The limit of DAM/WEIR is the extent of the exposed built-up barrier.
If DAM/WEIR is earthen, and is named, and is ≥ 0.02" along the shortest axis,
If DAM/WEIR is nonearthen and is named,
If the DAM/WEIR is nonearthen and is ≥ 0.05" along the longest axis,
Source Interpretation Guidelines
If DAM/WEIR with Construction Material = Nonearthen meets capture
conditions, then capture DAM/WEIR and NONEARTHEN SHORE.
If a dam/weir does not meet capture conditions,
Then capture only SHORELINE.
If DAM/WEIR with Construction Material = Earthen meets capture
conditions, then capture both DAM/WEIR and SHORELINE.
If DAM/WEIR covers part of the same area as SPILLWAY, then capture both
DAM/WEIR and SPILLWAY where the features overlap.
If DAM/WEIR has an overflow spillway,
Then capture only DAM/WEIR (do not capture as SPILLWAY).
SPILLWAY may exist completely apart from the feature DAM/WEIR.
If DAM/WEIR meets capture conditions and carries ROAD that meets capture conditions, then capture both DAM/WEIR and ROAD.
Do not capture check dams as DAM/WEIR. See EMBANKMENT (Built-up
If a lock and DAM/WEIR share a name, as in "Lock and Dam #6,"
Then only collect the name with DAM/WEIR.
If DAM/WEIR is 1-dimensional,then capture NONEARTHEN SHORE or
SHORELINE only for the portion of DAM/WEIR that separates land from
If named earthen dams are shown by contours,
Then capture DAM/WEIR as the area defined by the portion of the shoreline that runs parallel to the squared-off contours and the arbitrary line surrounding the built-up barrier as indicated by the contours.
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