{ "bbox":null, "type":"Feature", "geometry":{ "bbox":null, "type":"Point", "coordinates":[ -92.98062, 41.3692 ] }, "properties":{ "provider":"MVR", "code":"PELI4", "slug":"peli4", "elevation":687.0, "horizontal_datum":"", "vertical_datum":"NGVD29", "state":"IA", "kind":"PROJECT", "nearest_city":"Pella", "public_name":"Lake Red Rock Pool", "location_code":50017, "nsid":null, "aliases":{ "NIDID":"IA00013", "USGS Station Number":"05488100", "CWMS Legacy Naming":"PELI4", "CWMS Standard Naming":"PELI4" }, "timeseries":[ { "tsid":"PELI4.Stor.Inst.30Minutes.0.rev", "label":"Flood Storage", "base_parameter":"Stor", "parameter":"Stor", "unit":"ac-ft", "unit_long_name":"Acre-feet", "latest_time":"2026-08-25T21:00:00Z", "latest_value":180131.42, "delta24h":null, "sort_order":11, "results":null }, { "tsid":"PELI4.Stor.Inst.30Minutes.0.rev", "label":"Conservation Storage", "base_parameter":"Stor", "parameter":"Stor", "unit":"ac-ft", "unit_long_name":"Acre-feet", 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"label":"Outflow", "base_parameter":"Flow", "parameter":"Flow", "unit":"cfs", "unit_long_name":"Cubic feet per second", "latest_time":"2026-08-25T21:00:00Z", "latest_value":2919.25, "delta24h":null, "sort_order":7, "results":null } ], "name":"Lake Red Rock Pool", "hasResopsAverages":"true", "nidId":"IA00013", "nidid":"", "levels":[ { "slug":"elev.streambed", "label":"Streambed", "parameter":"Elev-Tail", "base_parameter":"Elev", "tsid":"PELI4.Elev-Tail.Inst.0.Streambed", "latest_value":705, "units":"ft", "units_long_name":"Feet", "type":"CONSTANT" }, { "slug":"elev.top of conservation", "label":"Top of Conservation", "parameter":"Elev-Tail", "base_parameter":"Elev", "tsid":"PELI4.Elev-Tail.Inst.0.Top of Conservation", "latest_value":742, "units":"ft", "units_long_name":"Feet", "type":"CONSTANT" }, { "slug":"elev.top of dam", "label":"Top of Dam", "parameter":"Elev-Tail", "base_parameter":"Elev", "tsid":"PELI4.Elev-Tail.Inst.0.Top of Dam", "latest_value":797, "units":"ft", "units_long_name":"Feet", "type":"CONSTANT" }, { "slug":"elev.top of exclusive flood control", "label":"Top of Exclusive Flood Control", "parameter":"Elev-Tail", "base_parameter":"Elev", "tsid":"PELI4.Elev-Tail.Inst.0.Top of Exclusive Flood Control", "latest_value":780, "units":"ft", "units_long_name":"Feet", "type":"CONSTANT" }, { "slug":"elev.top of flood", "label":"Top of Flood", "parameter":"Elev-Tail", "base_parameter":"Elev", "tsid":"PELI4.Elev-Tail.Inst.0.Top of Flood", "latest_value":780, "units":"ft", "units_long_name":"Feet", "type":"CONSTANT" }, { "slug":"stor.streambed", "label":"Streambed", "parameter":"Stor", "base_parameter":"Stor", "tsid":"PELI4.Stor.Inst.0.Streambed", "latest_value":0, "units":"ac-ft", "units_long_name":"Acre-feet", "type":"CONSTANT" }, { "slug":"stor.top of conservation", "label":"Top of Conservation", "parameter":"Stor", "base_parameter":"Stor", "tsid":"PELI4.Stor.Inst.0.Top of Conservation", "latest_value":189020, "units":"ac-ft", "units_long_name":"Acre-feet", "type":"CONSTANT" }, { "slug":"stor.top of dam", "label":"Top of Dam", "parameter":"Stor", "base_parameter":"Stor", "tsid":"PELI4.Stor.Inst.0.Top of Dam", "latest_value":2400000, "units":"ac-ft", "units_long_name":"Acre-feet", "type":"CONSTANT" }, { "slug":"stor.top of exclusive flood control", "label":"Top of Exclusive Flood Control", "parameter":"Stor", "base_parameter":"Stor", "tsid":"PELI4.Stor.Inst.0.Top of Exclusive Flood Control", "latest_value":1624970, "units":"ac-ft", "units_long_name":"Acre-feet", "type":"CONSTANT" }, { "slug":"stor.top of flood", "label":"Top of Flood", "parameter":"Stor", "base_parameter":"Stor", "tsid":"PELI4.Stor.Inst.0.Top of