In all the available satellite images this lake is not present or smaller and these road are actually present. What's happening in this area, is the lake expanding (so the aerial images are outdated) or is it receding (so we should follow the aerial images)? Also in this changeset you left behind some rivers (ex. https://www.openstreetmap.org/way/168230561 ) and isolated roads (ex. https://www.openstreetmap.org/way/1275159814 ), if the lake is expanding and they are submerged we should delete them as well. Anyway, today I re-traced some of these roads in https://www.openstreetmap.org/changeset/170199880 before noticing this situation, if they are actually wubmerged feel free to delete them (or maybe replace higway=* with submerged:highway=* to prevent mapping errors like this?).