If I recall properly, there are three lakes in the province of Alberta that share the name “Chain Lakes.” This is the southern one, near Nanton. I checked into the area’s history and apparently it used to be three small, linked lakes that drained into the nearby Oldman River via Willow Creek. When the south and north dams were built in 1966, this long (over 10 km), narrow (>500 m) sliver of a lake was created.
I took this rather moody photo from our boat, on a cool evening this past August. The skies were heavy with forest fire smoke.