Failure Lake Lewisville's Dam has been a recent and occurring issue as it has been "crumbling," narrowly avoiding failure. The Dam holds an estimated 180 Billion Gallons of water, and its aging system, embankment, and support system has struggled to maintain its capacity. The Dam has had close calls, such as a sand-boil in 2015, which caused alarm. Transportation Nine bridges cross the lake: The main bridge on Interstate 35E crosses the lake on its western finger and is a notorious traffic bottleneck during rush hour. The 35Express project will increase the number of free lanes from 3 to 4 in each direction, and add a managed-toll lane in each direction. In parallel with the I-35E bridge is a railroad bridge carrying the DCTA's A-Train. Another regularly used bridge is on the lake's eastern finger through Little Elm, connecting two halves of Farm to Market Road 720, locally known as Eldorado Parkway. It carries most of the traffic from communities east of the lake to the Lewisville Lake Toll Bridge. US 380 crosses the extreme northern end in two places, each requiring a short bridge. To the west it crosses the Elm Fork, the lake's primary inlet. To the east it crosses the inlet at Pecan Creek. The Lewisville Lake Toll Bridge, opened on August 1, 2009, is a NTTA toll bridge connecting Little Elm via Eldorado Parkway and Interstate 35E near Swisher Road. It is to the north of the original Garza Dam. Two bridges, part of a northern extension of Farm to Market Road 2499, opened in 2011 and cross the lake's extreme western ends at the Bryant Branch and the Poindexter Branch. On the east side of the lake, F.M. 423 crosses the lake via a short bridge at the Stewart's Creek inlet. Highland Village/Lewisville Lake Station is a commuter rail stop on the DCTA A-train. It connects downtown Denton with DART's Green Line in Carrollton. See also Grapevine Lake Trinity River Authority Notes References External links 1940 Map of Lake Dallas US Army Corps of Engineers Texas Parks and Wildlife Lake Info Reservoirs in Texas Trinity River (Texas) Bodies of water of Denton County, Texas Lewisville, Texas Infrastructure completed in 1957 Protected areas of Denton County, Texas