Jefferson County - East-West Gateway Coordinating Council

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110 TABLE J50 JEFFERSON COUNTY HIGH HAZARD DAMS DAM NAME RECEIVING RIVER BUILT LENGTH Jefferson County – Section 2 DAM HEIGHT VOLUME STATE REGULATED Creek Pine Lake Dam Tr-Rock Creek 1961 0 33 77 N Weber Hill Terrace Lake Dam Tr-Bear Creek 1957 519 36 117 Y Land Of Lakes Dam Tr-Bear Creek 1946 0 30 26 N Tamarack Dam Tr-Sand Creek 1964 0 29 141 N Little Lake Dam Tr to Joachim Creek 1961 0 32 24 N Sunrise Big Lake Dam Tr to Joachim Creek 1961 480 38 97 Y Summer Set Lake Dam Falling Rock Branch Deerwood Lake No.3 1974 1200 59 1336 Y Dam Bequette Dam - Trib-Isom Creek 1960 0 25 30 N Noname 262 Tr-Isum Creek Tributary to La Barque 1967 0 31 31 N Glenwilfern Lake Dam Creek 1953 540 38 93 Y Cedar Hill Lake No. 3 Tributary to Dam Skullbones Creek 1949 0 28 60 N Fisherman's Lake Dam Tr Ball Branch 1970 0 34 167 N Dresser No. 10 Dam Tr Big River 1974 765 100 1118 Y Atwood Lake Dam Sunrise Lake Upper Tr to Sandy Creek 1969 0 27 43 N Dam Winter Haven Lake Tr to Joachim Creek 1961 360 37 175 Y Dam Falling Rock Branch 1978 730 49 224 Y Spring Lake Dam Tr-Falling Rock Branch 1976 600 42 133 Y Siesta Lake Dam Tr to Fritz Creek 1957 0 30 58 N Gwenmil Lake Dam Tr to Isum Creek 1957 0 29 23 N Francois Lake Dam Tr to Mississippi River 1979 470 38 19 Y Highway 21 Lake Dam Trib-Heads Creek 1940 0 28 47 N Dresser No. 11 Tr to Big River 1975 500 90 50 Y Silver Lake Dam Ditch Creek 1981 1600 80 0 Y Raintree Dam #2 Belew Creek Tributary 1989 1000 55 988 Y Stonehenge #1 Dam Trib to Sugar Creek 1990 360 41 13 Y Brian Haskins Lake Dam 1990 0 22 0 N Ralph McNail Lake Dam 1988 0 24 0 N Source: Missouri Department of Natural Resources Type of Damage When dams fail, the results can be catastrophic. Dams are innately hazardous structures. Failure or disoperation can result in the release of the reservoir contents--this includes water, mine wastes or agricultural refuse--causing negative impacts upstream or downstream or at locations remote from the dam. Negative impacts of primary concern
A Regional Overview All-Hazard Mitigation Plan 111 are loss of human life, economic loss including property damage, lifeline disruption and environmental damage. While the definition varies from place to place, it generally means if failure of a high-hazard dam occurs, there probably will be loss of life. I t must be emphasized that this determination does not mean that these dams are in need of repair--these dams could be in excellent condition or they could be in poor condition. "High-hazard" just reflects the dam's potential for doing damage downstream should it fail. High-hazard potential dams exist in every state and affect the lives of thousands downstream. The current issue and debate is over the increasing number of these highhazard structures--not because more high-hazard dams are being built, but that more development is occurring downstream. Dam and reservoir safety regulators generally have no control over local zoning issues or developers' property rights. So this issue continues to worry regulators as the trend persists. Some dams are considered to have a greater hazard potential than others. There are approximately 10,000 state-regulated "high-hazard" potential dams in the U.S. "Highhazard" is a term used by a majority of state dam safety programs and federal agencies as part of a three-pronged classification system used to determine how hazardous a dam's failure might be to the downstream area. Historically, dams that failed had some deficiency, as characterized above, which caused the failure. These dams are typically termed "unsafe." Currently, there are about 2,000 "unsafe" dams in the U.S. There are unsafe dams in almost every state. (A majority of states and federal agencies define an "unsafe" dam as one that has been found to have deficiencies that leave it more susceptible to failure.) Hazard Event History Thousands of people have been injured, many killed, and billions of dollars of property damaged by dam failures in the United States. Dam failures at Lawrenceton in 1968, Washington County in 1975, Fredericktown in 1977, and a near failure in Franklin County underscored the problem of unsafe dams in Missouri in 1978. Frequency of Occurrence Table F51 below summarized the frequency of dam failures in Missouri. Four dams failed in ten years. TABLE J51 RECENT DAM FAILURES IN MISSOURI Community Date Lawrenceton 1968 Washington County 1975 Frederickton 1977 Franklin County (near failure) 1978
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8 Federal Sources TITLE: PRE-DISAST
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12 TITLE: SOIL AND WATER CONSERVATI
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4 The mitigation goals include the
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16 1,2,3,4,5,6,7,8,9, Revise flood-
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18 Encourage development of jurisdi
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Jefferson County - East-West Gateway Coordinating Council

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