The first time I took my own boat into the Gironde I got the timing wrong, and the estuary made me pay for it. I crossed the bar off Pointe de Grave an hour after the flood had peaked, lost the lift, and spent the next three hours grinding upstream at four knots over the ground with the log reading seven. It is the largest estuary in western Europe, roughly 75 kilometres of brown tidal water, and it does not forgive a careless tidal plan. Get the timing right and the same passage becomes a free ride: I have since carried the flood from the mouth past Pauillac and watched the GPS show eleven knots over the ground under a tired old engine.
This is a passage you ride, not one you fight. Everything below is built around that single idea.
The mouth: do not treat the bar lightly
The Gironde drains the Garonne and the Dordogne into the Bay of Biscay, and all of that water meets the Atlantic swell over a shifting sandbank. The Grande Passe de l'Ouest is the buoyed deep-water channel and it is the only sensible way in for a visiting yacht. Approach in daylight, with the tide flooding, and with no significant swell running against an ebb. A westerly swell over a spring ebb builds steep breaking seas across the entrance that have wrecked boats far better found than mine.
Pick up the BXA safe-water buoy well offshore and follow the lateral marks in. The channel is well lit and well charted, but the banks either side dry or carry very little water, so stay between the buoys and resist the urge to cut corners. If you are crossing a sandbar for the first time anywhere on this coast, read up on crossing a sandbar safely before you commit, because the principle is the same here as at the Vendee inlets.
Your first refuge is right inside the mouth. Port Medoc, at Le Verdon on the south bank, has around 950 berths with roughly 95 kept for visitors, and you raise the office on VHF channel 9. It is the obvious place to break the trip, sleep, and reset your tidal calculation before pushing on. There is fuel here, a travel-hoist, water and power on the pontoons, and a small town behind for provisions, so it doubles as the place to top up before the long brown miles upstream where services thin out.
One detail that catches visitors: the mouth of the Gironde is a long way out. The deep-water buoyage extends a fair distance offshore, and the streams run hard right out across the bar, so you are committed to the tidal plan well before you can see any shelter. Do not arrive off the entrance hoping to wait around for slack water in comfort, because there is nowhere comfortable to wait. Time your offing so that you reach the BXA buoy with the flood already making.
Reading the tidal gates
The flood runs harder and shorter than the ebb in the Gironde. The downstream ebb occupies roughly two thirds of the cycle and the upstream flood about one third, which means the flood is the stronger stream, especially in the few hours before local high water. That asymmetry is the whole game. You want to be moving upstream during that compressed, powerful flood and tucked into a berth before the long ebb sets in against you.
High water does not arrive everywhere at once. As a working rule, high water at Pauillac falls about one hour after high water at Pointe de Grave, and high water at Bordeaux about two hours after Pointe de Grave. Castets-en-Dorthe, where the canal lateral a la Garonne begins, is roughly four hours behind the mouth. Lay those offsets against a tide table and you can plan to leave the entrance so that the flood carries you the whole way up.
Distances matter for the same reason. It is about 71 kilometres, near enough 38 nautical miles, from the Bec d'Ambes confluence down to the sea, and Bordeaux sits a further stretch up the Garonne. You cannot cover that in one slack-to-slack window at displacement speed. The realistic plan is two flood tides: one to get well up the estuary, a stop, then a second flood up the Garonne into the city.
Where to stop along the way
Pauillac, on the Medoc bank among the great wine chateaux, is the natural halfway halt. The marina holds about 150 resident berths with roughly 10 to 20 kept for visitors, it answers on VHF channel 9, and the maximum draught is around two metres so deep-keeled boats should arrive near high water. It is an all-floating basin, well sheltered, and you can walk into a village that pours some of the most expensive wine on earth at prices that are still merely eye-watering rather than absurd.
Anchoring in the estuary itself is possible but rarely pleasant. The holding is soft mud, the streams are fierce, and the water is so silt-laden that you will not see your anchor again until you weigh it. I have anchored off the islands in settled weather to wait for a tide, never to spend a comfortable night. The estuary is dotted with islands, the largest being the Ile de Patiras with its old lighthouse, and in light conditions tucking behind one of them out of the main stream gives you somewhere to sit out a foul tide. Lay plenty of scope, set an anchor watch, and expect the boat to swing hard as the stream turns.
There is one other thing to budget for: debris. The Gironde carries a great deal of floating timber and weed flushed down by the Garonne and the Dordogne, especially after rain inland. Keep a lookout ahead, particularly at night, and check the engine intake if the water temperature climbs, because a plastic bag or a raft of weed over the inlet is a real risk on this river. A rope cutter on the shaft earns its keep here.
The run up the Garonne to Bordeaux
The final leg from the confluence up to Bordeaux is river sailing: narrower, the current concentrated, the banks closer. Time your departure from Pauillac to pick up the young flood and ride it into the city. The water is the colour of strong tea the whole way, stirred up by the tidal range, and on big springs the Gironde even produces a tidal bore on the upper reaches, the mascaret, which surfers chase but which you want no part of in a yacht.
In Bordeaux the city has installed visitor pontoons along the quays, including the Ponton d'Honneur near the centre, and the Halte Nautique gives you a berth within walking distance of the eighteenth-century waterfront. You moor with the spires and the Place de la Bourse reflected in the river, which is a long way from the average commercial harbour. Berths are limited and the tidal stream past the pontoons is strong, so come alongside slack or stem the stream on arrival.
Note also the bridges. The lower Garonne is crossed by several bridges before the city, and the Pont Jacques Chaban-Delmas in Bordeaux is a vertical-lift bridge that opens to a published schedule rather than on demand. If your air draft needs the lift, you must arrive to suit the opening times, which are tied to tide and to advance notice, so check the current schedule before you commit to the final run up. Get that wrong and you will be holding station in a strong stream waiting for a bridge that is not going to move for hours.
Bordeaux is also the gateway inland. From Castets-en-Dorthe the canal lateral a la Garonne runs south towards Toulouse and the Canal lateral a la Garonne to the Atlantic route, which links into the cross-country passage many cruisers use to reach the Mediterranean without rounding Spain.
Practical notes before you go
Carry an up-to-date chart and the latest pilot, because the entrance buoyage gets moved as the banks shift. Plan in daylight, in settled weather, and never cross the bar on a falling spring against any swell. Top up fuel and water at Port Medoc or Pauillac rather than relying on the city, where bunkering is awkward. And if you have just arrived on the French Atlantic coast from elsewhere, the broad approach planning in our La Rochelle to Gironde cruise notes pairs neatly with this one.
Ride the flood, respect the bar, split the trip over two tides, and the Gironde gives you one of the most rewarding river passages in France. Fight it, and it simply wins.
