Upper Massapequa Lake Dam

High HazardPoor ConditionEmergency Action Plan: Yes

Location

CountyNassau
Nearest CityMassapequa
River/StreamMASSAPEQUA BROOK
Coordinates40.67750, -73.46361

Physical Characteristics

Dam TypeEarth
NID Height11 ft
Dam Height11 ft
Dam Length200 ft
Year Completed1900 (126 years old)

Storage & Hydraulics

NID Storage128 acre-ft
Max Storage128 acre-ft
Normal Storage30 acre-ft
Surface Area17 acres
Drainage Area38 sq mi
Max Discharge900 cfs
Spillway TypeUncontrolled

Ownership & Safety

PurposeRecreation
OwnerNASSAU COUNTY DEPARTMENT OF PUBLIC WORKS
Owner TypeLocal Government
Hazard ClassificationHigh
Condition AssessmentPoor
Last Inspection11/22/2024
Emergency Action PlanYes

Identifiers

NID IDNY14084
Federal IDNY14084
More InfoState Dam Safety Program

Nearby Dams

Massapequa Lake Dam 0.8 mi Low Belmont Lake Dam 7.4 mi Low Hempstead Lake Dam 9.7 mi High South Pond Dam 10.0 mi Low Mill Pond Dam 14.2 mi Low