I’m not sure how it compares to Glen Canyon size-wise, but it was among the tallest I’ve seen. There is a truck parked in front of the red building that will give some scale. You have to go there on purpose – the dam itself is about 50 miles off of I-90 and the lake extends into northern Wyoming. You can’t (easily) get to the southern end from the northern except via boat.
I’ll be the first to admit that we didn’t come anywhere close to doing Montana justice. We basically cut enough of the corner between Wyoming and North Dakota to count it as a “visit” (even still, it was 300 miles!) but purposely decided ahead of time that it was a state we would revisit later to explore in more detail.
Our visit was essentially limited to a stop at the Little Bighorn Battlefield National Monument. It was a cold, wet day with the precipitation fluctuating between rain and snow, and my photos reflect that. While I’m sure that sunny weather like we saw for most of our trip would have made it more beautiful, the gloomy weather made for appropriate conditions at a place that has such a dark role in American history.