Cool is a small town in El Dorado County. It has only one flashing red light at the intersection of Hwy 49 and Hwy 193. If you go straight on Hwy 49 you will come to Placerville, California (aka: Hangtown), but if you turn left at this intersection onto Hwy 193, you will be heading toward the town of Georgetown, CA, another historic town 14 miles down the road.
Originally they wanted to call Cool, "Cave Valley" because of the limestone cave in the area. However, due to the fact there was another town by that name; Cool was named after Aaron Cool. Cool is approximately five miles from the confluence of the North and Southern Forks of the American River.
The bridge that crosses Hwy 49 at the confluence, marks the El Dorado and Placer county boarders. The town of Cool is approximately 15 miles from Coloma, California where gold was discovered at Sutter's Mill; that discovery marked the beginning of the California "Gold Rush." Lastly, there is a trail through Cool that is unobstructed and goes clear to the Tahoe area (approximately 100 miles). This trail is used for long distance runners and every year there are endurance races for runners and horse riders.
The first post office was established in 1885. Penobscot Public House, established in 1850, was a way station and stage coach stop during the days of the Gold Rush. The famous Penobscot Ranch still exists today. Today the historic site, including the house built during the days of the Gold Rush and the barn built in 1923, can be viewed by driving down Highway 193 four miles outside of the business center of Cool.