Essex Rivers Hub

Upper Sandon Brook Pressures

The table below shows the current pressures that this waterbody faces and the solutions that could be put in place to solve these problems. You can learn more about some of these pressures and solutions on the Environment Agency Catchment Data Explorer or you can contact us to find out more.



American Mink have been most recently recorded on this water body in 2008. American Mink cause a wide range of problems on a river, including playing a large part in the local extinction of many natural species such as water voles and kingfishers.

In order to eradicate mink, they must be trapped and dispatched. Trapping must be done catchment wide as mink can travel large distances. It is important that there are enough people involved in a trapping project to ensure that the traps can be checked regularly. Monitoring mink, water vole and otter presence on your river can also help us when planning eradication programmes.

Signal Crayfish have been most recently recorded on this water body in 2012. Signal Crayfish cause changes to the natural bankside habitat and also out-compete our native crayfish. They are fierce predators and can completely change fish and invertebrate communities so that they are no longer in their natural state.

There is currently no known solution to the invasion of Signal Crayfish, regular monitoring is needed to ensure a strategic approach when a solution has been identified.

Sandon bridge gauging station is a barrier to fish.

Follow the solution listed under fish passage.

The Sandon Brook gauging station has been assessed and it is confirmed to be a barrier to fish but not eels.

Modify the structure to allow fish to pass.

There are a number of water abstractions that take place on this waterbody that could impact the flow dynamics of the system. This waterbody has problems with its fish population; un-natural flows could be contributing to this.

Carry out further investigation to determine the impact of flow on this waterbody and the fish populations.

Phosphate levels in this waterbody are classed as poor. This is likely to be because of diffuse agricultural pollution as the majority of this waterbody is lined with agricultural based land.

Engage landowners to encourage best practises for use of phosphates.

Increase riparian buffer strips to encourage nutrients to settle out before entering the river.


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