National Hydrological Briefing

US Weekly Lake Water Level Report

Week of October 11, 2026. A synthesized overview of the biggest weekly reservoir rises, steepest drawdowns, and regional drought hotspots based on verified public monitoring records.

📈 Biggest 7-Day Rises

Reservoirs experiencing the greatest storage gains following recent storm systems:

📉 Biggest 7-Day Drops

Waterbodies undergoing seasonal drawdowns or heavy hydro releases:

âš ī¸ Lowest Historical Percentiles

Lakes farthest below their historical seasonal norms for this calendar date:

National Hydrological Analysis

Water management across the United States reflects distinct regional seasonal patterns this week. In the South and Mid-Atlantic, late-season convective rainfall events produced moderate localized inflows across reservoirs in Georgia and North Carolina. In contrast, Southwestern impoundments along the Colorado River basin continue to operate in conservation pool defense under Bureau of Reclamation shortage guidelines.

For boaters planning weekend trips, ramp closures remain concentrated in waterbodies operating below the 25th historical percentile. Always check the Dock and Ramp Clearance Calculator before trailering watercraft to low-water basins.