Neskowin Beach Golf Course closed 11/01 to 5/01 as it is essentially underwater almost half the year.
Neskowin, OR
It was earlier called Neskowin Marsh, and I think it is more wetlands than floodplain.
Two others in Oregon that I can recall. Furst is Trysting Tree in Corvallis (Ted Robinson). A university course it is built on the banks of the Willamette River, which frequently floods. The solution was elevated greens and tees. It would still flood, but with limited damage other than lost green fees. Second is Tualatin CC (Egan). The original design had a small area (2-3) acres that occasionally flooded, but affected 7,8,9. A land purchase and redesign by Cupp/Fought built on the hundred year flood plain.
A few years after the redesign it significantly flooded two years in a row, higher than basketball backboards. I dropped my membership, which was a mistake for access privileges.
And the two Heron Lakes courses, which held a US PubLinx, were built on the site of the 1948 (Memorial Day) Vanport Flood,
but that was caused by a broken dike.
In back to back years it floo