San Juan River

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SAN JUAN RIVER BASIN

SAN JUAN RIVER BASIN

Drainage Area: ~ 26,000 square miles of Colorado, New Mexico, and Arizona before merging with Lake Powell and the Colorado River system in Utah. Major tributaries include San Miguel River, Animas River, and La Plata River.

 

Length : The San Juan River is the second longest (or largest??) tributary to the Colorado River. Its source is on the Continental Divide in southern Colorado. It flows approximately 350 miles west to its confluence with Lake Powell.

 

Largest cities/towns in the basin:

  • Farmington, NM
  • Durango, CO

 

Elevation: Ranges from greater than 14,000 ft. in the San Juan Range and headwaters of Animas and Los Pinos Rivers to 4,500 ft. as Mancos River exits the state of Colorado, east of the Four Corners and  ~ 3,700 ft at the confluence with Lake Powell.

 

Land use: Agricultural, mining, recreation, tourism (??)

Storage-Major reservoirs:

  • McPhee Reservoir – 381,100 ac-ft
  • Vallecito Reservoir- 129,700
  • Lemon Reservoir – 40,100

 

Major Exports from Basin:

  • San Juan-Chama Project – 89,832 ac-ft

 

Source: San Juan/Dolores River Facts

 

Federal Offices

EVENTS TIMELINE

  • 1902 RECLAMATION ACT
  • 1920 KINKAID ACT Starts the wheels turning for construction of Hoover Dam.
  • 1922 COLORADO RIVER COMPACT
  • 1922 STATE OF WYOMING - v - STATE OF CO
  • 1928 Boulder Canyon Project Act
  • 1931 Boulder Canyon Project Agreement
  • 1944 Mexican Water Treaty
  • 1948 Upper Colorado River Basin Compact
  • 1956 Colorado River Storage Project Act
  • 1962 Navajo Indian Irrigation Project
  • 1968 Colorado River Basin Project Act
  • 1974 Colorado River Basin Salinity Control Act
  • 2001 Colorado River Interim Surplus Guidelines
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