Abandoned mining sites, interesting rock formations, and cold water geysers are just a few of things you can find around the lower end of the San Rafael River, where it converges with the Green. We ended up exploring this area near the end of February. Early spring is a great time to visit. Time it right, and the temperatures won't be too hot or too cold.

Most of our time was spent on the network of dirt roads that crisscross the San Rafael Desert south of Green River, Utah. The roads are long and unsigned, so it wouldn't be hard to make a wrong turn. Thanks to a few well placed GPS waypoints, we didn't have to waste time figuring it out.

While cruising along the dirt roads, we passed rock formations of every color. The geology was fascinating. Watching multi-hued rocks whip past made me more aware of all the things I wish I had time to learn—geology for instance. Too bad I didn't have a minerologist to bring along.

After getting out of our trucks to walk around, we found old wagon parts, rusted cars, and a cold water geyser. The bubbling hole in the ground seemed mild-mannered enough when we first stumbled across it, so it caught us totally off guard when it erupted about five minutes later. The geyser spewed water over fifteen feet up into the air, from a hole about two inches in diameter. There's a few of these geysers scattered about the area, including the more well known Crystal Geyser down on the Green River. We were lucky to hit this one just as it was erupting.

The geysers were created in the 1940's, when miners drilling exploration wells hit a carbon dioxide-rich aquifer confined underneath the dense upper layers of rock. The difference in CO₂ pressure between the aquifer and the atmosphere brings the water spewing up to the surface. What you end up with is something like shaking a can of pop, then cracking it open. If you want to get in touch with your inner child, feel free to run through the water like a kid with a sprinkler. Just don't complain when you end up smelling like salt, rusted iron, and other strange chemicals.