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Lewis Falls on Hwy 89/191/287 when coming into the park from the south.
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A closer look at Lewis Falls
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Near Lewis Falls, Lewis River flows through a large meadow. The exposure is intentionally dark to make the Teton Mountains in the distance stand out. Yellowstone is much flatter than Grand Teton National Park!
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Map at the Old Faithful Geyser visitor center. Old Faithful is at the lower-right. The red spots are other geysers or hot pools. There are lots of them!
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The first hot pool I see while waiting for Old Faithful to blow. Like most hot pools, it's incredibly clear, and it's impossible to see how deep it is.
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This hot pool is bubbling with steam, but it's not quite a geyser, at least not while I was watching it.
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Where the hot pools and geysers run off, they leave colorful streaks. It looks like sulfur, but apparently it's mats of bacteria (microscopic organisms).
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A look at Old Faithful, steaming as it does most of the time
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The Visitors Center and Old Faithful Lodge
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Old Faithful again...
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... It's starting to gurgle...
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... Yes, it's erupting!
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Unfortunately I was almost directly downwind of the geyser so there was a lot of steam blocking the fountain of water. I would do better on the next eruption!
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The runoff from Old Faithful goes into the Firehole River
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More Old Faithful runoff.
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There were quite a few of these signs next to the trails by the hot pools and geysers.
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Old Faithful is part of the Upper Geyser Basin. The next photos are of other hot pools and geysers in this basin. They were quite close together.
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