In what appears to be a last-ditch effort to block construction of Segment E, the straight-throught-the-Katy-Prairie section of the Grand Parkway scheduled to begin construction this month, the Sierra Club has filed a new suit against the Army Corps of Engineers, the DOT, the FHA, the Texas Transportation Commission, and several public officials. But the lawsuit also focuses attention on the health of the Addicks and Barker Dams on Buffalo Bayou, which control waterflow through west and Downtown Houston. According to a July 2010 document unearthed by the environmental group this past March through an information request, the Army Corps has rated the status of both dams as “urgent and compelling” since September 2009; that rating indicates the Corps considers them to be 2 of the 6 most dangerous dams in North America.