A proposed toll road garnered significant criticism from community activists. The 1998 bond proposal for the project allowed for a "parkway" within the project area. By 2007, Dallas business and political leaders had convinced the city to plan for a six- to eight-lane tollway that would link the suburban North Dallas area to southern-bound freeways with no entrance or exit ramps near the park. Following a requirement by the Army Corps of Engineers to move the road into the proposed park area, city councilwoman Angela Hunt and local activists argued that the road would cripple the planned development; tollway supporters pointed to the planned roadway's ability to decongest the undersized "Mixmaster" interchange between I-35, I-30 and US-75, and argued that attempting to move the road would require a cost-prohibitive exercise of eminent domain. In a referendum sparked by Hunt, voters narrowly approved the construction of the toll road, thanks primarily to voters in the suburban north end of the city. After the referendum controversy continued, citizens began to change their minds and the city council finally cancelled the road project in August 2017. The Margaret Hunt Hill Bridge, the largest portion of the Trinity project started thus far, is currently complete and open to traffic connecting Spur 366 to Singleton Blvd. Completed at a cost of $120 million, it opened March 2012. The Margaret McDermott Bridge, the second signature bridge, will replace the existing Interstate 30 bridge over the Trinity River. It was originally scheduled to begin construction in 2011, and be completed by 2014. However, in late 2011 funding for the bridge was moved to come from within the Project Pegasus initiative, with construction contracts to be awarded in mid-2012. The new plan features 'toned-down' elements of its original arch design, although Calatrava is still scheduled to perform the design work. As of April 2014, footings for the bridge's arches have been constructed, while steel fabrication has been taking place at Tampa Steel Erecting Company's plant in Florida. The general contractor, American Bridge, expected steel components to arrive on site in Dallas during the fall of 2014. The Trinity River Audubon Center opened in mid-October 2008. The set of trails and parks included in the project have varying start and end dates: for most, construction has already begun or will begin this year and is set to be complete in 2009. The standing wave will also begin construction in 2008 with a completion date of spring 2009. Both the sports complex and horse park are slated to break ground in 2009, with completion dates of 2010 and 2011, respectively.