When Cow Green Reservoir was constructed in Upper Teesdale, NE England, the flow of the young River Tees became much more controlled.
Most of the time, if you visit High Force waterfall, you will only see the Tees thundering over the Great Whin Sill via the channel on the left side of this view.
However, turn up after a period of heavy rain and you can still catch the magnificent site of a double waterfall, not to mention the roar created by all that peat-stained water plummeting 70 feet (21 m) into the pool at the base of the falls.
The popular visitor attraction is around 5 miles west of Middleton-in-Teesdale and lies within the North Pennines Area of Outstanding Natural Beauty (AONB) and the European Geopark.
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