Amy E East Joshua B Logan Mark C Mastin 20180604 2.0 comma-separated values data release doi:10.5066/F76972SC Pacific Coastal and Marine Science Center, Santa Cruz, California U.S. Geological Survey https://doi.org/10.5066/F76972SC https://www.sciencebase.gov/catalog/file/get/5a6fbc11e4b06e28e9cad6f6 Amy E East Joshua B Logan Mark C Mastin 2018 2.0 Digital data release doi:10.5066/F76972SC Pacific Coastal and Marine Science Center, Santa Cruz, California U.S. Geological Survey https://doi.org/10.5066/F76972SC The grain size of sediment on the riverbed was measured during 21 surveys on the Elwha River, Washington, between 2006 and 2022. Most data were collected along the same transects where channel topography was measured (see related child item in this data release with river-channel topography). Measurements of sediment ranging from medium sand to boulders were made using the CobbleCam digital photographic technique (Warrick and others, 2009), which uses a calibrated autocorrelation algorithm (Rubin, 2004) to calculate the mean grain size of sediment from pixels in downward-looking digital photographs. This technique yields grain-size values accurate to within 14 percent of those obtained by pebble counting (Wolman, 1954; Warrick and others, 2009). For samples finer than medium sand, we measured grain size using a Coulter laser particle-size analyzer at the USGS laboratory in Santa Cruz, California. Grain size was measured along subaerial portions of the survey transects within the bankfull channel. We also measured grain size of some sediment deposited after dam removal that did not coincide with survey transects (these sample locations are labeled “OffTransect” in the data file). References: Rubin, D.M., 2004, A simple autocorrelation algorithm for determining grain size from digital images of sediment: Journal of Sedimentary Research 74, p. 160–165, https://doi.org/10.1306/052203740160. Warrick, J.A., Rubin, D.M., Ruggiero, P., Harney, J.N., Draut, A.E., and Buscombe, D., 2009, Cobble Cam: grain-size measurements of sand to boulder from digital photographs and autocorrelation analyses: Earth Surface Processes and Landforms 34, p. 1811–1821, https://doi.org/10.1002/esp.1877. Wolman, M.G., 1954, A method of sampling coarse river-bed material: Eos Trans. AGU 35, p. 951–956, https://doi.org/10.1029/TR035i006p00951. Data were collected to study sediment in the Elwha River before and after the removal of the Glines Canyon and Elwha dams. Information about the data collection field activities can be found at: http://cmgds.marine.usgs.gov/fan_info.php?fan=2022-632-FA http://cmgds.marine.usgs.gov/fan_info.php?fan=2017-659-FA http://cmgds.marine.usgs.gov/fan_info.php?fan=2015-656-FA http://cmgds.marine.usgs.gov/fan_info.php?fan=ER114WA http://cmgds.marine.usgs.gov/fan_info.php?fan=ER113WA http://cmgds.marine.usgs.gov/fan_info.php?fan=ER112WA http://cmgds.marine.usgs.gov/fan_info.php?fan=ER111WA http://cmgds.marine.usgs.gov/fan_info.php?fan=ER210WA http://cmgds.marine.usgs.gov/fan_info.php?fan=ER110WA http://cmgds.marine.usgs.gov/fan_info.php?fan=ER209WA http://cmgds.marine.usgs.gov/fan_info.php?fan=ER109WA http://cmgds.marine.usgs.gov/fan_info.php?fan=ER208WA http://cmgds.marine.usgs.gov/fan_info.php?fan=ER108WA http://cmgds.marine.usgs.gov/fan_info.php?fan=ER107WA http://cmgds.marine.usgs.gov/fan_info.php?fan=ER106WA http://cmgds.marine.usgs.gov/fan_info.php?fan=W106PS 2006 2022 ground condition Complete None planned -123.625 -123.54 48.151755 47.954370 USGS Metadata Identifier USGS:5a6fbc11e4b06e28e9cad6f6 USGS Thesaurus grain-size analysis gravel deposits field inventory and monitoring river systems river reaches sediment transport Data Categories for Marine Planning Substrate ISO 19115 Topic Category inlandWaters None U.S. Geological Survey USGS Pacific Coastal and Marine Science Center PCMSC Coastal and Marine Geology Program CMGP Geographic Names Information Systems Elwha River State of Washington Glines Canyon Dam (historical) Elwha Dam (historical) no access constraints USGS-authored or produced data and information are in the public domain from the U.S. Government and are freely redistributable with proper metadata and source attribution. Please recognize and acknowledge the U.S. Geological Survey (USGS) as the originator of the dataset and in products derived from these data. U.S. Geological Survey, Pacific Coastal and Marine Science Center PCMSC Science Data Coordinator mailing and physical

