{ "bbox":null, "type":"Feature", "geometry":{ "bbox":null, "type":"Point", "coordinates":[ -96.9933, 32.645 ] }, "properties":{ "provider":"SWF", "code":"JPLT2", "slug":"jplt2", "elevation":0.0, "horizontal_datum":"", "vertical_datum":"NGVD29", "state":"TX", "kind":"PROJECT", "nearest_city":"Florence Hill, TX", "public_name":"Joe Pool Lake", "location_code":420048, "nsid":null, "aliases":{ "NID Dam Name":"JOE POOL LAKE", "NIDID":"TX08007" }, "timeseries":[ { "tsid":"JPLT2.Flow-Out.Inst.1Hour.0.Rev-SWF-REGI", "label":"Outflow", "base_parameter":"Flow", "parameter":"Flow-Out", "unit":"cfs", "unit_long_name":"Cubic feet per second", "latest_time":"2026-04-14T22:00:00Z", "latest_value":230.53, "delta24h":null, "sort_order":7, "results":null }, { "tsid":"JPLT2-Spillway.Flow-Out.Inst.1Hour.0.Rev-SWF-REGI", "label":"Surcharge Release", "base_parameter":"Flow", "parameter":"Flow-Out", "unit":"cfs", "unit_long_name":"Cubic feet per second", "latest_time":"2026-04-14T22:00:00Z", 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"units_long_name":"Acre-feet" } ], "id":550055, "associatedStructuresCount":0, "conditionAssessDate":null, "conditionAssessDetail":null, "conditionAssessId":6, "damHeight":108, "damLength":22180, "distance":null, "drainageArea":232, "eapId":1, "dsacAssignedDate":"2021-06-23T12:00:00.000Z", "eapMeetsGuidelinesId":1, "emergencyContactsUpdated":"2024-10-01T12:00:00.000Z", "eapLastRevDate":"2022-05-20T12:00:00.000Z", "enforcementAuthorityId":0, "federalId":"TX08007", "oldFederalId":"TX08007", "hazardId":4, "hydraulicHeight":103, "inspectionAuthorityId":0, "inspectionDate":"2023-04-10T12:00:00.000Z", "inspectionFrequency":5, "jurisdictionAuthorityId":0, "latitude":32.644009969, "lengthOfLocks":0, "secondaryLengthOfLocks":null, "longitude":-96.990959156, "maxDischarge":11900, "maxStorage":642500, "nidHeight":108, "nidStorage":642500, "normalStorage":176900, "numberOfLocks":0, "operationalStatusDate":"2021-06-23T12:00:00.000Z", "operationalStatusId":2, "originalDesignerName":null, "otherStructureId":null, "permittingAuthorityId":0, "politicalPartyId":null, "privateDamId":null, "projectDescription":"The U.S. Army Corps of Engineers (USACE) completed construction of Joe Pool Dam in May 1986. It is located at river mile 11.2 of Mountain Creek, a tributary to the West Fork of the Trinity River, near Grand Prairie, Texas. The authorized project\u2019s purpose is flood control, water supply, general recreation, and fish and wildlife enhancement. The dam is an earthen embankment over four miles long and consists of the following three parts: a 108-foot-tall main embankment, which is used to retain the water for the lake; an outlet works, which includes lifting gates and a pipe through the dam used to regulate water releases and water storage; and an ungated spillway, which allows water to flow out when lake levels exceed the available flood storage. The ungated spillway is a safety measure to prevent lake levels from overflowing the top of the dam in extreme flood events. It is also important because it directs how and where water is released. The reservoir is kept at or below the conservation pool elevation for most of the year. When heavy rains occur, surface water runoff is stored in the reservoir until the swollen streams and rivers below the dam recede and can handle the release of stored water minimizing loss of life, property, and negative impacts to the environment. Sometimes water must be released to protect the dam\u2019s integrity even though these streams and rivers may have already reached or exceeded their capacity.", "riskCharSummary":"Although Joe Pool Dam reduces the risk of flooding to downstream communities, the dam does not eliminate the risk of flooding. The most likely scenario that could result in downstream flooding due to floodwaters passed through the dam is high volume releases from Joe Pool Dam through the ungated spillway during high water events. These surcharge operational releases occur when the reservoir's flood storage capacity is exceeded and excess water flows through the spillway. Joe Pool Dam is designed to reduce the peak flooding levels downstream without risking the structural integrity of the dam. Despite the flood reduction benefits the dam provides, very rare, severe storms could still produce high reservoir levels impacting the lake adjacent communities of Arlington, Mansfield, and Cedar Hill and result in surcharge releases with the potential to exceed the capacity of the downstream channels and impact the communities of Grand Prairie, Irving, and Dallas, putting thousands of people at risk.