On Tuesday and Wednesday, Dec. 18 and 19, crews installed the new box culvert at the SR 96 Seattle Hill Road repair site.
The new culvert is ten feet wide and five feet tall. By comparison, the old pipe culvert was just 18 inches in diameter. The new culvert is designed to protect against future flooding and improve fish passage. It can carry up to 95 cubic feet of water per second, while the old culvert could carry just six.
The culvert is made up of seven sections. Each section is 12 feet long and weighs about 15 tons, with a 10-ton lid.
Crews used 19 truckloads of streambed gravel - about 140 tons total - to line the bottom of the culvert.