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Data Series 475

Prepared in cooperation with Yakima County

Bathymetry and Near-River Topography of the Naches and Yakima Rivers at Union Gap and Selah Gap, Yakima County, Washington, August 2008

By M.C. Mastin and R.L. Fosness

Thumbnail of and link to report PDF (3.7 MB) Abstract

Yakima County is collaborating with the Bureau of Reclamation on a study of the hydraulics and sediment-transport in the lower Naches River and in the Yakima River between Union Gap and Selah Gap in Washington. River bathymetry and topographic data of the river channels are needed for the study to construct hydraulic models. River survey data were available for most of the study area, but river bathymetry and near-river topography were not available for Selah Gap, near the confluence of the Naches and Yakima Rivers, and for Union Gap. In August 2008, the U.S. Geological Survey surveyed the areas where data were not available. If possible, the surveys were made with a boat-mounted, single-beam echo sounder attached to a survey-grade Real-Time Kinematic (RTK) global positioning system (GPS). An RTK GPS rover was used on a walking survey of the river banks, shallow river areas, and river bed areas that were impenetrable to the echo sounder because of high densities of macrophytes. After the data were edited, 95,654 bathymetric points from the boat survey with the echo sounder and 1,069 points from the walking survey with the GPS rover were used in the study. The points covered 4.6 kilometers on the Yakima River and 0.6 kilometers on the Naches River. GPS‑surveyed points checked within 0.014 to 0.047 meters in the horizontal direction and -0.036 to 0.078 meters in the vertical direction compared to previously established survey control points

For additional information contact:
Director, Washington Water Science Center
U.S. Geological Survey, 934 Broadway - Suite 300
Tacoma, Washington 98402

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Suggested citation:

Mastin, M.C., and Fosness, R.L., 2009, Bathymetry and near-river topography of the Naches and Yakima Rivers at Union Gap and Selah Gap, Yakima County, Washington, August 2008: U.S. Geological Survey Data Series 475, 16 p.

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