Though Six Flags Over Texas has not made an official announcement (and may not), the new 2024 El Rio Lento project appears to be quietly cancelled. Six Flags Over Texas is set to unveil El Rio Lento, one of the world’s longest log flumes. A makeover of the world’s first-ever log ride, El Aserradero, El Rio Lento will feature one new lift hill and two big drops, including a steep nosedive.