Colorado
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Larimer
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May 25, 1951
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Dam Failure, Flood
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"Larimer County, Lilly Lake Dam, 1951: The earliest recorded dam failure flood in the Estes Park region occurred on May 25, 1951, when Lilly Lake Dam failed, sending flood waters down Fish Creek and into Lake Estes." - CO Hazard Mitigation Plan 2018-2023
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Colorado
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Prowers
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June 01, 1965
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Dam Failure, Flood
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"Prowers County, Clay Creek, 1965: In June 1965, a flood occurred on Clay Creek in Prowers County, which overtopped an earthen dam being constructed by the Colorado Game, Fish, and Parks Commission. Although the dam did not fail, it did divert floodwater into an adjacent drainage. The subsequent damage and death from this flood resulted in an important legal controversy known as the Barr Case. This case was finally decided in 1972 by the Colorado Supreme Court, which recognized the concept of probable maximum flood as a predictable and foreseeable standard for spillway design purposes." - CO Hazard Mitigation Plan 2018-2023
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Colorado
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Weld
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January 01, 1973
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Dam Failure, Flood
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"Weld County, Lower Latham Reservoir Dam, 1973: The failure of the Lower Latham Reservoir Dam in 1973 and subsequent flooding in the Town of Kersey, resulted in a Presidential Major Disaster Declaration." - CO Hazard Mitigation Plan 2018-2023
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Colorado
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Delta
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May 02, 1998
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Dam Failure, Flood
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"Delta County, Carl Smith Reservoir, 1998: The Carl Smith Reservoir failed on the evening of May 2, 1998. Carl Smith Dam is an 850-acre foot, Class 1 off-channel reservoir in Leroux Creek Basin north of Hotchkiss, Colorado. The failure was a result of a large slide on the downstream slope that extended across the crest and into the upstream slope. The releasing water swiftly eroded down through the top half of the remaining embankment and quickly released about 500 acre-feet of storage. The peak discharge just below the dam was determined to be around 3,300 cfs. Several residences were evacuated. The only loss of life was livestock. The high water washed out numerous bridges, and diversion structures were quickly rebuilt to restore water to irrigators." - CO Hazard Mitigation Plan 2018-2023
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Colorado
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Otero
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La Junta
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May 01, 1999
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Dam Failure, Flood
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"Dikes North of La Junta, Otero County, 1999: A three-day rainfall event occurred on April 29 to May 1, 1999. Heavy rain and saturated soil caused flooding in two major areas along the Front Range, specifically in Northeastern Colorado along the South Platte River and some of its tributaries, and Southeastern Colorado along the Arkansas River and some of its tributaries. Rainfall totals of up to 13 inches were recorded in the Cheyenne Mountain region of Colorado Springs. The La Junta region recorded approximately 8 inches over the same three-day period. The Arkansas River broke the dikes near North La Junta, flooding approximately 200 residences and businesses. The stormwater runoff from the three-day general rain resulted in large flood inundation and erosion in the Arkansas River and Fountain Creek watersheds." - CO Hazard Mitigation Plan 2018-2023
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Colorado
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La Plata
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October 06, 2006
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Dam Failure, Flood
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"La Plata County Levees and Dikes, 2006: In 2006, La Plata County experienced prolonged and heavy rainfall over October 5 and 6. Vallecito Creek overflowed, resulting in flash flooding. Levees and dikes built in the 1970s along the Creek breached on the night of October 6." - CO Hazard Mitigation Plan 2018-2023
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Colorado
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Pueblo
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Pueblo
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May 07, 2007
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Dam Failure, Flood
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"Embankment North of Pueblo, Pueblo County, 2007: The area north of Pueblo was inundated by heavy rainfall in early May 2007. On the morning of May 7, an earthen embankment along Fountain Creek failed and 15 structures were flooded. The flooding was not a result of overtopping, but rather structural failure. This embankment was not a certified levee and was not identified on the effective FIRM." - CO Hazard Mitigation Plan 2018-2023
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Colorado
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Weld
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Evans
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September 09, 2013
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Dam Failure, Flood
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"Riverside Park Levee, Evans, Weld County, 2013: The Riverside Park levee failed in Evans during the September 2013 flooding. The floodwaters created a 70-foot gap in the levee. The flood put the sewage treatment plant out of operation, leaving residents unable to shower or flush their toilets for over a week." - CO Hazard Mitigation Plan 2018-2023
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Colorado
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Morgan, Washington
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June 15, 2015
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Dam Failure, Flood
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"Morgan and Washington Counties Levee Breach, 2015: On June 15, 2015, a levee breach, about 100 yards wide along the South Platte River, produced farmland flooding over northeast Morgan and northwest Washington Counties. Floodwaters, three to four feet deep, washed out the Union Pacific railroad tracks southwest of Messex. Up to ten inches of water covered several miles of track. Approximately 30 trains per day had to be diverted until the tracks could be repaired and inspected. Washington County Road 58.3 was also washed out." - CO Hazard Mitigation Plan 2018-2023
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Wyoming
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Natrona
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Casper
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March 01, 1906
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Dam Failure, Flood
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12
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"On March 1, 1906, flooding along the North Platte River near Casper resulting from snow/ice melt caused a diversion dam to fail. A stream returned to its natural channel with a culvert too small to handle the flood, causing the water to rise against a railroad embankment. The embankment failed. Twelve were killed in a train wreck when the railroad bridge was damaged." - WY Hazard Mitigation Plan 2021-2026
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