Henry J. Mills Reservoir

High HazardSatisfactory ConditionEmergency Action Plan: Yes

Location

CountyRiverside
Nearest CityMission Grove
River/StreamOffstream
Coordinates33.92080, -117.32160

Physical Characteristics

Dam TypeEarth
NID Height23 ft
Dam Height23 ft
Dam Length2,038 ft
Year Completed1979 (47 years old)

Storage & Hydraulics

NID Storage83 acre-ft
Max Storage83 acre-ft
Surface Area6 acres

Ownership & Safety

PurposeWater Supply
OwnerMetropolitan Water District Of Southern California
Owner TypePublic Utility
Hazard ClassificationHigh
Condition AssessmentSatisfactory
Last Inspection12/09/2025
Emergency Action PlanYes

Identifiers

NID IDCA01085
Federal IDCA01085
More InfoState Dam Safety Program

Nearby Dams

Henry J. Mills No. 2 0.1 mi High Hj Mills Reclamation 0.4 mi Significant Alessandro 2.6 mi High Box Springs 2.6 mi High Sycamore 2.7 mi High Prenda 2.9 mi High Mary Street 3.3 mi High Woodcrest 3.5 mi High Pigeon Pass 4.5 mi High Sunnymead Ranch 5.2 mi High