The Colorado River is formed by the junction of the Grand and Green.

The Grand River has its source in the Rocky Mountains, five or six miles
west of Long's Peak. A group of little alpine lakes, that receive their
waters directly from perpetual snowbanks, discharge into a common
reservoir known as Grand Lake, a beautiful sheet of water. Its quiet
surface reflects towering cliffs and crags of granite on its eastern
shore, and stately pines and firs stand on its western margin.

The Green River heads near Fremont's Peak, in the Wind River Mountains.
This river, like the Grand, has its sources in alpine lakes fed by
everlasting snows. Thousands of these little lakes, with deep, cold,
emerald waters, are embosomed among the crags of the Rocky Mountains.
These streams, born in the cold, gloomy solitudes of the upper mountain
region, have a strange, eventful history as they pass down through
gorges, tumbling in cascades and cataracts, until they reach the hot,
arid plains of the Lower Colorado, where the waters that were so clear
above empty as turbid floods into the Gulf of California.

The mouth of the Colorado is in latitude 31 degrees 53 minutes and
longitude 115 degrees. The source of the Grand River is in latitude 40
degrees 17' and longitude 105 degrees 43' approximately. The source of
the Green River is in latitude 43 degrees 15' and longitude 109 degrees
54' approximately.

The Green River is larger than the Grand and is the upper continuation
of the Colorado. Including this river, the whole length of the stream is
about 2,000 miles. The region of country drained by the Colorado and its
tributaries is about 800 miles in length and varies from 300 to 500
miles in width, containing about 300,000 square miles, an area larger