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Origin of Spoon Lake, Cheam Range #2042
Back To Discussion List Written: 2008.07.29 by: Paul Kubik

It looks to me like the lake was formed by a big rock falling off Lady Peak and creating a crater with the impacted material forming a berm on the lee slope. Can someone confirm this or advance an alternative theory?


Comments

#1062 - 2008.08.02 Frank W. Baumann - My vote is for kettle lake
A kettle lake is a lake formed when a big chunk of ice surrounded by sediment melts away, and the depression that is left fills with water. In this case, the eccentric shape of the lake shore slopes suggests that the ice mass could have tumbled down from a once-existing glacier on the slopes above.

#1060 - 2008.07.30 Paul Kubik - That's the one
That's the one, Bram. A kettle lake is possible. However, I suspect that such a chunk of ice that's required would not have been available for the last hundreds if not thousands of years. At the rate that Spoon Lake seems to be filling in with avalanche detritus, I suspect it will disappear into the meadow in a hundred years or so.

As for the theoretical rock that created the crater - I thought of that. It's not on the surface nearby, that's for sure. The only thing I can think of is it is actually buried below the lake bottom. What's interesting is that there is a perched rock, which is actually the highest point of Lady Peak, in the fall line to Spoon Lake. It's a drop of 400 meters down a steep, even incline. If there's one rock, why not two? It's a good enough drop, a couple of little bounces to get it airbourne, and plop! - Spoon Lake. If you've ever dropped a rock in thick mud, you'll see what got me speculating about it.

#1057 - 2008.07.29 Bram van Straaten - Kettle lake
Do you mean this lake? An origin as a kettle lake seems a lot more likely.

#1056 - 2008.07.29 David Campbell - Maybe old landslide/rockslide deposits
Spoon Lake is definitely in the runout zone from landslides above. Scott is right, where's the boulder. Hard to tell from the Google image, but the lake could be a depression in older landslide deposits, but I wouldn't rule out it being a kettle lake.

Foley Lake, also in the Cheam Range, was formed when a landslide blocked and dammed Foley Creek a couple of hundred years ago.

#1055 - 2008.07.29 Scott Nelson - Where is the rock now?
If that's true, you should be able to find the big rock somewhere nearby.