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A Brand New Adventure

A Brand New Adventure

An exciting NEW open water swim event for 2023

Swim across Grafham Water in Cambridgeshire

We're delighted to be the first to give you access to swim across this amazing reservoir. The reservoir was created in 1965 and you'll be the first people to experience the adventure of swimming across its width.

SwimGrafham: 20/08/2023

Grafham Water: Cambridgeshire

Distances: 500m, 2km, 4km, 6km, 8km

Start time: 6:30am

Cut Off: 09:45am

Entry fee: £25.00 - £60.00

Swimmers must be 15 years old on the day of the swim.

Entry includes:

Swim hat

Finisher Medal

Chip timing

Advanced medical support and safety cover

Free Parking

Free event photos

Enter Now


An epic course

We're swimming straight across the middle. It's an epic course and a stunning achievement to swim this route. We wanted this to be an adventure.

The course starts on the south shore, turning at various points for distance options. The turn point on the North shore is for those in the 4km event. (2km shore to shore)

The course is big, exposed and extremely exciting. We're here with the team to keep you safe and ensure you have a great experience.

Conquer Grafham Water with us.

SwimGrafham Course map.jpg

500m - The perfect starter swim challenge.

Experience the thrill of this open water swim course in a manageable distance, 

All welcome, no experience necessary, age 12 and above.

2km - Swim to the heart of the lake.

The 2km course goes from the south shore, to the middle of the lake and back.

You really get to experience the full size and scale of Grafham water from this amazing perspective.

4km - Out and back

The 4km swimmers get to swim from bank to bank (then back) in two full crossings of Grafham water. 

6km - Out and back 1.5

A monster swim with 1.5 full loops of the course. For experienced open water swimmers up for a huge challenge. 



Please note the temperature ranges before entering the event. 

16c and under = wetsuit compulsory
16.1c and above = wetsuit optional in all distances
23c = Advisory Non-wetsuit for 4km
24c = Advisory Non-wetsuit for 6km


If the water temperature does not reach 16.1c, this will be a wetsuit compulsory event. Please consider this when entering. There will be no transfers or refunds made because of the wetsuit policy. 


The upper limit is discretional. We advise that you don't wear a wetsuit above these temperatures but acknowledge not everyone is here to swim as fast as possible and might require the extra warmth.

The policy has been agreed with the lake owners using industry best practice and our collective knowledge of the venue. Temperatures will be adhered to; no exceptions will be made. Unfortunately, we cannot make additional allowances for experience or preference. We appreciate your continued understanding.


Swim floats are compulsory for this event 

They are designed to make you visible without impeding your natural swimming stroke.

We loan our swim floats for free to all competitors. No need to book, no need to make any arrangements.

They will be ready to collect on the morning of SwimGrafham if you would like to use one. 

We believe that they offer our swimmers the best possible safety during our event.  

swim floats

How to Find Us

Parking is accessed via the Fishing lodge south shore entrance:

Grafham Water Visitor Centre

Marlow Park



PE28 0BH

Please follow event signs from the main road.

Contact Us

Please note; we might be more difficult to contact during race week.

Mark all urgent enquiries with URGENT SwimGrafham in the title and we will get back to you as soon as possible. 

Important Stuff