What is a significant factor for navigation in the Oswego Harbor of Refuge?

Adequate depth for large vessels is a significant factor for navigation in the Oswego Harbor of Refuge because it ensures that larger boats can safely enter and exit the harbor without the risk of grounding. The harbor functions as a safe refuge for vessels seeking shelter from inclement weather or rough waters on Lake Ontario. If the harbor does not have sufficient depth, especially during periods of low water levels, it could become inaccessible for larger vessels, limiting the harbor's utility for maritime activities.

While proximity to fishing grounds, presence of navigational aids, and connection to the Great Lakes system are important factors for overall maritime activity and safety, the depth of the water is critical to allow large crafts to utilize the harbor effectively. Without adequate depth, the navigation and operational capacity of the harbor would be severely restricted, making it less functional as a place of refuge for those vessels.