You can't miss it from Hwy 93 in both directions - it's huge. You can drive right up to the toe of the glacier, where you can see the full extent of the glacier. Plenty of free parking off the hwy. From the car park, you can walk across the area where the glacier has retreated and there are date markers where the toe of the glacier used to be. It has retreated a lot over the past 100 years. You cannot walk on the glacier from this point, unless you have booked an individual guide. We did the Monster truck tour on our return journey, but from the toe you get a much wider perspective of the whole glacier and on opportunity to see the detail of the terminal moraine etc. Wonderful - and free.
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