When I did that trip a year ago, they were doing water
releases from lake Okeechobee through the spillway and lock at Moorehaven on the west side of the lake.
I had to get a tow through the old railway bridge into the lock at Moorehaven, as my twin diesels couldn't overcome the 12 knot current
coming through the railway bridge. I actually was going backwards under full power when I tried to approach the lock!!
Fond memories of Clewiston though. I highly recommend the "Rim Route"!!
Rick in Florida