Editor's note
We get questions about fixed vs floating docks every week from boat owners researching their first slip or planning their next harbor. This page collects what we actually tell them — the parts of the comparison conversation that change a decision, not the parts that sound good in marketing copy.
Fixed docks are pilings with a fixed deck height; floating docks rise and fall with the water on guide pilings. The right answer depends on tide range, storm exposure, and the boats the marina serves.
Floating docks dominate where tide range exceeds 3 ft (Pacific Northwest, Gulf of Maine, Bay of Fundy). They keep the step-off height constant — critical for liveaboards, older boaters, and accessibility.
Fixed docks dominate inland lakes, low-tide-range Gulf and SE Florida marinas, and rivers without significant tidal flow. They're cheaper to build, last longer, and handle ice better in northern climates.
Storm performance varies. Floating docks ride storm surge better but can fail catastrophically if guide pilings are undersized. Fixed docks are stable but submerge in surge events — boats tied to them can be lost.
Floating dock advantages
- • Constant step-off height
- • Better for big tides
- • Better for liveaboards
- • Rides storm surge
Fixed dock advantages
- • Cheaper
- • Longer lifespan
- • Handles ice better
- • Stable in chop