Rock Island Lake Dam

Significant HazardPoor ConditionEmergency Action Plan: Yes

Location

StateNew Jersey
CountySussex
Nearest CitySparta
River/StreamSparta Glen-TR
Coordinates41.04087, -74.58413

Physical Characteristics

Dam TypeEarth
NID Height19 ft
Dam Height19 ft
Dam Length500 ft
Year Completed1940 (86 years old)

Storage & Hydraulics

NID Storage61 acre-ft
Max Storage61 acre-ft
Normal Storage50 acre-ft
Surface Area11 acres
Drainage Area0 sq mi
Max Discharge9 cfs

Ownership & Safety

PurposeRecreation
OwnerRock Island Lake Owners Assoc.
Owner TypePrivate
Hazard ClassificationSignificant
Condition AssessmentPoor
Last Inspection03/17/2024
Emergency Action PlanYes

Identifiers

NID IDNJ00819
Federal IDNJ00819
More InfoState Dam Safety Program

Nearby Dams

Glen Lake Dam 1.2 mi High Morris Lake Dam 1.2 mi High Hawthorne Lake Dam 1.3 mi Low Sunset Lake Dam 1.6 mi Low Mount Paul Dam 2.0 mi High Camp Ryker Lake Dam 2.0 mi Significant Heaters Pond Dam 2.2 mi High Lake Saginaw Dam 2.4 mi Low Blue Heron Lake Dam 2.4 mi Low Lake Morski Oko Dam 2.4 mi Low