https://www.usa.gov/copyrighted-government-workshttps://www.rawpixel.com/image/12294725Edit ImageSaveSaveEditCropCustom TextGallipolis, Ohio. Roller dam showing how river barrier is raised or lowered. Sourced from the Library of Congress.View public domain image source hereMorePublic DomainFree CCO U.S. Government image for Personal and Business useInfoView CC0 LicenseEditorial use only JPEGTIFFSmall JPEG 1150 x 1200 px | 300 dpiLarge JPEG 3356 x 3500 px | 300 dpiBest Quality JPEG 4740 x 4944 px | 300 dpiTIFF 4740 x 4944 px | 300 dpi | 44.7 MBFree DownloadGallipolis, Ohio. Roller dam showing how river barrier is raised or lowered. Sourced from the Library of Congress.More