Boat lift motors and cables in Key Largo

Signs it is time

• Broken strands or rust on the cable
• Cable flattened where it wraps the drum
• Uneven lift between the two sides
• Motor overheating or tripping the breaker
• Grinding or slipping gearbox

Ocean side tide at Rock Harbor

NOAA's Rock Harbor station on the Atlantic side of Key Largo records a 2.09 ft mean range and a 2.37 ft great diurnal range, with mean higher high water about 0.25 ft above NAVD 88 (1983 to 2001 epoch). There is no NOAA datum station on the bay side near Key Largo, so for bay side lots we measure the water on site.

Cables and motors are sized to lift the boat clear of that tide range, and they wear fastest where salt water reaches them.[1]

Class 3 for unincorporated Monroe

Key Largo is unincorporated, so it shares Monroe County's flood insurance rating, and the County lists its current Community Rating System class as 3. Monroe takes part in the program on behalf of homeowners in unincorporated areas, and the discount depends on whether a home is inside the Special Flood Hazard Area.

Motors and switches are mounted above likely flood levels where the lift allows it.[2]

Lift setbacks by type

Monroe County sets side setbacks by lift type: 7.5 ft for elevator lifts, 5 ft for personal watercraft lifts up to 1,500 lb, and 10 ft for a floating lift set along the shore. A four-post cradle lift is allowed only on a lot at least 70 ft wide on a man-made waterway at least 60 ft wide.

Swapping a motor or cables keeps the lift as permitted, which is why repair beats replacement here.[3]

What makes Key Largo different

The special exception application asks owners to describe the submerged lands the dock crosses, such as sand, seagrass or coral, and the minimum extra length needed to reach adequate water depth. The site plan must be prepared by a Florida registered architect, engineer or landscape architect and show the mean high water line and shoreline setbacks.[4]

Sanctuary, seagrass and manatees

Projects inside the Florida Keys National Marine Sanctuary needed prior Sanctuary approval under SPGP VI. The same permit let boat lifts and minor structures in Monroe County go into existing boat slips without a seagrass survey. All in-water work follows the state manatee conditions.[5][6]

Permits in Key Largo

• Monroe County Planning and Environmental Resources Department: Dock length special exceptions under County Code section 118-12(m)(15).
• Florida Keys National Marine Sanctuary: The Sanctuary starts at mean high water, so Key Largo canal and bay work is inside it; SPGP VI required its prior approval.
• Florida DEP or South Florida Water Management District: State permit or exemption, which Monroe County needs to see before it issues a Notice to Proceed for docks, seawalls and ramps.
• US Army Corps of Engineers, Jacksonville District: Federal permit, also required before the County's Notice to Proceed.

Cable care that makes cables last

Inspect cables at least once a season, use penetrating oil rather than grease, lubricate pulleys and gearboxes, and replace worn cables immediately. In salt water, keep the sacrificial anodes fresh.[7]

Frequently asked questions