There are
1,623 mi
from Gresham, OR to Watertown, SD
That's the driving distance. It would take 1 day 3 hours to go from Gresham, Oregon to Watertown, South Dakota.
The flight distance (direct flight from Gresham, OR to Watertown, SD) is 1,228.06 mi.
1,623 mi = 1.61 kms