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of 21.66 ft (6.60 m). However, the stream flow at the time was 1,400 cu ft/s (40 m/s) less than the 2004 record peak stream flow of 26,000 cu ft/s (740 m/s). Only two of the dam's three spillway gates were fully open. Water eventually overtopped the dam, causing a 200 ft (61 m) long portion of the embankment and roadway to erode away and the lake to empty. Around 8,000 people in downstream areas like
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problem with the dam's design. The embankment was constructed in such a way that its fill did not settle correctly. Within the embankment section, a concrete wall, designed to reinforce it, was not constructed up to the height of the dam's crest. That sped up internal erosion and allowed the water to over-top the dam.
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The southern embankment of the Delhi Dam failed on July 24, due to a period of about 10 inches (250 mm) of rainfall in twelve hours. Before the breach, river levels upstream of the dam had reached 24.22 ft (7.38 m), 10 feet (3 m) above flood stage and breaking the May 2004 record
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In
December 2010, an independent panel of engineers published a study that determined the cause of the failure "was internal erosion in the embankment coupled with overtopping flow". The study believes that a malfunctioning spillway gate and increase reservoir size may have exacerbated an existing
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In April, 2014, ground was broken on a $ 16 million project to replace the failed Delhi Dam embankment and spillway. Completion of the project was scheduled for
October, 2015. Of the cost, the state contributed $ 5 million, the county $ 3 million and the balance from assessments against the local
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had to be evacuated. The breach caused damage estimated in the millions of dollars thus far. In
Monticello, 50 homes and 20 businesses received major flood damage among other damaged structures. The city's sewage treatment plant was also flooded, leaving residents without sewer services. Property
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power production, but its generators ceased operating in 1973 shortly before the Lake Delhi
Recreation Association took ownership. Since then, it has been used for recreation. Several floods in 2008 caused an estimated $ 500,000 in damages to the dam and its floodgates. In October 2008, the
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with a 1.5 MW capacity able to produce 3 GWh of electricity annually for sale to the local power utility. $ 1.5 million in funding was sought by the Iowa Power Fund and power production was expected as early as 2010. The dam was cited for minor problems during a 2009
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By March 2012, $ 1.7 million in donations was collected to replace the dam and $ 9 million in local and county bonds was approved. $ 5 million in state funding was then requested for repairs as well. The cost at that time was estimated around $ 12 million.
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owners that live near the lake pay special taxes to have the Lake Delhi
Recreation Association (LDRA) maintain it, and replacement of the dam is uncertain, as the LDRA is in debt from previous lake-dredging costs.
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that created Lake Delhi. The dam was over-topped and subsequently failed on July 24, 2010 after a period of heavy rain. It was rebuilt in 2016.
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The dam and lake are part of the Turtle Creek
Recreation Area, and is owned by a local community group.
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745:"Flooding from eastern Iowa river causes millions in damage in Monticello, engulfs sewer plant"
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675:"Streamflow Measurements for the Nation USGS 05416900 Maquoketa River at Manchester, IA"
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property owners. In
September 2016 the river level was back to pre-flood stage levels.
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Fiedler, William; Wayne King; Neil
Schwanz; Jonathan Garton; Lori McDaniel.
697:"Peak Streamflow for Iowa – USGS 05416900 Maquoketa River at Manchester, IA"
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The dam was built between 1922 and 1929 by the
Interstate Power Company for
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817:"Delaware Supervisors proceed with $ 3 million bond for Lake Delhi Dam"
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U.S. Geological Survey
Geographic Names Information System: Delhi Dam
631:"Will dam failure be end of Lake Delhi? Culver might seek FEMA aid"
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Association signed a partnership with Modern Hydro to have the
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720:"Engineers say floodgate is suspect in Delhi dam failure"
653:"Dam fails in eastern Iowa, causing massive flooding"
510:"Ownership switch to aid Delhi dam rebuilding effort"
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915:Buildings and structures in Delaware County, Iowa
578:. iStockAnalyst. November 8, 2008. Archived from
677:. United States Geological Survey. July 24, 2010
875:Overhead video of Delhi Dam before full breach
794:"Dam Safety: What Happened to Lake Delhi Dam?"