Flood", "latest_value":1624970, "units":"ac-ft", "units_long_name":"Acre-feet", "type":"CONSTANT" } ], "id":549870, "associatedStructuresCount":3, "conditionAssessDate":null, "conditionAssessDetail":null, "conditionAssessId":6, "damHeight":142, "damLength":6260, "distance":null, "drainageArea":12323, "eapId":1, "dsacAssignedDate":"2010-03-30T12:00:00.000Z", "eapMeetsGuidelinesId":1, "emergencyContactsUpdated":"2024-05-28T12:00:00.000Z", "eapLastRevDate":"2024-11-13T12:00:00.000Z", "enforcementAuthorityId":0, "federalId":"IA00013", "oldFederalId":"IA00013", "hazardId":4, "hydraulicHeight":104, "inspectionAuthorityId":0, "inspectionDate":"2022-04-18T12:00:00.000Z", "inspectionFrequency":1, "jurisdictionAuthorityId":0, "latitude":41.3696802960001, "lengthOfLocks":0, "secondaryLengthOfLocks":null, "longitude":-92.980579916, "maxDischarge":378000, "maxStorage":1624970, "nidHeight":142, "nidStorage":1624970, "normalStorage":189000, "numberOfLocks":0, "operationalStatusDate":"2010-03-30T12:00:00.000Z", "operationalStatusId":1, "originalDesignerName":null, "otherStructureId":null, "permittingAuthorityId":0, "politicalPartyId":null, "privateDamId":null, "projectDescription":"The U.S. Army Corps of Engineers (USACE) completed construction of Red Rock Dam in May 1959 for the purposes of flood risk management, water quality, recreation, and fish and wildlife management. A non-Federal hydropower facility was constructed at the dam and placed into service in 2020. Red Rock Dam is located on the Des Moines River about 4 miles southwest of the City of Pella, Iowa. The earthen dam is about 1.2 miles long with a maximum height of 110 feet. A concrete water control structure is located near the middle of the dam and provides the means for water to be released from the lake. Water can be released through the water control structure in three ways. The first is through the non-Federal hydropower facility with the capacity to release up to 10,200 cfs when the lake is between elevation 740 feet and 762 feet. The second is through a series of 14 sluice gates that can release up to 39,000 cfs when the lake is below elevation 770 feet. The third is through a series of 5 Tainter gates that can release more than 130,000 cfs when the lake is above elevation 770 feet. Red Rock Dam has prevented over $1.6 billion in flood damages and protects more than 27,000 people living and working in the area below the dam. The highest lake elevation observed was in 1993 and was just under 15 feet lower than the top of the dam with releases through the dam of 130,000 cubic feet per second.", "riskCharSummary":"USACE completed a risk assessment in April 2022 and classified the risk associated with Red Rock Dam as low. Water released from the dam would impact the cities and towns along the Des Moines River downstream of the dam to the Mississippi River in the extremely unlikely event of a dam failure. The dam was found to be well-designed, well-constructed, and well-maintained and is expected to be reliable during major floods. However, there is a very remote risk of dam failure from extremely high lake levels overtopping the dam or the dissolving of minerals beneath the dam\u2019s foundation leading to sinkholes. Although highly unlikely, a dam failure would produce a devastating flood with flood depths greater than 15 feet along the river through cities and towns such as Ottumwa and Keosauqua, Iowa to the confluence with the Mississippi River at Keokuk, Iowa. The flood would inundate the cities and towns within the floodplain along the Des Moines River and overtop levees along the Mississippi River south of Hannibal, Missouri. Approximately 27,000 people live or work within the worst-case inundation area of the flooding caused by a dam failure.", "riskManagementMeasures":"USACE works to reduce the risks posed to the community by Red Rock Dam. The dam\u2019s Emergency Action Plan is updated regularly, and the emergency notification charts are updated annually. This plan has been coordinated with state and local Emergency Management Agencies to help improve their dam incident response planning and preparedness responsibilities. Emergency exercises are