From Devil's Bridge you ride through countryside surrounded by hills on the A4120 road, (turn left on the A44 if you need fuel, BP fuel is just a short distance on the right or alternatively fill up in 18 miles (29km) at Llanidloes) then briefly join the A44 before turning onto some smaller roads as you cross over the River Severn twice and make your way to a coffee stop at the Clywedog Reservoir and Dam. The dam was built between 1965-67 to regulate the flow of water in the River Severn, both as a protection against flooding of the upper sections of the river during the winter months and also to ensure the maintenance of a minimum flow in the river during the summer. The construction of the dam and lake throw up a number of interesting statistics. The structure is the tallest mass concrete dam in Britain, standing fully 236 ft (72m) high. It is 750 ft (229m) long, and holds back some 11,000 million gallons of water. The weight of concrete used in the construction of the dam is equal to 7 times the tonnage of the QE2 cruise liner, in all some 200,000 cubic metres; enough to build 28 miles (45km) of six lane motorway. As you leave, you will have a great view of the reservoir and dam from up high just a 100m up the road. The reservoir is never far away for the next few miles, then the road drops down to water level before you leave it behind you.

The majority of this route uses 'roads less travelled' so you won't encounter too many other tourists. As you enter the Snowdonia National Park, you must stop at RP 14 for a view or photo of Pont Minllyn, a bridge spanning the River Dovey (Dyfi). The miniature proportions and mossy green appearance of this two-arched bridge give it a fairytale feel, but it was actually built for practical workaday reasons in the early 17th century to allow packhorses to cross the river.
Follow the River Dovey for a few miles and you will come to a sharp hairpin bend takes you up a steeply sided valley and onto a vast open moorland offering breathtaking views. The road is single track but the only thing that you'll likely encounter are sheep. As you descend from the high ground you arrive at Lake Vyrnwy, set in such a beautiful location, the mountains embrace the lake that contains some twelve billion gallons of water resulting in scenery reminiscent of the Alps. The lake which is 5 miles long and half a mile wide looks incredibly natural and you can hardly believe that it was created by man in the late 19th century to provide a storage reservoir of safe water for the rapidly growing city of Liverpool.
The road leaving the reservoir is single track again and equally as beautiful, this time though it's through a heather covered valley that will take you to touristy, honey pot, market town of Bala on the shore of Bala Lake, or Llyn Tegid. You can choose to have some lunch here or continue the route following the narrow-gauge railway which runs along the east shore of the lake to Llanuwchllyn where I have chosen the Eagles Inn as a lunch stop. The Eagles Inn (Tafarn Yr Eryod) is a wonderful stone built building, even older than the village church that serves delicious home made food!

After lunch, a single track road heads up the Afon Lliw valley into what must be one of the least visited parts of Snowdonia National Park. The road has several gates as it rises up to open moorland with grazing sheep. Please leave each gate as you found it (open or closed). Again, more breathtaking views, to the north you see the peaks of Arenig Fawr (854m) and Moel Llyfnant (751m) and as you reach the summit the mountain range of the Rhinogs dominate the view ahead of you to the west.
After joining the A470, you will pass Lake Trawsfynydd, created 100 years ago to supply water for a hydro-electric power station. Then in 1965 the reservoir became the source for cooling water for a nuclear power station, in 1991 the nuclear power station was shut down and is now in the process of decommissioning. Work will be completed in 2083!!
RP 32 takes you past the beautiful settings of Lake Mair, created in 1889 by William Edward Oakeley, owner of a slate quarry as a 21st birthday present for his daughter Mair and as a water supply.
Next comes the Nant Gwynant Pass and it's two natural glacial lakes joined and fed by the River Glaslyn. The second of the two Lakes, Gwynant was used as a filming location in the 2003 film 'Lara Croft Tomb Raider: The Cradle of Life'.
Views of Mount Snowdon are visible through this valley pass.
Take a left turn onto the A4086 that'll take you through the Pen-y-Pass. At the top of the pass is a car park and a good place to stop for photos and maybe a coffee. This spectacular pass is one of my favourites and has a jurassic feel about it with scattered boulders covering the mountain pass floor. You feel part of it when riding through it on a motorcycle.
The end of the route is at Nant Peris as you descend towards Llanberis. Nant Peris has a few campsites for pitching a tent or the town of Llanberis just down the road has many hotels and B&Bs; for your overnight stay. I have include links for a couple of campsites below this review. Enjoy.