I think its four or five.
The Colorado river is not man made, but a reservoir on the river named Lake Powell is.
The man who traveled the Three Forks area and explored the Cimarron River was Thomas Nuttall. The Cimarron Rivers is located in the states of Colorado, Oklahoma, and Kansas.
The Colorado River includes Lake Powell and Lake Mead.
The Blue Mesa River is the largest man-made lake in Colorado!
The famous man-made structure located on the Colorado River is the Hoover Dam. Completed in 1936, it was built to control flooding, provide hydroelectric power, and supply water for irrigation and municipal use. The dam creates Lake Mead, one of the largest artificial lakes in the United States, and is a popular tourist destination known for its impressive engineering and scenic views.
Naturally made by the Colorado River. Which took millions of years of erosion.
There is no record of anyone exploring the Colorado and Green Rivers until John Wesley Powell in 1869 and 1872. There are inscriptions along the Colorado and Green Rivers by a man named D. Julian that were in place before Powell's expedition, but no information is available as to who he was or when he was on the river.
The Man from Colorado was created in 1948.
The duration of The Man from Colorado is 1.67 hours.
The Grand Canyon is Physical Geography because it wasn't made by man, it was formed by the Colorado River
The first man known to navigate the Colorado River was John Wesley Powell, an American explorer, geologist, and soldier. In 1869, he led a daring expedition down the river, which included traversing the Grand Canyon. Powell's journey was significant for its scientific contributions and for mapping previously unexplored regions of the American West. His adventure is often celebrated as a remarkable feat of exploration.
He was the first white man to travel overland from the Salt Lake frontier, the Colorado River, the Mohave Deserts, and into California.