\n\nIn January 2021, the U.S. Army Corps of Engineers (USACE) completed a risk assessment to evaluate the potential hazards to the dam, expected performance, and associated consequences. The risk assessment classified risks associated with Joe Pool Dam as moderate. This classification is based on the potential for high life loss and consequences due to unlikely, but a far more devastating scenario than presented above that would produce significant flooding. Risk for Joe Pool Dam is driven by an extremely unlikely flood event, unlike anything ever experienced in the area, resulting in water flowing over the top of the dam, potentially leading to erosion of the embankment and an eventual dam breach. In the remote event of a dam breach, downstream flood waters would be deep and travel down Mountain Creek, over Mountain Creek Lake Dam (NID ID TX00827) and to the confluence with the Trinity River through Dallas County, including downtown Dallas, TX, located approximately 17 miles downstream of the dam. In this unlikely scenario, downstream flooding in Dallas, TX would occur within 6.5 hours of breach, overtopping federal levees, destroying buildings and critical infrastructure such as police and fire stations, schools, and emergency medical facilities. In addition, some evacuation routes would be inundated, increasing evacuation distances. Although the large downstream communities have well-practiced emergency action plans; local emergency managers who meet regularly with USACE to discuss emergency response to flood events; and local emergency managers who are aware of the unlikely potential for dam failure, if a breach of the dam were to occur, it would result in severe economic damages and thousands of people\u2019s lives would be at risk within the inundated area.", "riskManagementMeasures":"The U.S. Army Corps of Engineers (USACE) Fort Worth District continuously takes additional steps to reduce the risk to the public. This includes working closely with local emergency managers to encourage and support the development and update of local evacuation plans to maximize evacuation time and designated evacuation routes. The USACE Emergency Action Plan for Joe Pool Dam is updated and exercised annually, improving emergency response and coordination between USACE elements and downstream federal, state, county, city agencies, and stakeholders. USACE also communicates risks associated with Joe Pool Dam annually with stakeholders and Emergency Managers. Inspections and monitoring are performed regularly to ensure the health and safety of the dam, and surveillance and inspections are increased as the lake elevation rises. Regular maintenance and repairs are performed as needed to keep the dam functioning properly. Joe Pool Dam has experienced several slope failures, a condition where the soil slides downhill, on the upstream and downstream portions of the dam embankment; repairs are being prioritized and completed according to the risk they pose to the project. The performance of Joe Pool Dam is also monitored by an instrumentation system allowing USACE staff to evaluate the dam for changing conditions. In addition, USACE continues to identify and implement interim risk reduction measures such as conducting regular surveillance of the dam, coordinating with local agencies to improve emergency response, assessing the current instrumentation program, and stockpiling materials for emergency flood fighting. Risk management of Joe Pool Dam is a priority for USACE at the national level which has led to higher level assessments in recent years. To understand the circumstances related to the concerns raised during a prior risk assessment, USACE conducted a more detailed analysis of the flood risks associated with the dam which will be continued on during an upcoming study to determine if any improvements to the dam are needed and evaluate various options for repairing the dam.", "riverName":"MOUNTAIN CREEK", "separateStructuresCount":0, "sourceAgency":"US Army Corps of Engineers", "spillwayTypeId":3, "spillwayWidth":50, "stateFedId":"TX08007", "stateRegulatoryAgency":null, "stateRegulatedId":0, "structuralHeight":108, "submitDate":"2023-10-05T00:00:00.000Z", "surfaceArea":7470, "volume":12700000, "widthOfLocks":0, "secondaryWidthOfLocks":null, "yearCompleted":1986, "congDist":"Congressional District 30, Texas", "city":"DALLAS", "county":"Dallas", "aiannh":null, "websiteUrl":"https://www.swf-wc.usace.army.mil/joepool/", "coreTypeIds":"3", "damTypeIds":"8", "fedConstructionIds":"1", "fedDesignIds":"1", "fedFundingIds":"1", "fedInspectionIds":"1", "fedOperationIds":"1", "fedOtherIds":"1", "fedOwnerIds":"1", "fedRegulatoryIds":"1", "formerNames":"Lakeview Dam", "foundationTypeIds":"1;3", "nonFederalDamOnFederalId":0, "designerNames":"CESWF", "otherNames":null, "ownerNames":"USACE - Fort Worth District", "ownerTypeIds":"3", "primaryDamTypeId":8, "primaryOwnerTypeId":3, "primaryPurposeId":9, "purposeIds":"9;4;5;8", "dsacId":3, "femaRegion":"6", "lastEapExcerDate":"2025-07-11T12:00:00.000Z", "dataUpdated":"2025-07-11T12:00:00.000Z", "usaceDistrict":"Fort Worth District", "noConsequencesId":0, "secretaryAgricultureBuiltId":null, "nrcsWatershedAuthorizationId":null, "isAssociatedStructureId":"No", "fedRegulatedId":"Yes", "inundationNidAddedId":1, "damStatusId":2, "huc06":"120301", "doi_region":"ART", "doi_region_name":"Arkansas-Rio Grande-Texas Gulf", "doi_region_number":6, "thirtyYearAverage":218.4591, "tenthPercentile":205.6126, "ninetiethPercentile":225.5869 }, "id":420048, "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/420048?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/420048?f=jsonld" }, { "rel":"alternate", "type":"text/html", "title":"This document as HTML", "href":"https://api.wwdh.internetofwater.app/collections/usace-edr/items/420048?f=html" }, { "rel":"collection", "type":"application/json", "title":"USACE Access2Water API", "href":"https://api.wwdh.internetofwater.app/collections/usace-edr" } ] }