New 40-foot Culvert Placed at Main Avenue

The crew has been hard at work constructing the new 40-foot culvert that replaces the previous 10-foot culvert at Main Avenue and Gee Creek in Ridgefield, WA.

The crew has been hard at work constructing the new 40-foot culvert that replaces the previous 10-foot culvert at Main Avenue and Gee Creek in Ridgefield, WA.

After several weeks of site preparation, one of the main features of Ridgefield’s Main Avenue Project has been installed - the 40-foot culvert through which Gee Creek will flow beneath Main Avenue. How big is a 40-foot culvert? Well, the current Ridgefield National Wildlife Refuge Headquarters office would fit comfortably inside this arch.

Once the culvert is fully assembled, the bottom 1/3 will be filled with material and the creek will be returned to the culvert. When complete, Gee Creek will be able to naturally meander, cut, deposit, flood, and retreat within the limits of this larger structure.

Installation of the culvert involved placing footings, then craning precast, curved sections into place. This video gives you a sense of what that operation looked like:

In addition to the culvert, the crew also made progress establishing a new wetland area at the connection point of Gee Creek and a smaller, unnamed creek that runs parallel to Main Avenue on its East side.

Prior to the Main Avenue Project, this unnamed creek connected with Gee Creek before going under Main Ave. This project will include giving the unnamed creek its own culvert under Main Ave (10-foot diameter), then connect it to Gee Creek further down stream. The new connection point will be a wetland area planted with native trees, shrubs, and sedges. The wetland area will also have large sequoia tree root wads and rock weirs, which will help control the flow of the creek.