Particle-size data collected of the upper 25 cm of substrate was collected at 12 sites in October 2018 and May 2019 at Olsen's Beach in Lake Ozette, Clallam County, Washington. At emergent stations, the top 25 cm of substrate was collected using a shovel and was transferred into a bucket. Bulk sediment samples were collected at submergent stations using a McNeil sampler inserted into the lakebed (McNeil and Ahnell, 1964) from which sediment was extracted by hand to a depth of 25 cm below the lakebed and residual water containing suspended sediment was sampled. Particle size distribution of sediment larger than 8 mm was sieved and weighed in the field and sediment less than 8 mm was sent to the USGS Cascades Volcano Observatory (CVO) sediment laboratory for particle-size distribution analysis. The volume of residual water within the McNeil sampler was measured and its suspended sediment concentration was analyzed at USGS CVO.