Lake McDonald is the largest of the more than 700 lakes that make up Glacier National Park in Montana. McDonald has a surface area of 6,823 acres, and it is also the longest (more than 9 miles) and the deepest (450+ feet). But as impressive as all those numbers are, it’s the lake’s shoreline that I find the most amazing. Lake McDonald is famous the world over for its beautiful, multi-colored pebbles. The rocks range in color from reds and yellows to greens to blues. The candy-colored pebbles are found in great abundance on the shore and under the water on the western side of the lake. And the fact that the lake enjoys (?) year-long low temperatures that prohibit the growth of plankton, the water is crystal clear, showing off all those beautiful colors beneath the surface.
“The color of the rocks is determined by the presence or absence of iron. The bright red rocks found along the Grinnel Glacier trail were deposited in a shallow ocean environment where the iron was oxidized by the tidal exposure to the air. Rocks with this coloration often have old ripple marks or ancient mud crack lines.
The rich green-colored rocks were formed in deeper water than the red rocks. Although these rocks contain the same quantities of iron-bearing minerals, they did not have the same exposure to oxygen and the amount of oxidization was limited.” Glacier-Waterton International Peace Park by Vicky Spring and Tom Kirkendall
We are very much looking forward to planning a family trip there. Our 5-year-old niece is particularly obsessed with rocks (I thoroughly expect her to grow up to be a geologist), and I know it’s really going to thrill her. We’d better bring an empty suitcase for rocks!
You can check out all the beautiful lakes of Glacier National Park on their website.
May 1, 2018 at 5:21 am
Wow, that really is beautiful. Another stop to add to my bucket list! Thanks.
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May 1, 2018 at 10:14 am
Such a remarkable place. Hope you get to see it!
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May 1, 2018 at 7:20 am
You can find purple, green, yellow and coral coloured pebbles on the beach at Gabarus, Cape Breton, Nova Scotia. They are more pastel in colour, but still striking. http://www.gabarus.ca/gallery/projects-pics
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May 1, 2018 at 10:15 am
Wow! Those are lovely!
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May 1, 2018 at 7:25 am
This is so beautiful! I’ll add Montana to my bucket list, but it would be much easier to get to Gabarus, Cape Breton, Nova Scotia. Also of note, we have “Glassy Beach” here in Newfoundland. The location is not well known, but I’ve been there and it’s awesome. It’s a very small half-moon shaped pebbled beach; and as far down as you dig, you’ll come up with beach glass. You’re not permitted to take it away though.
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May 1, 2018 at 10:16 am
I’m positively obsessed with beach glass! I don’t think I could be counted upon not to nick some, though.
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May 1, 2018 at 8:04 am
Wow. I had no idea. Now I have to go.
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May 1, 2018 at 10:16 am
Road trip!
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May 1, 2018 at 10:50 am
There is something about crystal clear water that makes me want to learn Scuba , or change into a mermaid.
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May 1, 2018 at 12:03 pm
I’m with you, though I’m going to vote for the mermaid route. The equipment is cuter.
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May 1, 2018 at 1:04 pm
Reblogged this on Ancien Hippie and commented:
And a happy May Day to you too
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May 1, 2018 at 1:40 pm
Wow! What a cool place. Those pebbles are gorgeous.
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May 1, 2018 at 4:03 pm
I’m really worried that if we go, we’ll bring home half the pebbles in the lake. I never could resist a pretty rock…
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May 2, 2018 at 4:11 pm
Absolutely gorgeous!!
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May 2, 2018 at 7:31 pm
Really a cool spot.
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May 2, 2018 at 7:03 pm
“…enjoys (?) year-long low temperatures…” made me laugh.
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May 2, 2018 at 7:32 pm
Me, too!
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May 2, 2018 at 7:05 pm
Ohhhh! I wish I had known about this when I went to Glacier years ago. Now I’ll have to go back!
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May 2, 2018 at 7:32 pm
You’ve been? Was it wonderful?
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May 2, 2018 at 9:12 pm
I need to go there now
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May 2, 2018 at 9:52 pm
Don’t we all!
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May 3, 2018 at 2:10 pm
How do people resist filling their pockets with these rocks? So pretty.
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May 3, 2018 at 7:28 pm
I suspect most people go home with one or two in their socks…
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November 7, 2022 at 6:11 pm
Can you take the rocks?
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