A tidal and sea level survey was begun in Yaquina Bay, Oregon, on 8 May, 1964. A continuous recording tide gage was installed at the pier of the Oregon State University Marine Science Center. An harmonic analysis of the observed data was made, and the major tidal constants were compared with those published by the Coast and Geodetic Survey. A program was written for the IBM 1410 computer, so that the tide could be predicted at any time using the tidal constants for the Newport area. An investigation of the "meteorological tide" was made by comparison of the predicted and observed tides. River stage, sea level variation, barometric pressure, and wind were considered. Lastly, a comparison was made between the predicted tide at Newport and the predicted maxima and minima of the tide at Newport as determined using the Coast and Geodetic Survey's tide table. / Graduation date: 1965