Too much silt can destroy fish eggs and kill aquatic plants, the Environment Agency says
Traps to capture silt are to be built near a North East river in a bid to tackle pollution.
The Environment Agency said in recent years the River Leven, a tributary of the River Tees, had been failing water quality tests.
To tackle the problem it has joined forces with the Forestry Commission, Egger Forestry and local farmers.
A spokesman for the agency said too much silt could kill fish eggs and silt traps would tackle the problem.
Ian Marshall, spokesman for the Environment Agency, said pollution was also damaging to aquatic plants.
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