
USACE Walla Walla District Hydrographic Surveying Services
DEA has a long history of providing hydrographic and land surveying services to the Walla Walla District, including several surveys on the Columbia, Snake, and Clearwater Rivers.
DEA has a long history of providing hydrographic and land surveying services to the Walla Walla District, including several surveys on the Columbia, Snake, and Clearwater Rivers.
Since 2018, DEA Marine Services has provided hydrographic surveying and geoscientific consulting services as part of the Upper Columbia River Remedial Investigation and Feasibility Study.