Largo Sound: depth, boat ramps and water quality
Boat: 5 ramps and launches on file for this water.
Start here: Launch at John Pennekamp Coral Reef State Park - Boat Ramp, 4 lanes, concrete.
The estuary
Largo Sound covers 921 acres in Florida, across Monroe County. It is an estuary: the deepest point measured is 7.8 feet (2.4 m). Our records hold 8 species for this water.
Depth: down to 7.8 ft at the deepest measured point
Deepest measured point: 7.8 ft (2.4 m). We hold 234 depth contours for this water, drawn from 6,972 soundings.
Water and conditions
Our water temperature readings average 80°F; they do not cover the whole year, so this is not a yearly average. The coldest single reading we hold is 66°F and the warmest is 93°F; the warmest monthly average is 87°F. pH averages 7.9. These readings span 2022–2025.
5 ramps and launches on this water
On this water we hold 2 trailer ramps, 1 boat ramp and 2 hand launches.
- John Pennekamp Coral Reef State Park - Boat Ramp — 4 lanes, marina, concrete, parking for 31 trailers (paved), paid, daylight hours, flush restrooms, dock, restrooms. Key Largo, Florida Department of Environmental Protection. 102601 Overseas Highway, Key Largo 33037 · website floridastateparks.org/parks-and-trails/john-pennekamp-coral-reef-state-park
- Caribbean Club Pay Ramp — 2 lanes, concrete, parking for 18 trailers (paved), paid, portable restrooms, dock, lit for night fishing. Key Largo. 104740 Overseas Highway, Key Largo 33037
- Marina Club Key Largo at Blackwater Sound — Key Largo. 103950 Overseas Highway, Key Largo 33037 · phone +1-305-453-0081 · website marinaclubkeylargo.com
Car-top and kayak launches — no trailer
- John Pennekamp Coral Reef State Park - Kayak Launch at Far Beach — hand launch, gravel, parking for 17 cars, paid, daylight hours, flush restrooms. Key Largo, Florida Department of Environmental Protection. 102601 Overseas Highway, Key Largo 33037 · website floridastateparks.org/parks-and-trails/john-pennekamp-coral-reef-state-park
- John Pennekamp Coral Reef State Park - Kayak Launch at The Point — hand launch, gravel, parking for 8 cars, paid, daylight hours, flush restrooms. Key Largo, Florida Department of Environmental Protection. 102601 Overseas Highway, Key Largo 33037 · website floridastateparks.org/parks-and-trails/john-pennekamp-coral-reef-state-park
3 of the 5 places listed have both a fee and opening hours on file: a blank means we hold no such field, not that it is free or always open, and this list may not be complete.
What is hard here
Only 5 public ramps are on file, so the launch decides where you fish. Summer water sits at 87°F: heat and afternoon lightning are the real risks, not the fishing.
Where this data comes from
- NOAA Digital Coast — NOAA Digital Coast bathymetric lidar: class A, a survey of the bottom.
- USACE eHydro — USACE eHydro channel surveys: class A, a survey of the bottom.
- NOAA BlueTopo: class A, a survey of the bottom.
- NOAA National Bathymetric Source (S-102 ed3.0.0) — NOAA S-102 bathymetric surfaces: contours: class A, a survey of the bottom.
- NOAA ENC — NOAA Electronic Navigational Charts: soundings: class A, a survey of the bottom.
