Six feet of warm water: why Dinner Key hulls foul so fast
The Grove basin is shallow. Plenty of slips at Dinner Key give you six to eight feet at mean low water, and some of the inside fingers give you less than that. Two things follow from that. First, the water column heats through — by August the whole depth is warm, not just the top two feet, so barnacle spat and algae are active from the waterline all the way down to the keel shoe. Second, sunlight reaches the bottom of the hull. On a boat in a deep, dark marina basin, the green growth stops a foot or two under the boot stripe. At Dinner Key we routinely find green film and hair algae on the underside of a flat bottom and on the bottom of the keel, because photosynthesis doesn’t stop at four feet in this basin.
Add the nutrient load that runs into this corner of Biscayne Bay after the summer rains and you get growth that is soft, fast and thick. A boat that sat eight weeks in July comes up with a slime layer you can wipe with a gloved hand — but under it, on the leading edges of the rudder, the strut and the trim tabs, there are already hard barnacles with a base you have to work off with a scraper.
Grove muck: visibility, tide, and how we plan the dive
The bottom at Dinner Key is soft marl and silt with seagrass in patches outside the docks. One fin stroke near the bottom and visibility in your slip goes from two or three feet to nothing. That changes how the work gets done. We start at the bow on the windward side, stay off the bottom, and work aft in overlapping passes so the cloud we make drifts behind us instead of into the next panel. Most of the job is done by feel and by pattern — you know where you are on the hull by the chine, the seam, the through-hulls — and the last thing we do is come off the boat and wait a few minutes before shooting the after photos, so you get pictures you can actually read.
Tide matters here in a way it doesn’t in a deeper marina. The bay range in the Grove is only about two feet, but two feet is a lot when a full-keel sailboat draws five and the slip holds six and a half. On the shallow slips we schedule around a rising or high tide so there’s room to get under the keel and actually clean the bottom of it rather than just the sides. Tell us your draft when you book and we’ll pick the window.
The spots that get missed on Grove boats
Raw-water intakes are the big one. A/C and generator intake grates at Dinner Key clog with barnacle spat and grass faster than anything else on the boat, and the first symptom an owner notices is the air conditioning going to high-pressure fault on a hot afternoon at the dock. We clear the grates and the strainer scoops on every clean. The others: folding and feathering props on the sailboats, where growth in the blade hinge keeps the blades from opening; the gap behind a keel-hung rudder; speed and depth transducers, which go dead quiet under a quarter inch of slime; and the underside of swim platforms, which almost nobody looks at until it’s furry.
We also report what we see. Boats in the Grove run the marked channel out past Grove Key and a fair number have kissed the shoal at some point, so bare spots and paint rubbed off the keel bottom and rudder heel are common. If your ablative is chalking out and the barrier coat is showing, you’ll hear it from us before the next clean, not after.
If your boat lives on a mooring ball
The Dinner Key mooring field holds a lot of cruising sailboats that sit for months between trips, and those hulls foul harder than the ones in the slips — no prop wash, no movement, and plenty of current-borne food. We clean boats at a dock or a slip — a transient slip works — so if yours lives on a ball, bring it in to one and we’ll quote it and get it on the schedule.
Pricing for the boats that actually live here
Most of Dinner Key is 25- to 45-foot sailboats and mid-size cruisers, which puts nearly everybody at $4 per foot: $136 for a 34-foot sloop, $160 for a 40-foot trawler. Boats 60 feet and up are $5 per foot. You pay after the work is done, once you’ve seen the before-and-after photos on your phone. Zincs, props and running gear get quoted on site — we’ll show you the photo of a wasted shaft anode before we suggest replacing it. If you keep the boat at the nearby docks instead — Grove Key, Monty’s, the Sailing Club, Shake-A-Leg — same rates, same schedule.
Send us your slip number, boat length and draft on WhatsApp at (786) 756-0304, or call (305) 978-1440. We’ll give you a tide-appropriate window and you don’t need to be at the boat.