The blue line that bends around a sealed door on the old flood map has appeared in later plans as if it were a surveyed channel. The lower archive’s copy register tells a different, more limited story: the map was recopied, then annotated decades later, but the field date for that line is missing.
The original mapmaker’s loose notes use the same blue ink for water routes and for corrections made after a survey. They do not mark which use applies at the sealed door. The archive has compared the map with the modern west-face survey and found no matching field measurement for the route.
Archivist Ava Korr said the collection is separating observed marks from later attribution in each entry. A blue line is evidence that a line was drawn; without a dated field note, it is not proof that water once passed through the door.
The reservoir office will keep the older mark in its record while it gathers a current reading at the spillway. The map room has not recommended changing the release schedule. Until the line can be matched to a survey, it should remain a question in the archive, not a capacity estimate in the water plan.
