Digital Database of Channel Cross-Section Surveys, Mount St. Helens, Washington By Adam R. Mosbrucker, Kurt R. Spicer, Jon J. Major, Dennis R. Saunders, Tami S. Christianson, and Cole G. Kingsbury Data Series 951 First release: 2015 Revised: September 2023 (ver. 1.2) U.S. Department of the Interior U.S. Geological Survey Abstract: Stream-channel cross-section survey data are a fundamental component to studies of fluvial geomorphology. Such data provide important parameters required by many open-channel flow models, sediment transport equations, sediment budget computations, and flood hazard assessments. At Mount St. Helens, Washington, the long-term response of channels to the May 18, 1980 eruption, which dramatically altered the hydrogeomorphic regime of several drainages, is documented by an exceptional time-series of repeat stream-channel cross-section surveys. More than 300 cross sections, most established shortly following the eruption, represent more than 100 kilometers of surveyed topography. Although selected cross sections have been published previously in print form, we present a comprehensive digital database that includes geospatial and tabular data. Furthermore, survey data are referenced to a common geographic projection and to common datums. Database design, maintenance, and data dissemination are accomplished through a geographic information system (GIS) platform, which integrates survey data acquired with theodolite, total station, and global navigation satellite system (GNSS) instrumentation. Users can interactively perform advanced queries and geospatial time-series analysis. An accuracy assessment provides users the ability to quantify uncertainty within these data. At the time of publication, this project is ongoing. Regular database updates are expected; users are advised to confirm they are using the latest version. Disclaimer: Although these data have been processed successfully on a computer system at 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. The USGS shall not be held liable for improper or incorrect use of the data described and (or) contained herein. Contact Information: If you have any questions regarding this dataset please feel free to contact: Adam R. Mosbrucker U.S. Geological Survey 1300 SE Cardinal Court, Building 10, Suite 100 Vancouver, WA 98683 amosbrucker@usgs.gov 360-993-8975 Suggested citation: Mosbrucker, A.R., Spicer, K.R., Major, J.J., Saunders, D.R., Christianson, T.S., and Kingsbury, C.G., 2015, Digital database of channel cross-section surveys, Mount St. Helens, Washington (ver. 1.2, September 2023): U.S. Geological Survey Data Series 951, 9 p., and supplemental data https://doi.org/10.3133/ds951. ISSN 2327-638X (online) ---------------------------------------------------- This Data Series includes the following Information. ---------------------------------------------------- Report ds951.pdf -- PDF file of report by U.S. Geological Survey describing data compilation methods and accuracy assessment. Digital Data ds951.zip -- Digital cross-section survey data include geospatial and tabular files (_.shp, _.lyr, _.xls, _.jpg) as well as an ArcGIS Published Map file (_.pmf). Metadata fgdc_metadata.txt -- FGDC compliant metadata file for the Esri shapefiles (survey_lines_JPG and survey_lines_XLS).