The first time we brought our 11-metre Dutch steel cruiser up through Paris, in June 2023, I made the mistake of trying to gawp at the bridges. My wife took the wheel off me near the Pont Neuf because I had stopped steering. There is a lot to look at, and almost none of it is at the level of a small boat: the spires, the quays, the tour boats packed three deep at Notre-Dame. The river itself, though, demands your full attention. A loaded peniche heading downstream does not slow for tourists or for you.
Getting into the centre of Paris on your own keel is one of the great inland trips in Europe, and it is more accessible than most people assume. The route from the lower Seine, from Le Havre up through Rouen and on to the capital, is a commercial highway first and a pleasure-cruising route a distant second. Understand that and you will have a brilliant time. Forget it and you will spend three days white-knuckled.
The river is big and it is working
The Seine downstream of Paris is a large-gauge waterway built for serious freight. The boats sharing it with you carry up to several thousand tonnes. They have right of way in practice even where the rules say otherwise, simply because they cannot manoeuvre or stop the way you can.
The single rule that matters most: keep to the right, and pass island channels the way the commercial skippers expect. Boats heading downstream and upstream are generally routed down opposite sides of the islands and around the many bends, and the big barges signal their intentions with a blue board (the panneau bleu) shown on the starboard side when they want you to pass them on what would normally be the "wrong" side. See a blue board, alter to pass green-to-green, and acknowledge it. Ignore it and you have a problem closing at a combined speed of 30 km/h.
Speed limits are real and enforced, especially in the city. On open river sections the general limit runs up to 30 to 35 km/h, but in canalised stretches and near moorings it drops to around 15 km/h, and through central Paris you keep your wash down to almost nothing. The houseboats moored along the quays do not appreciate your wake slopping through their galleys.
VNF, Voies Navigables de France, runs the locks and the navigation, and the lower Seine locks are large, light-controlled, and busy. You wait for the green, you take the lock with the commercials, and you keep clear of the barge that is doing 90% of the chamber. Listen on VHF; the lock-keepers give audible instructions and you are expected to be monitoring the working channel. Using the Seine with a private boat over 5 m also means a VNF toll, the same vignette as anywhere on the network, so sort that before you start. I have explained the bands and how to buy it in the VNF vignette guide.
The run up from the sea: Le Havre, Honfleur and Rouen
Most visitors join the Seine from Le Havre or Honfleur, lock through, and work up the tidal river to Rouen before the canalised section to Paris begins. Rouen sits about 120 km up from the estuary, and from Rouen to Paris is roughly another 240 km with six large commercial locks along the way. The whole Le Havre to Paris run is in the order of 360 km, which most cruisers split over three or four days with stops at Rouen and somewhere like Les Andelys or Vernon.
The tidal section below Rouen is where people get caught out. The Seine floods hard, and the trick everyone learns is to ride the flood upstream rather than fight the ebb. Leave Honfleur to carry the rising tide toward Rouen and you make ground for free; mistime it and you crawl. Rouen is also the sensible place to deal with a mast if you are pressing on into the canals afterwards, because the yards there unstep spars all season. Honfleur's Bassin Carnot does the same.
Heights, depths and what to check before you commit
The lower Seine is deep enough for anything you are likely to be cruising. The constraint that catches people is air draft, not depth, and that only becomes a factor higher up where you might branch off towards the canals. On the Seine itself into Paris you are fine for height; the real planning question is the air draft of the boat you intend to take onward through the canal network, where the limits tighten dramatically. If your onward plan involves the lower-headroom canals, read up first on air draft on the French canals before you fix your mast or wheelhouse height.
The current matters. After heavy rain the Seine runs hard, and an underpowered displacement boat can find itself making four knots over the ground going upstream while the engine screams. We have sat out two days at a pontoon below Rouen waiting for a flood to drop. Build slack into your schedule.
Mooring in the centre: the Arsenal
Here is the part everyone wants to know. You cannot simply tie up to a quay in central Paris and wander off for a croissant. Overnight mooring in the city is restricted to designated ports, and the one you are aiming for is the Port de Plaisance Paris-Arsenal, the marina that sits in the old basin between the Place de la Bastille and the Seine.
You leave the river through a lock at the foot of the basin, just upstream of the Ile Saint-Louis, and you rise into a calm, tree-lined harbour right in the middle of the city. The Arsenal holds around 180 berths and takes boats up to roughly 25 metres. It has water and electricity on the pontoons, showers, and a capitainerie that speaks English. There is no fuel berth inside, so bunker before you arrive.
You must book ahead. In high summer the Arsenal fills, and turning up on spec in July is optimistic. Call or radio the capitainerie before you commit to the lock. Nightly rates depend on your length and the season; budget along the lines of a mid-range French marina rather than a bargain, because you are paying for a postcode you cannot get anywhere else. For the broader picture on what berths cost across the country, our notes on overnight mooring on the French canals are a useful gut-check.
The Arsenal lock itself works to set times rather than on demand, so check the current schedule with the capitainerie and do not assume you can lock in at any hour. The basin has a footbridge that opens for traffic, and the staff sequence boats in and out, so a little patience at the gate is normal. Once inside you are a five-minute walk from the Bastille metro, the Marais, and more boulangeries than is good for anyone.
A note on the canals beyond Paris. If your plan is to carry on south through the network rather than turn round, Paris is where the river ends and the proper canal cruising begins. The locks shrink, the pace drops, and the boat-size limits start to bite. Before you commit to that onward leg, the complete beginner's guide to cruising the French canals is the piece that ties together the licence, the vignette and the dimensions you have to respect.
A few hard-won habits
We always brief the crew before the city section: fenders both sides, lines ready, no one wandering on deck without telling the helm. We keep the VHF on and the engine warm. We do not stop for photographs in the navigation channel, ever.
And we go early. The river through Paris at eight in the morning, before the tour fleet wakes up, with the light coming off the Conciergerie and a single barge ahead of you, is worth every nervous mile of the approach. I have done it four times now. I would do it again tomorrow.
The Seine into Paris is not a difficult trip for a competent crew on a sound boat. It is a busy one, and it rewards planning, courtesy on the radio, and a healthy respect for anything bigger than you, which is almost everything.
