The storm of August 18–19, 2024 brought10.5 million gallons of water into Mill Pond within a 24-hour period. It has been confirmed that, in addition to rainfall, a 48-inch New York State outfall pipe contributed to this amount since it empties into the pond. This state pipe collects stormwater from multiple sources, including nearby side roads, Gyrodyne to the west, the Stony Brook Railroad area to the east, and roadway runoff from side roads west and east of Route 25A. Additionally, an 18-inch Brookhaven outfall pipe also empties into Mill Pond, further contributing to the volume of water during the storm.
Studies Undertaken by WMHO
January 2025- Sediment in Mill Creek Survey – COMPLETED
February 2025- March 2025- Stony Brook Grist Mill and Harbor Road Condition Study – COMPLETED
May 2025- Ground Penetrating Radar of Harbor Road and Mill Creek Road – COMPLETED
May 2025-July 2025– Subsurface study, with geotechnical borings of Harbor Road and preliminary hydraulics report – COMPLETED
August 2025- DEC DAM Safety meeting to review initial hydraulics for dam classification and next steps for the design plans –COMPLETED
November 2025- In depth hydraulics report with four proposed dam designs – COMPLETED
December 2025- Downstream Study- IN PROGRESS