[1] While there are no roads alongside the loch, the West Highland Line follows its eastern bank.

[1] In 1929, Loch Treig was made into a reservoir, retained behind the Treig Dam, forming part of the Lochaber hydro-electric scheme, which required diversion of the West Highland Railway.

[2] The increase in water level following the construction of the dam submerged the hamlets of Kinlochtreig and Creaguaineach at the loch's southern end, which were stopping points on a cattle drovers' road along the Road to the Isles, which linked up Lochaber and the Inner Hebrides to markets in Perthshire in the south.

1947), a self-described hermit, has lived alone in a rough cabin on the shore of Loch Treig for forty years.

[3][4] Laura Miller opined in 2024, he "may be the most famous living hermit in Great Britain".