Status

Construction Phase (Estimated completion in December 2023)

The first of two new pipes were installed underneath portions of the W&OD Trail (in conjunction with the Dual Trails widening project) in June 2021. The second phase is underway where the project will be completed with new culvert installed and pipe lining performed to the junction with Four Mile Run. The project is estimated to be complete by December 2023.

About the Project

Trammel Branch is located northern central City line and at its outfall to Four Mile Run drains 128 acres in total.  The most northern part of the watershed's drainage is routed down the W&OD trail in a 6-foot corrugated metal pipe. The southern part of the watershed collects in a stream that meanders from up near Great Falls Street and the W&OD to W. Columbia Street and Shadow Walk Drive. It is at this point that it drains into the W&OD trail pipe mentioned above and then into Four Mile Run. 

Drainage problems exist in the W. Columbia Street and Shadow Walk Drive areas of the watershed where there has been finished floor flooding at homes.  The issue is an undersized pipe under the W&OD trail that backs water up to these areas of open stream segments flooding homes in the process.  The design calls for construction of 500 feet of concrete box culvert to replace the broken and damaged culvert.