1. Teton Dam The Collapse and Disaster. Names TE 335

2. –Located in 3miles northwest of Newdale, Idaho Building began in Feb 1972 and was completed in Nov. 1975 305-foot-high Legnth of 3100 ft including spillway Crest elevation of 5332ft Total impoundment capacity 288250 acre-feet, active capacit of 200k acre feet (Karl Terzaghi) (Arthur Casagrande) 11 lives lost 100 Million dollar to build 300 Million Dollars of claims

3. Water began seeping from canyon wall about 750 feet down stream from the dam on Thursday. By early Saturday, June 5 th 1976, a new leak had appeared near the abutment. By 9:30 a.m. this leak had begun. Four bulldozers were sent in to try and plug the leak. It continued to grow. At area residents were already calling and going door to door warning families who lived just below the dam to get out fast. Around 11:00 a.m. a whirlpool was spotted in the water above the dam. hole on the downstream side had grown to more than 25 feet in diameter. Bulldozers got stuck. and were swallowed by the hole. The operators were pulled free with ropes that had been tied around their waists. By evening, the reservoir had drained completely.

4. Cause of Failire -Dam fill inadequately campacted, too dry. (brittle) - Fracturd bedrock abundments (less support) -Excessive reliance on grout barrier -Piping: Erosion of tunnels by leaking water

17. Possible Solutions: Use less brittle material. More pressure flexibility. Secure abuntments. Don’t rely on grout connections and barriers. Better placement of pipes for less or no erosion. Take to account the “pre-breakage” leaks that might lead to dam eruption. Better evacuation efforts.

18. http://washington-state- magazine.wsu.edu/stories/2004/August/tetondam.htmlhttp://washington-state- magazine.wsu.edu/stories/2004/August/tetondam.html http://web.umr.edu/~rogersda/teton_dam/ http://www.geol.ucsb.edu/faculty/sylvester/Teton%20Dam/welcome_ dam.htmlhttp://www.geol.ucsb.edu/faculty/sylvester/Teton%20Dam/welcome_ dam.html http://www.eng.uab.edu/cee/faculty/ndelatte/case_studies_project/T eton%20Dam.htmhttp://www.eng.uab.edu/cee/faculty/ndelatte/case_studies_project/T eton%20Dam.htm http://www.rootsweb.com/~idfremon/flood.htm