Longwood Lake Dam

High HazardPoor ConditionEmergency Action Plan: Yes

Location

StateNew Jersey
CountyMorris
Nearest CityJefferson
River/StreamRockaway River
Coordinates40.97790, -74.54662

Physical Characteristics

Dam TypeStone
NID Height22 ft
Dam Height22 ft
Dam Length91 ft
Year Completed1898 (128 years old)

Storage & Hydraulics

NID Storage351 acre-ft
Max Storage351 acre-ft
Normal Storage214 acre-ft
Surface Area43 acres
Drainage Area19 sq mi
Max Discharge813 cfs

Ownership & Safety

PurposeRecreation
OwnerJersey City Municipal Utilities Authority
Owner TypeLocal Government
Hazard ClassificationHigh
Condition AssessmentPoor
Last Inspection03/21/2024
Emergency Action PlanYes

Identifiers

NID IDNJ00333
Federal IDNJ00333
More InfoState Dam Safety Program

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