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Water Level; Water Stored: Lake Hopatcong : USGS DATA
National Water Information System: Water Usage

Water Level, Real-Time Data for New Jersey: Streamflow -- 133 Websites, USGS DAT
National Water Information System: Streamflow

Boating Regulations: at State Police Website; upper right corner; Lake Hopatcong in Particular is in First Citing, Title 13, Chapter 82-3.11
State Police / Marine Services Boating Regulations