Diemer No. 8

Significant HazardSatisfactory ConditionEmergency Action Plan: Yes

Location

CountyOrange
River/StreamOffstream
Coordinates33.91340, -117.82250

Physical Characteristics

Dam TypeOther
NID Height172 ft
Dam Height172 ft
Dam Length1,004 ft
Year Completed1968 (58 years old)

Storage & Hydraulics

NID Storage18 acre-ft
Max Storage18 acre-ft
Surface Area1 acres
Drainage Area0 sq mi

Ownership & Safety

PurposeWater Supply
OwnerMetropolitan Water District Of Southern California
Owner TypePublic Utility
Hazard ClassificationSignificant
Condition AssessmentSatisfactory
Last Inspection08/13/2025
Emergency Action PlanYes

Identifiers

NID IDCA00220
Federal IDCA00220
More InfoState Dam Safety Program

Nearby Dams

Diemer Ozone Contact Basin 0.1 mi High Diemer Reservoir 0.3 mi High Carbon Canyon Dam 1.0 mi High Yorba 2.9 mi High Fullerton Dam 3.8 mi High Orange County Reservoir 3.9 mi Low 30 Mg Central Reservoir 5.0 mi High Chino Ranch #1 5.7 mi Significant Brea Dam - Saddle Dike 1 6.1 mi High Walnut Canyon 6.4 mi High