Which organization is NOT involved in the operational control of Lake Ontario waters?

The correct choice indicates that the Lakes Ontario Authority is not involved in the operational control of Lake Ontario waters. This is accurate because the Lakes Ontario Authority primarily focuses on water management policies and regulatory frameworks rather than direct operational control of water levels and flow.

In contrast, the other organizations listed have specific roles in the operational management and control of waters in the Lake Ontario area. The St Lawrence Seaway Development Corporation and the St Lawrence Seaway Management Corporation of Canada are key entities involved in the regulation of water flow and navigation in the St. Lawrence Seaway, which impacts the waters of Lake Ontario. The Welland Canal Authority oversees the operation of the Welland Canal, a critical shipping route that connects Lake Ontario with Lake Erie, directly influencing water levels and traffic in the region.

Thus, the distinction lies in the fact that while the others are directly engaged in managing and controlling water levels and flows, the Lakes Ontario Authority serves a broader regulatory and policy-related function without direct involvement in operational control.