Kelly Barnes Dam
Template:Use American English Template:Use mdy dates Script error: No such module "Type in location".Script error: No such module "Infobox".Template:Template otherScript error: No such module "Check for unknown parameters".Expression error: Unexpected < operator. Kelly Barnes Dam was an earthen embankment dam on Toccoa Creek in Stephens County, Georgia, United States, just outside the city of Toccoa. Heavy rainfall caused it to collapse on November 6, 1977, and the resulting flood killed 39 people and caused $2.8 million in damage. The dam was never rebuilt.
A memorial to the dead stands downstream, by Toccoa Falls on the campus of Toccoa Falls College.
History
In 1899, a rock crib dam was built by E. P. Simpson on Tocco Creek to create a reservoir for a small hydroelectric power plant that began operating that same year. The plant, now a historical site on the Toccoa Falls College campus called the Old Toccoa Falls Power Plant, produced 200 kW for the town of Toccoa, Georgia.[1] The power plant was transferred in 1933 to the Toccoa Falls Institute, which decided to develop a more stable electric power source and built an earthen embankment dam over the original rock crib dam between 1939 and 1940.[2] After World War II, the dam was again raised, creating Barnes Lake, a Script error: No such module "convert". reservoir. The modifications provided power for Toccoa Falls Institute until 1957, when the power production was stopped, and the lake was thereafter used only for recreation.[3]
Dam characteristics
The dam was modified several times, ultimately measuring Script error: No such module "convert". high, Script error: No such module "convert". long and Script error: No such module "convert". wide at its crest. The dam had two uncontrolled earthen spillways. The main spillway was Script error: No such module "convert". long, Script error: No such module "convert". wide and located on the left side of the structure. A low point on the right side and away from the dam could also be used as a secondary spillway when the reservoir levels became too high.[4]
The embankment dam was located about Script error: No such module "convert". upstream from the Toccoa Falls and mostly consisted of residual soils and silt. The dam sat on a foundation of silt and stable biotite gneiss (rock).[5]
Within the dam embankment were two masonry structures. One helped support a pipe that was used as a low-level spillway. The other contained a penstock (pipe) for the hydroelectricity power plant. Neither was being used at the time of the flood.[6]
Dam failure
On November 6, 1977,[7] at 1:30 am, the Kelly Barnes Dam failed after four days of heavy rain:[8] Script error: No such module "convert". had fallen from November 2 to 5—half of that between 6 pm and midnight on November 5. The rain swelled Barnes Lake, which normally held Script error: No such module "convert". of water, to an estimated Script error: No such module "convert". of water.
A total of Script error: No such module "convert". of the dam failed, causing a peak of Script error: No such module "convert". maximum discharge to burst downstream.[9]
The flood killed 39 people[6] and destroyed nine houses, 18 mobile homes, two college buildings and many motor vehicles. Five houses and five college buildings were also damaged. Two bridges on Toccoa Falls Drive and a culvert at County Farm Road were completely destroyed. The embankments at Georgia State Route 17 were destroyed on either side of the bridge, and one of the bridge abutments at Highview Road was destroyed. The water-supply pipe for the city of Toccoa was damaged and the city's water supply was contaminated for several days.[10] The cost of the damage was $2.8 million.[11]
After the flood, Georgia's Governor George Busbee called for an immediate investigation, which was carried out by a Federal Investigative Board of the United States Geological Survey. Their report was released December 21, 1977, with no specific causes cited for the failure.[6] The investigators had no engineering plans for the dam and records of construction on the dam were based on witnesses, pictures, and newspaper articles.[6]
The investigation did, however, cite several possible or probable causes. The failure of the dam's slope may have contributed to weakness in the structure, particularly in the heavy rain. A collapse of the low-level spillway could have also exacerbated this problem. A 1973 photo showed a Script error: No such module "convert"., Script error: No such module "convert". slide had occurred on the downstream face of the dam, which may have also contributed or foreshadowed the dam failure. Overall, the dam itself was in poor condition and lacked a sufficient design.[6]
See also
References
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- ↑ Script error: No such module "citation/CS1".
- ↑ Script error: No such module "citation/CS1".
- ↑ Report of Failure of Kelly Barnes Dam and Findings – History
- ↑ Report of Failure of Kelly Barnes Dam and Findings – General
- ↑ Report of Failure of Kelly Barnes Dam and Findings – Site Geology
- ↑ a b c d e Report of Failure of Kelly Barnes Dam and Findings – Conclusion
- ↑ Script error: No such module "citation/CS1".
- ↑ Script error: No such module "Citation/CS1".
- ↑ Report of Failure of Kelly Barnes Dam and Findings – Authority
- ↑ Kelly Barnes Dam Flood of November 6, 1977, near Toccoa, Georgia – Flood Damage
- ↑ Script error: No such module "Citation/CS1".
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Further reading
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External links
- Toccoa Falls College Toccoa Falls College Dam Break Memorial Page
- USGS Report USGS Report on the Kelly Barnes Dam Failure (Template:Webarchive)
- WSB-TV video Wilkerson Examines the Wreckage of the Toccoa Flood, Nov. 9, 1977. Walter J. Brown Media Archives and Peabody Awards Collection, University of Georgia Libraries. Web. 5 June 2016.
- WSB-TV video Residents of Toccoa Falls Explain How They Survived the Flood, Nov. 6, 1978. Walter J. Brown Media Archives and Peabody Awards Collection, University of Georgia Libraries. Web. 5 June 2016.
- WSB-TV video Memorial Service Is Held for Toccoa Falls College Students Who Were Killed in the Flood, Nov. 9, 1977. Walter J. Brown Media Archives and Peabody Awards Collection, University of Georgia Libraries. Web. 5 June 2016.
- Toccoa Falls Power Plant Toccoa Falls Power Plant historical marker
- Pages with script errors
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- Disasters in Georgia (U.S. state)
- Failed dams in the United States
- 1977 disasters in the United States
- Buildings and structures in Stephens County, Georgia
- 1977 in Georgia (U.S. state)
- Dams in Georgia (U.S. state)
- United States privately owned dams
- November 1977 in the United States
- Toccoa Falls College
- 1899 establishments in Georgia (U.S. state)
- 1977 disestablishments in Georgia (U.S. state)