Guides Guide Any time Updated 9 Sep 2026
Mersea Island from London: the tide that closes the only road
Mersea Island has one road on and off, and the sea covers it. How the Strood works, when it floods, and how to get there from London without being stranded.
Mersea Island is in Essex, about an hour from Liverpool Street plus a short hop, and it is genuinely an island. Not in the poetic sense. Twice a day, for one week a month, the sea closes the only road on and off it and the place is cut off.
That is the whole of what you need to know before you go, so it goes first.
The Strood
The Strood is the only road onto Mersea Island. It is a causeway, and the tide covers it. According to Visit Mersea Island, the authoritative local guide, the tide covers the Strood usually twice a day for one week during the month, and once it does the island really is an island for about an hour and a half.
The number to watch is the tide height. If the tide is 5.00 metres and above, it will more than likely cover the Strood. The local advice is to allow up to an hour and a half either side of high tide to get on or off. Tide times for West Mersea are published and there is a live camera on the causeway.
The one rule that is not negotiable: do not drive through water on the causeway. There is a small local industry in filming people who do.
Getting there from London
Journey times checked on the National Rail journey planner for a weekday departure on 9 September 2026. There is no railway to Mersea. The route is London Liverpool Street to Colchester, fastest 46 minutes direct, with midday singles showing from £37.30, and then onward by bus or car for the last stretch across the Strood.
Plan the return around the tide, not around the train. A missed crossing window costs you an hour and a half whatever the timetable says, and that is the difference between catching your train home and not.
What is actually there
Oysters, principally. West Mersea has been a working oyster town for a very long time and the seafood is the reason most people come.
On the water, the locally owned Lady Grace runs a 20 minute boat trip around the harbour from the Causeway Jetty on Coast Road for a small charge. In peak months a foot ferry runs from East Mersea Point across to Brightlingsea and St Osyth, and it takes children, dogs and bicycles. Outside peak season that ferry runs on request by phone rather than to a timetable.
Is it a day trip
Yes, but a planned one rather than a spontaneous one. The travelling is about an hour and a half each way once you include the last leg, and the tide dictates the shape of the day. Go on a week when the tides are small and it is straightforward; go on a spring tide without checking and you will spend part of the day waiting for a road to reappear.
Beaches near London covers the other coastal options, day trips from London the wider field, and weekend trips the ones worth staying over for.
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Questions people ask
Does the road to Mersea Island flood?
Yes. The Strood is the only road onto the island and the tide covers it, usually twice a day for one week each month. Visit Mersea Island advises that a tide of 5.00 metres or above will more than likely cover it, and that the island is cut off for about an hour and a half when it does.
How do you get to Mersea Island from London?
There is no railway to the island. Take a train from London Liverpool Street to Colchester, fastest 46 minutes direct, then continue by bus or car across the Strood. Allow about an hour and a half each way in total.
When is it safe to cross the Strood?
Local advice is to allow up to an hour and a half either side of high tide to get on or off the island, and to check the published West Mersea tide times before travelling. Never drive through water on the causeway.
What is there to do on Mersea Island?
Oysters above all; West Mersea is a long-established oyster town. The Lady Grace runs 20 minute harbour boat trips from the Causeway Jetty on Coast Road, and in peak months a foot ferry runs from East Mersea Point to Brightlingsea and St Osyth, taking children, dogs and bicycles.
This guide is rewritten rather than refreshed, and everything named in it is checked against the venue's own page. Times and prices change; where a listing links to a venue, that link is the one to trust. How we choose what goes in.