Colorado River — water-availability stoplight map

Main stem flows top to bottom (headwaters → Gulf of California). Tributaries branch left and right at their confluences.

Indicative first-pass · figures early-to-mid June 2026 (Blue Mesa, Navajo & SRP figures late April 2026)

Read before using
Red — much below normal / critical
Yellow — below normal / watch
Green — normal or better
Gray — no usable data / n/a
Confluence
Headwaters
La Poudre Pass, Rocky Mountains, CO
Shadow Mountain Dam
Shadow Mountain Lake
Gray · not scored
Granby Dam
Lake Granby
Gray · not scored
Windy Gap Dam
Gray · diversion
Upper Colorado tribs
Front Range water supply
Dillon Dam
Blue River
Green Mountain Dam
Blue River
Williams Fork Dam
Williams Fork R.
Wolford Mtn Dam
Muddy Creek
Ruedi Dam
Fryingpan River
Grand Valley Diversion
Price–Stubb Dam (non-operational since 1919)
Gray · diversions
Gunnison River
joins at Grand Junction, CO
Blue Mesa Dam
Aspinall Unit
~47% full · Apr 2026
Morrow Point Dam
Aspinall · regulating
Crystal Dam
Aspinall · regulating
Ridgway Dam
Uncompahgre River
Taylor Park Dam
Taylor River
Dolores River
joins in eastern Utah
McPhee Dam
Green River
largest tributary · Canyonlands, UT
Fontenelle Dam
Flaming Gorge Dam
~70% cap · low inflows · Jun 2026
Soldier Creek Dam
Strawberry River
Starvation Dam
Duchesne River
Scofield Dam
Price River
Joes Valley Dam
San Rafael basin
Yampa & White rivers — free-flowing
San Juan River
joins into Lake Powell
Navajo Dam
~63% full · Apr 2026
Ridges Basin Dam
Animas R. · off-stream
Vallecito Dam
Los Pinos River
Lemon Dam
Florida R. → Animas R.
Glen Canyon Dam
Lake Powell · min power 3,490 ft · dead pool 3,370 ft
Red · ~23.5% cap · ~3,528 ft · near 2023 record low
Little Colorado River
joins in the Grand Canyon
No major dams — free-flowing
Virgin River
joins into Lake Mead
No major main-stem dam
(Sand Hollow is off-stream)
Las Vegas Wash
joins into Lake Mead · Nevada (west bank)
No storage dam — erosion-control weirs only;
carries ~200 MGD treated wastewater returns
from Las Vegas Valley
Hoover Dam
Lake Mead · ~153 ft above dead pool
Red · ~29% cap · ~1,048 ft · near 2022 record low
Davis Dam
Lake Mohave · regulating reservoir
Green · ~72% cap · Jun 2026 (approx)
Bill Williams River
joins into Lake Havasu
Alamo Dam
flood control · not scored
Parker Dam
Lake Havasu · kept full for CAP/MWD
Green · ~85% cap · Jun 2026 (approx)
Headgate Rock Dam
Gray · diversion
Palo Verde Diversion Dam
Gray · diversion
Imperial Dam
Gray · diversion
Laguna Diversion Dam
Gray · diversion
Gila River
joins near Yuma, AZ
Coolidge Dam
Gila River
Painted Rock Dam
Gila R. · flood control
Theodore Roosevelt Dam
Salt R. · SRP
SRP system ~55% · Apr 2026
Horse Mesa Dam
Salt R. · SRP
Mormon Flat Dam
Salt R. · SRP
Stewart Mountain Dam
Salt R. · SRP
Horseshoe Dam
Verde R. · SRP
Bartlett Dam
Verde R. · SRP
New Waddell Dam
Agua Fria R. · CAP
Morelos Dam
US–Mexico border · last dam on the river
Gray · diversion
Gulf of California
Sea of Cortez · river rarely reaches the sea
Sources (early–mid June 2026; some late Apr 2026): USBR Upper & Lower Colorado water operations and weekly hydrologic update; USBR Glen Canyon / Flaming Gorge operations pages; SRP Watershed Connection; public reservoir trackers. Tributary placement is schematic, not geographic: left — Upper Colorado tributaries, Green River, Virgin River; right — Gunnison, Dolores, San Juan, Little Colorado, Bill Williams, Gila.