Approximate length of major drainage ditches and canals (excluding sloughs, lakes, ponds, larger channels): 56 miles.
Sauvie Island, located at the junction of the Willamette and Columbia Rivers, contains the majority of agricultural land within the West Multnomah SWCD.
The southern section of the island is mostly contained within dikes, and drained by the Sauvie Island Drainage Improvement District.
The middle section of the Island is dominated by Sturgeon Lake. A section of the Island on the east side of Sturgeon Lake is diked and drained by the Columbia Drainage District. The northern section of the Island is dedicated to the Sauvie Island Wildlife Area.
All of Sauvie Island, in Multnomah and Columbia Counties, is included in the West Multnomah Soil & Water Conservation District. When this district was originally formed, it was the “Sauvie Island Conservation District”.
The Multnomah County Goal 5 Inventory, January 1994, includes “Agricultural Ditches and Sloughs on Sauvie Island”, “Dairy Creek”, “Gilbert River & tributary drainageways/wetlands (in R1W sections 5, 8, 9, 16, 21, 22, 28, 29, 31, 32 & 33)”, “Howell Lake”, “Sand Lake”, “Small Unnamed Lake/Slough west of Wagon Wheel Hole Lake”, “Sturgeon Lake”, “Virginia Lakes”, and “Wagon Wheel Hole Lake” among the Protected Water Resource and Wetland Sites.