ROANOKE COUNTY


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Roanoke County, Virginia

Area: 251 square miles
Population: 85,778 (2000 census)
Persons/Sq. Mile: 341.7
(Highest Density in SW Virginia)

% Karst Terrane: approx. 20%

Major Karst Development Areas:
Roanoke Valley
Minor Valleys

Karstic Formations and Map Symbols:
Helderberg - DSu
Undivided Ordovician - Ou

Number of Reported Caves: 81
Surveyed Cave Passage: 5 miles

Longest Cave: 13,200 feet
Average Length: 337 feet

Deepest Cave: 350 feet