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Runoff patterns across the Colorado River Basin reflect this; most of the perennial tributaries originate in the Upper Basin, while tributaries in the Lower Basin are either ephemeral (such as the Little Colorado River) or highly seasonal (such as the Gila and Salt rivers). [57]
The river's first diversion is here at its headwater. The Grand Ditch redirects water from the Never Summer Mountains, which would have flowed into the Colorado River, to instead flow across the divide through La Poudre Pass to irrigate farmland to the east. Near the source of the Colorado River in Rocky Mountain National Park, Colorado
Map of the Colorado River drainage basin The principal tributaries of the Colorado River of North America are the Gila River , the San Juan River , the Green River , and the Gunnison River . Tributary tree
The Colorado runs 1,450 mi (2,330 km) from the Rocky Mountains to the Gulf of California, draining parts of seven U.S. states and two Mexican states. The river system is one of the most heavily developed in the world, with fifteen dams on the main stem of the Colorado [citation needed] and hundreds more on tributaries.
Scientists estimate that Colorado River flows have decreased by about 20% compared to the early 20th century. A recent UCLA study found that in just the last two decades, ...
"Six out the seven states within the Colorado River Compact rank in the top 10 of most water stressed states in the United States." The Atlas finds that across the globe, 25 countries experience ...
At least 13 lava dams blocked the Colorado River, forming lakes that were up to 2,000 feet (610 m) deep. The end of the last ice age and subsequent human activity has greatly reduced the ability of the Colorado River to excavate the canyon. Dams in particular have upset patterns of sediment transport and deposition.
The river’s condition has improved somewhat with wetter winters since 2023. But Lake Mead remains just 33% full, while the second-largest reservoir, Lake Powell, is now at 39% of capacity.