What defines a restricted zone in US navigable waters?

A restricted zone in US navigable waters is defined as the area extending from the shore up to 3 nautical miles (nm). This zone typically encompasses waters that are subject to state jurisdiction, which allows states to establish certain regulations and restrictions, particularly in terms of fishing, boating, and other activities. Within this vicinity, local laws may be enforced that impact navigation and usage of the waters, reflecting the need for safety and environmental protection.

In contrast, waterways extending beyond 3 nm from the shore fall into different regulatory categories—specifically, those from 3 to 12 nm, and beyond 12 nm, which are typically governed by federal regulations rather than state law. The focus of the restricted zone on the area closest to the shore aligns with the safety and management issues that often require immediate oversight due to the higher density of maritime activities and resources in these nearshore areas.