The chart above provides a summary of water stage in Lake Okeechobee (top) and discharge down the Caloosahatchee River (bottom). The discharge volume graph differentiates between water entering the Caloosahatchee estuary as a Lake release (blue) and as runoff from the watershed (green).
But in the big scheme of things ...
Lake O wasn't that high.
It's just the regulation schedule that changed instead.