POL Government Bureaus & Offices Environmental Services What We Do Watershed Services Portland's Watersheds Willamette Watershed Willamette Watershed Characterization Report  Willamette Subwatersheds   Conditions unique to each of the 27 Willamette subwatersheds
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Stormwater Conveyance

Outside of the combined sewer system, stormwater conveyance in this subwatershed consists primarily of roadside ditches in the area generally west of the Oregon Zoo and a few segments of open stream channel along the edges of the canyon occupied by Highway 26. A project to separate storm flows in the Tanner basin, as well as some flows from along West Burnside, is currently underway as part of the CSO Program.

CULVERTS (NUMBER OF) LENGTH OF CULVERTS (FT) PIPE AGE CLASS PIPE AGE LENGTH (FT) PIPE DIAMETER CLASS
PIPE LENGTH (FT)   
82.0 5377.0 1867-1899 4692.0 1" - 12" 15157.0
1900-1945 7613.0 13" - 24" 14725.0
1946-2001 16128.0 > 25" 8853.0
No Data 62734.0 No Data 52738.0
82 5377   91167   91473
Maps & Files

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