Indian Washtub
Location: Jackson County, Florida, United States
Indian Washtub is a small cave system located in the pond floor near Twin Cave. Though modest in overall length, the system features two distinct openings and requires technical entry procedures due to a significant restriction immediately inside the primary entrance.
The explored and mapped portion of the cave currently measures approximately 450 feet of passage.
Geological Context
Structure & Layout
Hydrological Characteristics
Exploration History
Cave Data
Current Status
Geological Context
The system lies within the karst limestone underlying Merritt’s Mill Pond. Two openings are present: an upstream opening and a downstream opening.
The upstream opening provides diver access to the mapped passage. The downstream opening is considerably smaller and does not allow diver penetration. Its orientation and position suggest the possibility of hydrological connection to the nearby Hole in the Wall system, although no confirmed physical connection has been established.
Flow characteristics in the area are subtle compared to the major spring systems of the pond.
Structure & Layout
Entry into the explored portion of Indian Washtub is made through the upstream opening. Immediately inside, a significant restriction requires removal of one sidemount cylinder and pushing it ahead to gain access.
Beyond the restriction, the cave continues into a vertical fissure approximately sixty feet tall. At the bottom of the fissure, the cave opens into a modest passage. The passage remains relatively small in scale, with limited expansion areas.
The downstream opening is too small for diver entry but may represent a secondary vent or potential hydrological linkage.
Hydrological Characteristics
Flow within Indian Washtub is moderate relative to other pond systems. Because the entrance restriction narrows the passage significantly, current may concentrate at the opening depending on pond conditions. Interior flow remains manageable once beyond the initial restriction.
Exploration History
Indian Washtub was explored in the late 2000s by Marius Frei, who extended line approximately 250 feet from the opening.
In 2015, additional exploration identified a continuation passage beyond the previously known terminus. This discovery nearly doubled the mapped length of the cave to its current documented extent of approximately 450 feet.
These efforts clarified the layout of the upstream branch and confirmed the limited accessibility of the downstream opening.
Portions of this cave system were explored and surveyed during cave dives conducted by Rob Neto while documenting Florida’s underwater cave systems for the book The Hidden Rivers of Florida.
Cave Data
Location: Jackson County, Florida
Water Source: Floridan Aquifer
Cave Type: Submerged limestone cave system
Depth Range: 15–60 feet (4.5–18 meters)
Water Temperature: ~68°F (20°C)
Geology: Karst limestone
Primary Access: Spring vent
Exploration Status: Fully explored
Current Status
Indian Washtub remains a compact but structurally distinct cave system within Merritt’s Mill Pond.
Its defining features include:
- Pond-floor dual openings
- Sidemount-only upstream entrance
- Approximately 450 feet of surveyed passage
- Potential but unconfirmed hydrological proximity to nearby systems
Though modest in length, Indian Washtub contributes to the density and diversity of cave development beneath Merritt’s Mill Pond.
Related Systems
Hole in the Wall Cave System
Twin Cave
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