from The Century Dictionary.
- noun The highest level to which water rises during a time of flood. Such levels are often recorded by flood-marks, or bench-marks cut into stone walls, wooden posts, or buildings.
Sorry, no etymologies found.
The drive to Yellowstone National Park, Wyoming, takes me through Utah, Idaho and Wyoming - over 300 miles which is covered in a leisurely 4.5 hours so I'm there by lunchtime, and takes me through a landscape of sweeping hills, flood-plane flats, salt-lakes, and turns gradually cooler into alpine climates, with long straight roads bordered by fir an pine trees as far as the eye can see.