2885 Mission Street

Santa Cruz CA 95060 United States 831-427-4747 pcmsc_data@usgs.gov https://www.sciencebase.gov/catalog/file/get/5a6fbc11e4b06e28e9cad6f6?name=Elwha_ReachTransectLocations.jpg&allowOpen=true Image map showing locations of study reaches and transects along the Elwha River, Washington JPG Data collection was funded by U.S. Geological Survey M G Wolman 1954 United States Transactions, American Geophysical Union, 35(6) David M Rubin 2004 Tulsa, OK Journal of Sedimentary Research, 74(1) John A Warrick David M Rubin Peter Ruggiero Jodi N Harney Amy E Draut 2009 online Earth Surface Processes and Landforms, 34 Data values are within the expected values. Data values are within the expected values. Data set is considered complete for the information presented, as described in the abstract. Users are advised to read the rest of the metadata record carefully for additional details. Initial survey control for all transects was established using static GPS occupations, which have an estimated horizontal accuracy of around 1.5 cm. Subsequent survey control densification within each reach was conducted using a total station. Repeat check measurements conducted during the surveys on points with established coordinates suggest a horizontal precision of around 3 cm for measurements at these sites. Initial survey control for all transects was established using static GPS occupations, which have an estimated vertical accuracy of around 2.5 cm. Subsequent survey control densification within each reach was conducted using a total station. Repeat check measurements conducted during the surveys on points with established coordinates suggest a vertical precision of around 3 cm for measurements at these sites. Measurements on sediment ranging from medium sand to boulders were made using the CobbleCam digital photographic technique (Warrick and others, 2009), which uses a calibrated autocorrelation algorithm (Rubin, 2004) to calculate the mean grain size of sediment from pixels in downward-looking digital photographs. This technique yields grain-size values accurate to within 14 percent of those obtained by pebble counting (Wolman, 1954). For samples finer than medium sand, we measured grain size using a Coulter laser particle-size analyzer at the USGS sediment laboratory in Santa Cruz, California, after removing any organic matter with a hydrogen peroxide solution. Grain size was measured along subaerial portions of the survey transects within the bankfull channel. We also measured grain size in parts of the study reaches containing new sediment deposits (after dam removal) that did not coincide with survey transects, collecting enough additional data in such cases to avoid spatial bias and ensure that grain-size measurements represented both the newly deposited material and any older sediment still exposed. In such cases, the data are coded as "OffTransect." 2022 Corrected name of theme keyword thesaurus from ISO 19115 Topic Categories to Category. 20180717 Susan A Cochran U.S. Geological Survey, Pacific Coastal and Marine Science Center mailing and physical

2885 Mission St.

Santa Cruz CA 95060 United States 831-460-7545 scochran@usgs.gov Corrected Point of Contact and Metadata Contact phone number prefix. 20180905 Susan A Cochran U.S. Geological Survey, Pacific Coastal and Marine Science Center mailing and physical

2885 Mission St.

Santa Cruz CA 95060 United States 831-460-7545 scochran@usgs.gov Edited metadata to add keywords section with USGS persistent identifier as theme keyword. No data were changed. 20201019 U.S. Geological Survey VeeAnn A. Cross Marine Geologist Mailing and Physical

384 Woods Hole Road

Woods Hole MA 02543-1598 508-548-8700 x2251 508-457-2310 vatnipp@usgs.gov Changes to version 2.0 of data release: - Added data from 2022 August survey (2022-632-FA). - Standardized numeric precision for MEAN-MM and MEAN-PHI, depending on ANALYSIS_METHOD. - Standardized numeric precision for N, E, Z, and Distance, depending on LOCATION_METHOD. - Added NaN values for all empty data. - Re-sorted based on Reach, Date, Transect, Distance. - Changed SEASON attribute to conform to standard definitions of season in northern hemisphere. Some samples from early September were reclassified as "Summer". 20250530 U.S. Geological Survey Joshua Logan Physical Scientist Mailing and Physical

