Problems viewing the hydrographic surveys? PC users need to install two DoD secure certificates into their web browser.
Click here to download the certificate installation instructions.
These data files show results of surveys made on the dates shown and can only be considered as indicating general conditions present at those times.
Columbia River Side Channel surveys are channel-line surveys of the projects adjacent to the Columbia River, such as ports or tributaries, which have a Federal-authorized channel. Channel-line surveys are survey lines which run parallel to the channel, 7 lines across, 150 feet apart.
Columbia River surveys are channel-line and cross-line surveys of the Columbia from The Mouth of the Columbia to Vancouver Turning Basin. 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.
Each channel status report below represents the controlling depth per channel quarter of all the District's navigational channels for surveys made on the dates shown. Reports are usually updated once a month. Click here for methodology diagram of extracting controlling depths.