Dam Construction Impacts at LLELA

Construction associated with the $150 million Lewisville Dam Safety Modification project is moving forward and is beginning to impact LLELA visitors. The dam continues to function as intended providing flood risk management, water supply, environmental stewardship and recreational opportunities.

The current construction contract includes embankment modifications which will reduce risk by constructing improved seepage collection systems, and several earthen berms. Additionally, a filter will be placed at the downstream end of the outlet works conduit and a portion of the crest road used for surveillance of the dam will be replaced. Two construction locations are in the publicly accessible part of the Lewisville Lake Environmental Learning Area. Visitors will notice modifications being made to the dam embankment in one location to control a seep in that area, as well as some modification work being done on the concrete river outlet structure. Recreation users at Lewisville Lake will see an increase in construction traffic near the dam with building of a temporary road and delivery of material and equipment. Recreation access will be rerouted during construction, and some areas may be temporarily inaccessible during construction for the safety of our recreational users. Your patience and understanding is appreciated.

Due to safety concerns, there will be no LLELA visitor access within the construction site east of the river beginning in January 2020. This will include fishermen using the east bank access and hiker use of the Bittern Marsh Trail. City of Lewisville staff will continue maintenance of the Bittern Marsh Trail throughout construction, but it will not be available to visitors. All other LLELA hiking trails will remain open for the majority of the dam modification construction, and most programs and activities will continue with minor modifications.

Embankment work on the dam is scheduled for completion in February 2021, barring weather delays. The second and third contracts are for work on the auxiliary spillway at the far-east end of the dam, and for restoration of areas associated with the first two contracts. Both of these projects are expected to be completed in early 2027.

Additional Lewisville Dam Safety Modification Project information is available at the US Army Corps of Engineers Fort Worth District web site.