Reservoirs
Reservoirs
Storage vs the historical normal for major western reservoirs.
Updated Jul 8, 2026
Elephant Butte Reservoir storage
Reservoir storage in Rio Grande basin, New Mexico
-59% vs 5-yr
Blue Mesa Reservoir storage
Reservoir storage in Gunnison-Colorado basin, Colorado
-51% vs 5-yr
Lake Powell storage
Reservoir storage in Colorado (Upper) basin, Arizona / Utah
-33% vs 5-yr
Boysen Reservoir storage
Reservoir storage in Wind-Bighorn-Missouri basin, Wyoming
-24% vs 5-yr
Navajo Reservoir storage
Reservoir storage in San Juan-Colorado basin, New Mexico / Colorado
-14% vs 5-yr
Flaming Gorge Reservoir storage
Reservoir storage in Green-Colorado basin, Utah / Wyoming
-14% vs 5-yr
Lake Mead storage
Reservoir storage in Colorado (Lower) basin, Nevada / Arizona
-12% vs 5-yr
Fontenelle Reservoir storage
Reservoir storage in Green-Colorado basin, Wyoming
-9% vs 5-yr
Canyon Ferry Lake storage
Reservoir storage in Missouri basin, Montana
-9% vs 5-yr
Lake Havasu storage
Reservoir storage in Colorado (Lower) basin, Arizona / California
-8% vs 5-yr
New Melones Lake storage
Reservoir storage in San Joaquin basin, California
-7% vs 5-yr
Shasta Lake storage
Reservoir storage in Sacramento basin, California
-6% vs 5-yr
Millerton Lake storage
Reservoir storage in San Joaquin basin, California
-5% vs 5-yr
Hungry Horse Reservoir storage
Reservoir storage in Flathead-Columbia basin, Montana
+1% vs 5-yr
Whiskeytown Lake storage
Reservoir storage in Sacramento basin, California
+1% vs 5-yr
Lake Mohave storage
Reservoir storage in Colorado (Lower) basin, Nevada / Arizona
+4% vs 5-yr
Folsom Lake storage
Reservoir storage in American-Sacramento basin, California
+6% vs 5-yr
Trinity Lake storage
Reservoir storage in Trinity-Klamath basin, California
+39% vs 5-yr