The Bowlees Visitor Centre, housed in an old Methodist chapel, is worth a visit either before or after your walk.
[1] From the Centre, follow the track that heads north-west past Ash Head Farm.
There are lovely views from here up and down Teesdale.
The track descends to Dirt Pit hamlet (an undeservedly unflattering name), where you join a lane and bear right, continuing in the same direction. After around 1km, turn left at a gate with the name Birch Rigg on it and follow the footpath up past the house, continuing across fields, then along a grassy track to a tarmac lane. Stay on the lane to bring you down to the main valley road – the B6277 – where there’s a Methodist chapel opposite (NY871295).
[2] Turn right and almost immediately left down a track that leads to a bridge over the River Tees. Cross and bear right along a footpath that soon runs alongside the Tees (on its south side). From the bridge you follow the Tees for approximately 4km/2½ miles – it’s gentle walking, though the surroundings become progressively wilder as you head west.
The area you are now in is part of the Moor House-Upper Teesdale National Nature Reserve.
As the valley narrows between Cronkley Fell and Widdybank Fell, where the path is hemmed in by the river on one side and the foot of Cronkley Fell on the other, there are boardwalks to help facilitate your progress.
[3] When the riverbank broadens out on your side, keep a look out for a path on your left (NY828281) that heads east up the steep slopes of Cronkley Fell. The grassy path up the heather-clad slopes should be obvious, as should the cairn at the top.
There are good views back over the Tees Valley from here.
Cairns lead you onwards across the plateau.
(A) Note a number of fenced enclosures, erected to prevent further erosion of the unique ‘sugar limestone’ soil which supports a species-rich type of limestone grassland.
The grassy track – known as the Green Trod, a former droveway – leads you down the other side of the plateau to a junction with a footpath (at NY861280).
[4] Turn left to join the Pennine Way. There’s a stone marker here with arrows and the initials PW and GT – Pennine Way and Green Trod - on it.
[5] Turn right along the well-marked Pennine Way.
(B) This leads you first past spectacular High Force (NY880284), where the River Tees drops 21m/69ft over the Great Whin Sill into a plunge pool below.
Further on you come to attractive Low Force. Turn left to cross the Wynch (suspension) Bridge and follow the path up to the road, and thence back to the car park.