Cattail Marsh, part of Tyrrell Park, operated by the City of Beaumont, is a constructed wetland and natural area, featuring diked cells with open shallow water and mudflats.
Tyrrell Park has a nature center and botanical gardens, a golf course, stables, and several facilities for picnicing, walking and biking, and other activities. "Cattail Marsh" is the wetlands area along Hillebrandt Bayou that forms part of the final stages of water treatment for the city of Beaumont. There is a parking lot on the back side of the park road that makes a big loop beyond the golf course clubhouse. There is a sign for Cattail Marsh at the entrance to this parking lot. You can't drive into the wetlands, but you can park and hike along the levee roads.
The constructed wetlands receives flow from the main treatment process, which is located to the northeast, on the other side of Hillebrandt Bayou. The constructed wetlands are divided by levees into a number of cells. From these cells water flows to an area of more natural wetlands at the backside of the area, before water flows into Hillebrandt Bayou.