880:Overhead video of Delhi Dam after full breach
526:. TH Online. October 11, 2008. Archived from
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551:"Delhi dam was old but well-kept, DNR says"
208:704 ft (215 m) (Concrete section)
474:"Delhi Dam – Dam Safety Inspection Report"
346:2.5 kilometres (1.6 mi) southwest of
62:Location of Delhi Dam in the United States
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576:"Lake Delhi Dam May Yield Power By 2010"
843:"Lake Delhi getting closer to a refill"
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224:32,000 cu ft/s (910 m/s)
767:"Iowa dam fails, threatens Iowa towns"
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524:"Iowa: Owners look to reactivate dam"
245:3,790 acre⋅ft (4,670,000 m)
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633:. Des Moines Register. July 25, 2010
380:Iowa Department of Natural Resources
841:Danielson, Dar (January 30, 2015).
192:Embankment, concrete outlet section
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905:Dam failures in the United States
870:Lake Delhi Recreation Association
699:. United States Geological Survey
323:Lake Delhi Recreation Association
255:347 sq mi (900 km)
177:Lake Delhi Recreation Association
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472:Allen, Dave (August 17, 2009).
35:The dam after it failed in 2010
925:2010 disestablishments in Iowa
815:Murphy, Erin (March 5, 2012).
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216:Service, gate-controlled ogee
65:Show map of the United States
747:. Fox News/AP. July 25, 2010
718:Leys, Tony (July 29, 2010).
549:Leys, Tony (July 25, 2010).
920:1929 establishments in Iowa
453:. Iowa Whitewater Coalition
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263:218 ha (2.18 km)
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271:896 ft (273 m)
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308:Installed capacity
158:Construction began
18:Dam in near Delhi, Iowa
289:Decommission date
221:Spillway capacity
200:59 ft (18 m)
553:. Des Moines Register
268:Normal elevation
188:Type of dam
142:42.40778°N 91.34528°W
722:. DesMoines Register
655:. CNN. July 24, 2010
281:Commission date
530:on October 16, 2008
382:safety inspection.
251:Catchment area
242:Total capacity
147:42.40778; -91.34528
138: /
895:Reservoirs in Iowa
602:"Federal Register"
213:Spillway type
910:Disasters in Iowa
611:. August 26, 2008
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312:1.5 MW (Proposed)
260:Surface area
182:Dam and spillways
166:Opening date
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93:Show map of Iowa
90:Delhi Dam (Iowa)
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900:Dams in Iowa
850:. Retrieved
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798:. Retrieved
796:. HydroWorld
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580:the original
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386:2010 failure
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336:Hartwick Dam
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451:"Delhi Dam"
427:Dam failure
368:power plant
348:Delhi, Iowa
145: /
121:Coordinates
115:Delhi, Iowa
889:Categories
847:Radio Iowa
703:August 31,
681:August 31,
483:August 30,
438:References
397:Monticello
375:generators
237:Lake Delhi
133:91°20′43″W
130:42°24′28″N
852:March 12,
826:March 23,
800:March 23,
393:Hopkinton
332:Delhi Dam
229:Reservoir
24:Delhi Dam
821:THonline
777:July 24,
771:NBC News
751:July 26,
726:July 29,
659:July 31,
637:July 26,
615:July 26,
586:July 26,
557:July 26,
534:July 26,
457:July 26,
421:See also
338:, is an
298:Turbines
174:Owner(s)
103:Location
372:turbine
357:History
342:on the
318:Website
234:Creates
113:, near
479:. Iowa
205:Length
197:Height
605:(PDF)
477:(PDF)
854:2015
828:2012
802:2012
779:2010
753:2010
728:2010
705:2010
683:2010
661:2010
639:2010
617:2010
588:2010
559:2010
536:2010
485:2010
459:2010
395:and
292:1968
284:1929
169:1929
161:1922
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