June 5, 2021 drive, going north, through the western side of Yellowstone. Starting at the Upper Geyser Basin, passing through the Midway Geyser Basin, Lower Geyser Basin, Monument Geyser Basin, and Norris Geyser Basin.
The Upper Geyser Basin-Yellowstone’s largest geyser basin and in fact, the world’s largest single concentration of hot springs- occupies about one square mile. Located between the Old Faithful area and the Biscuit Basin road, the Upper Geyser Basin contains several groups of hot springs, including over 150 geysers. The basin is less than a half-mile wide and most of its geothermal features are situated within a few hundred feet of the Firehole River. It is recommended that those planning a visit to the Upper Geyser Basin spend a good portion of their time here.
Although Midway Geyser Basin is small, it is home to some of the largest single hot springs in the world. The most notable geysers and hot springs are Grand Prismatic Spring, Excelsior Geyser, Turquoise Pool, Opal Pool, Flood Geyser, Spray Geyser, and Imperial Geyser. The last two require a moderate hike behind the Grand Prismatic. Grand Prismatic Spring is Yellowstone’s largest single hot spring and the world’s third largest hot spring. This was the park’s earliest described feature in 1839, when it was written about by fur trapper Osborne Russell. The enormous pool is not only huge; it’s colorful. Notice the steam that is suspended in the air directly above the large spring. The steam reflects the colors of the rainbow. One naturalist describes viewing Grand Prismatic as being “like walking along a beach of color.”
Lower Geyser Basin is located between Madison Junction and the Old Faithful area and is home to approximately 100 geothermal features. Combined, these features cover five square miles and include all four types of features, including fumaroles, hot springs, geysers and mud pots.
Yellowstone’s hottest geyser basin is Norris Geyser Basin. A research drill hole at the basin found a temperature of 459 degrees F (237 degrees C) at a depth of only 1,087 feet. Many geyser-gazing experts feel Norris Geyser Basin is the most exciting and unpredictable of the various basins in Yellowstone. Two very different basins make up Norris Geyser Basin: Porcelain Basin and Back Basin. Back Basin has impressive geysers like Echinus Geyser, while Porcelain Basin is home to many hot springs, vents and pools.
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