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For more information on the USGS-the Federal source for science about the Earth, its natural and living resources, natural hazards, and the environment-visit https://www.usgs.gov or call 1-888-ASK-USGS.For an overview of USGS information products, including maps, imagery, and publications, visit https://store.usgs.gov/.

Cover photos (clockwise from top left). Scour and erosion outside of the concrete lined Underwood Creek, September 17, 2012 (photo taken by Nicolas H. Buer); large outfall above scour pool upstream of confluence of Underwood Creek and Menomonee River, September 27, 2012 (photo taken by James D. Blount); concrete bank stabilizers along Underwood Creek, September 27, 2012 (photo taken by James D. Blount); failed concrete bed of Underwood Creek,

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