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Latest Information Updates

Clayhithe 48 hour visitor mooring partially closure

Gap has been identified between the bank and concrete 48 hour mooring. So it partially closed at the upstream end, pending restoration works to ensure river user safety.

Conservators of the River Cam - Emergency Closure Notice

Where: Jesus Green Lock closed to navigation

When: Friday 8th September - until rescinded

Why: Structural safety issues. Scheduled repairs due to start during October and are likely to take 3 months.

Please Note: As warned in the section "Navigation and Towpath Updates" below, due to current mechanical failure of the Conservancy's main harvester, normally used to cut and collect weed from the navigation, weed cutting is currently being undertaken by a much smaller vessel which does not have the capacity to remove the cut weed at the same time. This causes rafts of floating cut weed, which will be raked up separately, after the cutting has taken place, at regular intervals. The decision has meant that weed cutting continues but at a slower rate than usual with the inconvenience of the floating weed for periods of time.  Please take care when using the river.  

Navigation and Towpath Updates 07/09/2023

Seasonal Activity

Weed cutting Debris

River users should note that due to mechanical problems with the Conservancy’s large Berky harvester the contractors will be using the smaller Conver harvester for an anticipated 6 weeks. It should be noted that during this time there will be significant weed debris on the river due to the requirement to carry out the cutting works in certain areas first and a clear-up afterwards. Please see below for further details.

Weed Cutting Schedule

This week commencing Thursday 7th September 2023 until 22nd September weed cutting will take place between Baits Bite Lock and Jesus Green Lock. This may vary in location along that stretch due to a number of variables.

It is anticipated that the weed cutting will commence between Baits Bite Lock and Bottisham Lock from 25th September.


The exact dates may vary.

Boat Registration

Annual Boat Registration
The 1st of April to the 31st of March the following year represents the registration period for all boats/vessels that  use the River Cam. River users should be aware that to use a vessel on the navigation without a valid licence representing the vessels annual registration, is a breach to the Conservancy Byelaws. The byelaw requirements for this are set out in our byelaws section 8. Registration of Boats. Please ensure your vessels are appropriately registered.

The Conservancy send out reminders to register to current licence holders each February, therefore it is important for vessel owners to ensure that the contact information held is accurate and up to date. Please contact our team to update your details should they change during the year.

For Applications and further information please visit the Boat Registration Tab.

Visiting Vessels

Visiting Powered vessels that hold a valid Anglian Pass, available from the Environment Agency, clearly displaying their unique vessel number are considered registered to use the Conservancy navigation. It should be noted that all necessary conditions of the Anglian Pass must be met.

Details of the Anglian Pass may be found on the following website page:

It should be noted that there are no Visitors Passes or Visitor registrations other than the Anglian Pass. Vessels visiting for event participation should contact the Event Organiser for details regarding accessing the Conservancy  navigation.


Pennywort is an invasive species which is to be found along the river Cam and in other waterways around the country. As such managing it is the responsibility of the Environment Agency, however the Conservancy and it's contractor works alongside volunteer groups in removing it from the river where possible. Groups such as Cam Valley Forum and the Cam Sailing Club are particularly active in monitoring it and initiating clearance. If you spot pennywort, please let us know, where possible we will try and organise it's removal.



Dead fish  incident being investigated

On Tuesday 20th June dead fish were appearing on the River Cam. Both the EA and Anglian Water went to the site testing water for oxygen levels and pollutants between Baitsbite Lock and Chesterton. Scientists were called out. The Chair of CFPAS reported at least 1,000 dead fish. The EA are seeking to identify the cause of this event. 

Any relevant information should be reported to the EA on their hotline 0800 80 70 60

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