A phone call to Rialto Harbor confirms that the owner has retired and this unique marina (see link below) is out of business. The spokesperson was unaware of any plans to re-open in the future.
This is indeed sad news for the cruising community. In my 30+ years of personally visiting marinas all over the Southeaster, I can say without any fear of inaccuracy that Rialto Harbor was one of the most enjoyable and unique marina facilities from Southern Virginia to New Orleans. Tucked in an almost secret-like stream off the Okeechobee Waterway, and set in a lush botanical setting, Rialto Harbor was much akin to a little piece of undiscovered paradise. Everyone who had the good fortune to visit here in the past, will deeply miss Rialto Harbor.

Cruising News:
It with much sadness that I report Rialto Marina on the Caloosahatchee has closed. We passed through east bound on the way to the Bahamas in late March and Bus was in business and full up. When we returned in late May, there was a banner across the sign at the oxbow entrance saying Marina Closed. This was always a favorite stop with great hospitality and beautiful grounds. Hopefully it will re-open in the future.
Bert Jones

http://www.rialtoharbor.com/