended for diving at Jeffreys Ledge in Rockport. Water temperatures range from 3°C to 10°C.