Editing Canal pound (section)

===Winter===
[[file:Great_Falls_Feeder_Culvert_and_Lock_18_on_Chesapeake_and_Ohio_Canal.jpg|thumb|right|200px|Canal drained for winter. Note: water "stain" on lock masonry indicates normal water level.]]
Where ice would form during winter, the canal prism would usually be closed and drained. During this time, sand bars would be dug out, locks and other structures would be fixed.<ref>Old Towpaths, p. 308-309</ref> Exceptions to this would include wartime necessities, i.e. the Chesapeake and Ohio Canal was left open in the winters of 1861–1862 because of the American Civil War.<ref>Unrau, Historical Resource Survey, p. 724</ref>