Harbour Information (use the icons to find out more)

Port Dinorwic / Y Felinheli (almanac stub) and Menai Strait

Your Comments: 3 Read or add your comments

Courtesy Flag

Flag, Red Ensign


From South 53° 06.450N 004°25.001 (Caernarfon Bar Light) From North 53°18.82N 004° 02.28W


AC 1464-1 Menai Strait South; AC 1464-2 Menai Strait North; AC 1464-3 The Swellies; AC 1970 Caernarfon Bay; SC5609 North West Wales including the Menai Strait; Imray C52 Cardigan Bay to Liverpool (includes plan of Menai Strait)

Rules & Regulations

There is a 5kt speed limit in parts of the Strait marked by “5 Knot” buoys


The Swellies. Strong currents and whirlies everywhere at the strong parts of the tide

Tidal Data Times & Range

HW Port Dinorwic is 20 mins before HW Holyhead MHWS 5.6m MHWN 4.4m MLWN 2.0m MLWS 0.8m   (links)

This site is designed for slower, roaming broadband connections, like you would get at sea, so it needs JavaScript enabled to expand the text.

General Description

Harbour Master tel 01248 671500; VHF #80;
Port Dinorwic Sailing Club tel 01248 671147,
... read more


This is where the fun starts. There are very strong............... ... read more

Berthing, Mooring & Anchoring

You would be wise to contact the Harbour Master to tell him you are arriving and find out where he wants to park you. The most probable options will be the Marina Dock on the Strait or the tidal basin inside the lock.   ... read more

Your Ratings & Comments

Written by Don Thomson 3 | 7th Sep 2022
No changes apart from tariff.
Written by Don Thomson 3 | 10th Aug 2021
I reviewed these notes in August 2021. Firstly, this marina is now run by the Marina Group along with about half a dozen Welsh Marinas. Their main website covers all these Marinas and unless you download their brochure (which again covers all the Marinas) you will get frustratingly lost. Our link in the Berthing and Mooring section takes you straight to the pages you need in their multi facetted IT. The posh hotel on the hill above the marina is ambiguous as to their attitude to non-residents and enquiries have been made.
Written by Don Thomson | 20th Apr 2018
There are no changes apart from the prices.
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