2885 Mission St.

Santa Cruz CA 95060 United States 831-460-7519 jlogan@usgs.gov Data were collected along the Elwha River, Washington Point Point 5248 Universal Transverse Mercator 10N 0.9996 -123.0 0.0 500000.0 0.0 coordinate pair 0.001 0.001 METERS North American Datum of 1983 GRS 1980 6378137.0 298.26 North American Vertical Datum of 1983 0.001 meters Explicit elevation coordinate included with horizontal coordinates GrainSizes_ElwhaRiver_2006to2022.csv Grain size calculations for the Elwha River, 2006 to 2022 U.S. Geological Survey SEASON The season during the year in which the data was collected U.S. Geological Survey "Fall," "Spring," and "Summer" refer to the northern hemisphere season during which the data was collected DATE Data of the data collection, in ISO date format (year-month-day) U.S. Geological Survey 2006-09-23 2022-08-28 year-month-day REACH A unique location identifier indicating the name of the river reach where data was collected U.S. Geological Survey CR Control reach U.S. Geological Survey R1 Reach 1 U.S. Geological Survey R1B Reach 1B U.S. Geological Survey R2 Reach 2 U.S. Geological Survey R3 Reach 3 U.S. Geological Survey TRANSECT Transect identifying code, formatted as "reach-transect." For example, "R2-T3" represents Reach 2 Transect 3. U.S. Geological Survey See "REACH" attribute for “reach-” identifying codes. For the “transect” portion of the alpha-numeric code, the following definitions are used: T0=Transect 0; T1=Transect 1; T2=Transect 2; T3=Transect 3; T3B=Transect 3B; T4=Transect 4; T5=Transect 5; T6=Transect 6; SC5-T1=Side channel 5, transect 1; SC5-T2B=Side channel 5, transect 2B; SC5-T3=Side channel 5, transect 3; OffTransect=elevation points collected off transect. Note that transects associated with side channel 5 (SC5; not shown on index map) are separately numbered transects than the transects in the rest of Reach 2. Additionally, SC5-T2B is located between transects SC5 transects 2 and 3. MEAN-MM The mean particle size in the sample, measured in millimeters (mm). Measurements derived from CobbleCam are listed to 1 decimal place. Measurements derived from Sediment Lab are listed to 4 decimal places. U.S. Geological Survey 0.0 643.9 millimeters MEAN-PHI The mean particle size in the sample, measured in phi units. Measurements derived from CobbleCam are listed to 4 decimal places. Measurements derived from Sediment Lab are listed to 6 decimal places. U.S. Geological Survey -9.330700 6.898093 phi units ANALYSIS_METHOD The method in which the sample was analyzed to determine grain size U.S. Geological Survey CobbleCam Cobble Cam photographic autocorrelation analysis was used to determine grain size. U.S. Geological Survey SedimentLab A physical sample was collected and analyzed in the USGS PCMSC sediment lab. U.S. Geological Survey LOCATION_METHOD The method in which the sample was geographically located U.S. Geological Survey Surveyed Point was surveyed using GPS and total station methods. U.S. Geological Survey Interpolated Point was between two survey points and N, E, and Z values were interpolated between the two survey points U.S. Geological Survey Approximate Point was either on a transect but precise position was not measured (N and E values are derived from the mid-point of the transect); or point was off transect (TRANSECT=OffTransect) and N and E values derived from a point at the center of the study reach. Neither instance has a Z value. See the "TRANSECT" column to distinguish between the two cases. U.S. Geological Survey PID Unique identifier for the survey point collection ID. Unique for survey date at reach, but not unique between reaches, or between dates. (PID values may be repeated in the same file on separate dates). A PID value of -9999 indicates that the point was not surveyed with topographic measurements and was either interpolated or approximated. U.S. Geological Survey 15 9155 N Northing. Surveyed positions are listed to 3 decimal places. Interpolated positions are listed to 1 decimal place. Approximated positions are listed with integer precision. North American Datum of 1983, UTM Zone 10N 5311439.687 5332527.804 meters E Easting. Surveyed positions are listed to 3 decimal places. Interpolated positions are listed to 1 decimal place. Approximated positions are listed with integer precision. North American Datum of 1983, UTM Zone 10N 457159.339 459047.541 meters Z Elevation. Surveyed positions are listed to 3 decimal places. Interpolated positions are listed to 1 decimal place. "NaN" indicates no value was collected or position was approximated North American Vertical Datum of 1988 0.806 219.114 meters DISTANCE Distance from start point of transect, in meters. Off-transect points with no relevant transect start point are assigned a value of "NaN". U.S. Geological Survey 0.000 151.174 meters U.S. Geological Survey - ScienceBase U.S. Geological Survey mailing and physical

Denver Federal Center, Building 810, Mail Stop 302

Denver CO 80225 United States 1-888-275-8747 sciencebase@usgs.gov These data are available in csv format (GrainSizes_ElwhaRiver_2006to2022.csv), along with an image map of the study area and CSDGM FGDC-compliant metadata all contained in a single zip file. Unless otherwise stated, all data, metadata and related materials are considered to satisfy the quality standards relative to the purpose for which the data were collected. Although these data and associated metadata have been reviewed for accuracy and completeness and approved for release by the U.S. Geological Survey (USGS), no warranty expressed or implied is made regarding the display or utility of the data on any other system or for general or scientific purposes, nor shall the act of distribution constitute any such warranty. comma-delimited text zip file contains the csv table, associated metadata, and an image map of study area No compression applied 0.5 https://www.sciencebase.gov/catalog/file/get/5a6fbc11e4b06e28e9cad6f6 https://www.sciencebase.gov/catalog/item/5a6fbc11e4b06e28e9cad6f6 https://doi.org/10.5066/F76972SC Data can be downloaded using the Network_Resource_Name links. The first link is a direct link to download the zipped file of data and metadata. The second link points to a landing page with metadata and data. The third link points to the landing page for the entire data release. None The data are available in comma-separated values (CSV) spreadsheet format. Text editing software can be used to open the file, as well as spreadsheet programs, such as Microsoft Excel. 20250703 U.S. Geological Survey, Pacific Coastal and Marine Science Center PCMSC Science Data Coordinator mailing and physical

2885 Mission Street

Santa Cruz CA 95060 United States 831-427-4747 pcmsc_data@usgs.gov Content Standard for Digital Geospatial Metadata FGDC-STD-001-1998