The bridge at Whitebridge is one of the so called „Wade Bridges“, built in the course of establishing roads through Scotland for quick military access to counter the Jacobite risings. The effort was lead by George Wade, then Commander in Chief of His Majesty’s forces, castles, forts and barracks in North Britain, and later promoted to Field Marshal. Wade directed the construction of about 390 km of roads and as many as 30 bridges in Scotland, including the Tay Bridge at Aberfeldy. General Wade’s military roads linked the garrisons at Ruthven, Fort George, Fort Augustus, and Fort William.
Edit: Oh, and Johnson and Boswell very probably had to pass this bridge and did stop at the old Kingshouse at Whitebridge, too:
From James Boswells Diary, The Journal of a Tour to the Hebrides with Samuel Johnson:
Monday, 30th August 1773: Inverness, Fort Augustus
„We might have taken a chaise to Fort Augustus, but, had we not hired horses at Inverness, we should not have found them afterwards: so we resolved to begin here to ride. We had three horses, for Dr Johnson, myself, and Joseph, and one which carried our portmanteaus, and two Highlanders who walked along with us, John Hay and Lauchland Vass, whom Dr Johnson has remembered with credit in his Journey, though he has omitted their names. Dr Johnson rode very well.
About three miles beyond Inverness, we saw, just by the road, a very complete specimen of what is called a Druid’s temple. There was a double circle, one of very large, the other of smaller stones. Dr Johnson justly observed, that, ‚to go and see one druidical temple is only to see that it is nothing, for there is neither art nor power in it; and seeing one is quite enough‘.
It was a delightful day. Lochness, and the road upon the side of it, shaded with birch trees, and the hills above it, pleased us much. The scene was as sequestered and agreeably wild as could be desired, and for a time engrossed all our attention. …
… We dined at a publick house called the General’s Hut, from General Wade, who was lodged there when he commanded in the North. Near it is the meanest parish kirk I ever saw. It is a shame it should be on a high road. After dinner, we passed through a good deal of mountainous country. I had known Mr Trapaud, the deputy governour of Fort Augustus, twelve years ago, at a circuit at Inverness, where my father was judge. I sent forward one of our guides, and Joseph, with a card to him, that he might know Dr Johnson and I were coming up, leaving it to him to invite us or not. It was dark when we arrived. The inn was wretched. Government ought to build one, or give the resident governour an additional salary; as in the present state of things, he must necessarily be put to a great expence in entertaining travellers. Joseph announced to us, when we alighted, that the governour waited for us at the gate of the fort. We walked to it. He met us, and with much civility conducted us to his house. …“