 In addition, Allen Parkway ends at the eastern boundary of the River Oaks neighborhood, providing a means for these residents to quickly reach downtown Houston.Due to its proximity to the flood-prone Buffalo Bayou, the underpasses are subject to flooding during heavy rains and flood gauges can be seen.In June 2001, though, heavy rains from Tropical Storm Allison caused Buffalo Bayou to overtop its banks and flood the entire parkway, in some places, to a depth of eight feet.