Reservoir Facts

Loch-RavenLoch Raven Reservoir

  • Elevation above mean sea level 240 feet
  • Spillway length 288 feet
  • Total length 650 feet
  • Height of crest above stream bed 82 feet
  • Length of shoreline at crest elevation 50 miles
  • Area of land owned 8,000 acres
  • Flooded area at crest elevation 2,400 acres
  • Initial storage capacity: 23 billion gallons
  • Water surface: 2,400 acres
  • Crest elevation: 240 feet above mean sea level
  • Area of the watershed: 233 square miles
  • Built 1912 – 1914 (elevation 188 feet)
  • Crest raised 52 feet: 1921 – 1922 (elevation 240 feet)
  • Overflowed crest for the first time: May 1923

Liberty DamLiberty Reservoir

  • Elevation above mean sea level 420 feet
  • Spillway length 480 feet
  • Total length 704 feet
  • Height of crest above stream bed 160 feet
  • Length of shoreline at crest elevation 82 miles
  • Area of land owned 9,200 acres
  • Flooded area at crest elevation 3,100 acres
  • Initial storage capacity: 43 billion gallons
  • Crest elevation: 420 feet above mean sea level
  • Area of the watershed: 164 square miles
  • Built: 1951 – 1954
  • Overflowed crest for the first time on February 6, 1956

Prettyboy DamPretty Boy Reservoir

  • Elevation above mean sea level 520 feet
  • Spillway length 274 feet
  • Total length 845 feet
  • Height of crest above stream bed 130 feet
  • Length of shoreline at crest elevation 46 miles
  • Area of land owned 7,380 acres
  • Flooded area at crest elevation 1,500 acres
  • Initial storage capacity: 20 billion gallons
  • Crest elevation: 520 feet above mean sea level
  • Area of the watershed: 80 square miles
  • Construction completed: 1933
  • Overflowed crest for the first time September 23, 1933