Marine Group

  • Cardiff 02920 343459
  • Aberystwyth 01970 611422
  • Port Dinorwic 01248 671500/01248 670176
  • Burry Port 01554 835 691
  • Watchet 01984 322230

Port Dinorwic Marina

180 berths offering year round cruising in the sheltered Menai Strait

Port Dinorwic Marina

180 berths offering year round cruising in the sheltered Menai Strait

PORT DINORWIC MARINA offers year – round cruising in the sheltered menai strait. the picturesque grade II listed marina is ideally placed to help berth-holders explore and discover the beauty of north wales.

In addition to annual and seasonal berths, the marina offers swinging moorings, a tractor park and launch service for motorboats and winter storage ashore for all vessels.

Our brokerage has a range of motor boats and yachts for sale, speak to our staff to arrange a viewing or to list your boat. From our onsite workshops, we offer a range of boatyard services and engine servicing.

The marina has a real sense of community, with a number of businesses situated around the village green overlooking the marina including; a fabulous little cafe; a tapas and seafood restaurant; a hair salon and a beautician.

From the marina, berth holders can sneak away to a quiet anchorage in Rowen Bay or Abermenai Point for a night or two. For those boat owners wanting to venture further afield, Conwy, Holyhead, Porth Dinllaen, Abersoch and Pwhelli are all within easy reach and for the more adventurous the Isle of Man and Ireland are within a day’s sailing.

  • 180 berths
  • Swinging moorings
  • CCTV
  • Free parking for berth holders
  • Electricity to berths with prepay cards
  • Fresh water to berths
  • Dedicated marina office
  • Free wireless internet access
  • Diesel berth
  • Rubbish disposal and recycling facilities
  • Slipway
  • Tractor trailer launch/recovery service
  • 20 tonne lift
  • Short term and long term berths available
  • New berth holders welcomed all year round
  • Secure, sheltered location
  • SeaSafe lifejacket service point
  • Brokerage
  • Boatyard services & engine servicing

First Class Facilities

We offer a range of flexible berthing options with new berth holders welcomed all year round.


£330/metre in advance

Serviced pontoon up to 6 metres £1,540/annum

Unserviced pontoon over 6 metres £225/metre

Unserviced pontoon up to 6 metres £1,345/annum

  • Flexible payment options. Pay in advance or monthly by direct debit (10% surcharge applies)
  • Free hard storage for up to 8 weeks
  • 20% discount on boat insurance with Bay Marine Insurance
  • FREE visitor berthing totalling 30 days throughout the year at other marinas within The Marine Group
  • 50% discount on visitor berthing for up to 7 days in one season at other member marinas.
  • Refer a friend on an annual contract and you could both save £200*
  • 10% discount on labour with our Cardiff Boatyard*

*Terms and conditions apply

Annual berthing

12 tonne £1,810

15 tonne £2,095

Swinging Moorings

Daily/overnight £3.25/metre


Visitor berthing

£160/metre afloat

Hard storage £110/metre

  • Available 1st October to 31st March
  • Book in your winter maintenance


Hard standing monthly £18/metre

Trailer/Kayak/Canoe storage £10.50/week

Take advantage of your boat being ashore and book in your boat maintenance and engine servicing with us.


We offer a range of boatyard services from our onsite workshops including:

  • Boat lifting
  • Antifouling
  • Valeting
  • Rigging
  • Engine servicing

Extensive specialist refit and repair services are available at our main Cardiff boatyard. We offer preferential boat transport rates to our berth holders.

Tractor launch £25.75/visit

Hoist lift in/out £22/metre

Hoist lift out & back in (3 hour period) £24/metre

Step/unstep mast £95

Pressure wash power boat or fin keel £7.50/metre

Pressure wash bilge keel £8.50/metre

Antifouling POA

Cradles £51.50/month

Find out more

Boatyard services

Dangers & Restrictions

A strong tide can be experienced across the entrance to the Tidal Pontoon Basin. Jet Ski’s are not permitted in the Marina. A 5 knot speed limited exists in this area of the Strait. In addition please observe a DEAD SLOW speed limit to avoid creating unnecessary wash.

Contact the dockmaster on Channel 80 before approaching. Both the Lock Basin and Tidal Pontoon Basin entrances dry but are accessible HW + / – 3 hours approx.

No movements in Lock or Lock Basin without permission. To enter lock, from main channel, turn when entrance opens up and keep 10 metres from wall. All movement is controlled by the dock master.

Berth Holders and short stay visitors only – Dries at springs. Strong cross tide at entrance. To enter turn when entrance opens up, beware of departing vessels.


From the North: The Britannia Bridge lies 2 nm to the north of Port Dinorwic. To the south east of the bridge, on the opposite shore to Nelsons Statue is an Historic Wreck. Avoid this by keeping north of the channel until the Straits turn south. The Lock opens up to port 300m after the start of the residential development and below the Hotel Port Dinorwic.

From the South: Provided due care is taken, the passage between Caernarfon and Port Dinorwic is danger free. The lock entrance opens up to starboard 300 mtrs before the end of the residential developments.


Bound North from Port Dinorwic:
The correct time to pass through the ‘Swellies’ is at HW or LW slack. This is -2 Hours Liverpool (-0052PD). However, due to the height and time between the ends of the Straits, passage north at this time means you effectively travel up hill, against the tide. By timing your arrival at Britannia Bridge ( 2nm from PD) – 3 hours before Liverpool (-0152PD)you will gain a favourable tide to Bangor, then a period of relative ‘slack’ until you gain a ‘new ebb’ toward Puffin Island and the northerly exit of the Straits

Bound South from Port Dinorwic:
The tide flows with considerable strength along the full length of this end of the Straits. Provided due care is taken, the passage is danger free between Port Dinorwic & Caernarfon. ( Note buoyage change near Caernarfon). It is best to leave Port Dinorwic early as you will need to push against the last of the flood. The aim is to reach Fort Belan at the southern entrance (to the Straits (5.5.nm) at the top of the tide (-0025PD) This will allow passage over the Bar at maximum depth. Passage over the Bar at half tide is not recommended even in calm conditions.



All new boats must report to the Marina Office on arrival to complete a mooring contract and must have a copy of their full comprehensive insurance document to comply with our terms and conditions. If you require marine insurance Bay Marine Insurance can be contacted for a competitive quote.


The marina makes a fine base from which to explore the outstanding natural beauty of the mountains, lakes and villages of Snowdonia. Mount Snowdon, the highest mountain in Wales, is only a few miles away. The summit can be reached on foot or by the famous mountain railway.


Just 6 miles away is the town of Caernarfon with its famous castle. Begun in 1283 as a definitive chapter in Edward 1st conquest of Wales, Caernarfon was constructed as both a military stronghold and as a seat of government and royal palace.

Further down the coast is Portmeirion ‘The Italian Village, in North Wales’ which became famous as the setting for the 1960s television series ‘The Prisoner’.

Other significant points of interest in the vicinity are the two famous bridges which connect the mainland to the Isle of Anglesey. Thomas Telford’s suspension bridge and Robert Stephenson’s Britannial Bridge. Anglesey also offers a number of attraction and beautiful beaches.

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Refer a Friend and save £200

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Annual Berth Holder Benefits

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Download Current Handbook



For more information or to view our facilities please visit our marina office where our staff will be happy to help.

Monday - Friday9am – 5pm