The bridleway and cycle route has been built on private farmland with the support of the landowner and with funding and help from Dorset Council and Dorset National Landscape Partnership.
Mr Grafton said: "It's a real win for accessibility for this whole part of Dorset.
"We were nearly there about two years ago when we discovered the track of the path ran over a gas pipe.
"That held us up for 18 months. We finally got clearance in November-December time.
"It's turned into something much grander than I was expecting and it's now part of the Dorset path infrastructure."
The path allows walkers, cyclists, disability scooters and horse riders to reach the top of the hill at Quarr Lane which links to public footpaths and minor roads.
Campaigners hope a second phase, connecting Quarr Lane to Symondsbury and Bridport, can begin next year.
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