Existing road shoulders will be preserved and enhanced where possible to allow for improved pedestrian use. The drainage improvements will help filter pollutants and reduce peak flows, helping to protect stream channels. They also improve roadside drainage and may reduce maintenance needs.
BES project page: http://www.portlandoregon.gov/bes/article/444481
The design plans are 90% complete and BES is resolving some technical challenges with driveway culverts.
The roadside drainage improvements are currently scheduled for 2014. Design work has been in flux based on some work that BES has been doing with PBOT.
The city plans to begin construction on SW Stephenson in summer 2013.
The Fanno and Tryon Creeks Watershed Management Plan (BES, 2005) identified roadside ditch improvements as an important management tool to help protect southwest streams, improve roadside drainage, and address recurring maintenance problems. Starting in 2001, the City's Bureau of Environmental Services improved roadside ditches to address specific drainage problems. Ditches that are deep and/or have recurring drainage problems are good candidates for drainage improvements. Existing ditches are converted to swales by installing perforated pipe and filling the trench with drain rock. The surface is completed with either soil planted with vegitation or drain rock.
The Fanno and Tryon Creeks Watershed Quality and TMDL CIP Pre-design Report (BES, 2008) identified potential roadside ditches for improvements along SW Hamilton, SW Stephenson, Garden Home Road and some other local streets. These ditches were identified in collaboration with the City's Bureau of Transportation and community representatives. Recently, work along SW Garden Home Road has been completed.
View the SW Stephenson Drainage and Road Shoulder Improvements plans (2-page PDF)
Existing road shoulders will be preserved and enhanced where possible to allow for improved pedestrian use.
The drainage improvements help filter pollutants and reduce peak flows, helping to protect stream channels. They also improve roadside drainage and may reduce maintenance needs.
Original plans to construct the SW Stephenson and SW Hamilton projects through December 2012 has been delayed. Work is now scheduled for summer 2013.
For more information contact: Jennifer Devlin (503) 823-6182