Columbia Slough Watershed Facts 

^{The Columbia Slough watershed contains:}

• ^{32,700 acres}

• ^{Largest urban wetland in the USA (Smith and Bybee Lakes Wildlife Area )}

• ^{Salmon refugia in the Lower Slough}

• ^{175 bird species}

• ^{26 fish species}

• ^{6 lakes, 3 ponds, 50 miles of waterway}

• ^{30 miles of flood control levees}

• ^{158,000 residents (1/20 of Oregon's population)}

• ^{54 schools, 2 universities, 1 community college}

• ^{Critical wildlife corridors}

• ^{Portland International Airport}

• ^{Port of Portland marine terminals}

• ^{3,900 businesses}

• ^{57,000 jobs}

• ^{54% impervious surface}

• ^{Columbia South Shore Well Field (drinking water)}

• ^{One of Portland's "industrial sanctuaries"}

• ^{Critical transportation corridors (I-5, I-205, I-84)}

• ^{250,000 railroad cars per year use its railroad tracks}

• ^{The Slough is 303(d) water quality listed}

• ^{6 Golf Courses}

• ^{40 Mile Loop Trail}

• ^{Canoe and kayak launches}

• ^{426 acres without sewers}

• ^{Whitaker Ponds Environmental Learning Center}

• ^{Lewis and Clark expedition sites}

• ^{Historic Native American settlement sites}