Willamette River surveys are channel-line and cross-line surveys from the mouth to the Morrison Bridge. Channel-line surveys are survey lines which run parallel to the channel, 7 lines across, 150 feet apart. Cross-line surveys are lines that run perpendicular to the channel, bank-to-bank and are generally 500 feet apart.

Survey data is referenced to Oregon North State Plane Coordinates North American Data 1983 with sounding reference below Columbia River datum (CRD) in U.S. Survey Feet to above Bonneville Dam where the soundings are referred to minimum operating pool elevation.