NBM Dive Site Resource
Mount Waldo Quarry
Frankfort, Maine, United States
A flooded historic granite quarry explored by scuba divers, with submerged quarry machinery and severe cold, darkness and difficult emergency access.
Save this dive site to your free member profile.
Quarry Picture Placeholder
Aquatic life at this dive site
What divers may encounter
Three reviewed connections are featured here. Sightings vary by season, conditions, and chance, so they are never guaranteed.
Aquatic life research in progress
NBM is reviewing a likely local species for this position.
Aquatic life research in progress
NBM is reviewing a likely local species for this position.
Aquatic life research in progress
NBM is reviewing a likely local species for this position.
Site media
Photographs
Three views rotate from the published gallery on each visit.
Contributor media
Dive videos
Three featured video positions are reserved on every profile.Published reference location
Location map
The marker shows the public coordinates associated with this profile. Confirm current access, moorings, and departure details before the dive.Map data © OpenStreetMap contributors
Recent field observations
Diver-reported temperatures
Automatically checked observations from dives during the past 14 days. Three reports are visible at a time; scroll for more.A report that passes the automatic checks will appear here with the dive date, diver’s display name, and temperatures at each depth.
Reports are automatically checked for plausible dates, depths, and temperatures. They are observations, not forecasts; confirm conditions before diving.
Why divers know this place
Highlights
Flooded quarry or mine topography, freshwater ecology and site-specific historic or placed features.
Quarry-only module
Quarry layout and services
This section appears only for quarries and mines, with the practical details divers need for entries, training areas, submerged features, surface support, and current operations.
- Current operating status
- Verify current seasonal hours, road conditions, ice and operator schedule.
- Submerged attractions
- Flooded quarry or mine topography, freshwater ecology and site-specific historic or placed features.
- Onsite dive services
- Facilities vary; confirm with the current operator or land manager and arrive self-sufficient.
- Surface facilities
- Facilities vary; confirm with the current operator or land manager and arrive self-sufficient.
Before you arrive
Access notes
Do not treat public recreation status as managed dive access. Expect a remote carry, cold water, darkness, submerged cables and machinery.
Plan within your training
Conditions and hazards
Cold water, thermoclines, silt, entanglement, submerged machinery or trees, steep walls, extreme depth and limited emergency access.
At the site
Facilities and support
Facilities vary; confirm with the current operator or land manager and arrive self-sufficient.
Independent resource notice
This record is a starting point for independent verification. Access, closures, moorings, weather, currents, depth, visibility, operator availability, and site conditions can change without notice. Confirm current information with the responsible operator, property owner, managing authority, or another qualified local source before planning or attempting a dive.