routinely held with local and state emergency responders and stakeholders to enhance the local communities\u2019 response plan and evacuation procedures. Dam breach flood maps are available for public viewing on the National Inventory of Dams. USACE is developing a detailed communication plan based on the latest risk assessment findings and will engage in communication activities with state and local representatives, stakeholders, emergency managers, and the general public to increase awareness. The dam has a robust instrumentation and monitoring program that allows USACE staff to regularly monitor the dam\u2019s performance under changing lake levels. USACE operations and engineering staff routinely conducts detailed inspections of the dam during both normal and high lake levels to ensure the integrity of the dam, identify deficiencies, and monitor known deficiencies. The dam is well maintained through continuous operations and regular maintenance activities. Lastly, the Des Moines River Master Reservoir Regulation Manual, Water Control Manual for Lake Red Rock was updated in coordination with upstream and downstream stakeholders, to allow the lake to be better managed in terms of earlier reservoir releases ahead of increasing lake levels to prevent large operational releases.", "riverName":"DES MOINES", "separateStructuresCount":3, "sourceAgency":"US Army Corps of Engineers", "spillwayTypeId":2, "spillwayWidth":0, "stateFedId":"IA00013", "stateRegulatoryAgency":null, "stateRegulatedId":0, "structuralHeight":110, "submitDate":"2023-02-16T17:25:15.988Z", "surfaceArea":15250, "volume":6155800, "widthOfLocks":0, "secondaryWidthOfLocks":null, "yearCompleted":1969, "congDist":"Congressional District 01, Iowa", "city":"CARLISLE", "county":"Marion", "aiannh":null, "websiteUrl":"https://www.usace.army.mil/Missions/Civil-Works/Dam-Safety-Program/Article/2870967/dam-safety-program/", "coreTypeIds":null, "damTypeIds":"9;8", "fedConstructionIds":"1", "fedDesignIds":"1", "fedFundingIds":"1", "fedInspectionIds":"1", "fedOperationIds":"1", "fedOtherIds":"1", "fedOwnerIds":"1", "fedRegulatoryIds":"1", "formerNames":null, "foundationTypeIds":null, "nonFederalDamOnFederalId":0, "designerNames":null, "otherNames":"Lake Red Rock", "ownerNames":"USACE - Rock Island District", "ownerTypeIds":"3", "primaryDamTypeId":9, "primaryOwnerTypeId":3, "primaryPurposeId":9, "purposeIds":"9;5", "dsacId":4, "femaRegion":"7", "lastEapExcerDate":"2024-11-13T12:00:00.000Z", "dataUpdated":"2025-05-20T12:00:00.000Z", "usaceDistrict":"Rock Island District", "noConsequencesId":0, "secretaryAgricultureBuiltId":null, "nrcsWatershedAuthorizationId":null, "isAssociatedStructureId":"No", "fedRegulatedId":"Yes", "inundationNidAddedId":1, "damStatusId":2, "huc06":"071000", "doi_region":null, "doi_region_name":"Mississippi Basin", "doi_region_number":4, "thirtyYearAverage":301.564, "tenthPercentile":162.2544, "ninetiethPercentile":432.7396 }, "id":50017, "links":[ { "type":"application/json", "rel":"root", "title":"The landing page of this server as JSON", "href":"https://api.wwdh.internetofwater.app?f=json" }, { "type":"text/html", "rel":"root", "title":"The landing page of this server as HTML", "href":"https://api.wwdh.internetofwater.app?f=html" }, { "rel":"self", "type":"application/geo+json", "title":"This document as JSON", "href":"https://api.wwdh.internetofwater.app/collections/usace-edr/items/50017?f=json" }, { "rel":"alternate", "type":"application/ld+json", "title":"This document as RDF (JSON-LD)", "href":"https://api.wwdh.internetofwater.app/collections/usace-edr/items/50017?f=jsonld" }, { "rel":"alternate", "type":"text/html", "title":"This document as HTML", "href":"https://api.wwdh.internetofwater.app/collections/usace-edr/items/50017?f=html" }, { "rel":"collection", "type":"application/json", "title":"USACE Access2Water API", "href":"https://api.wwdh.internetofwater.app/collections/usace-edr" } ] }