Chino Ranch #1

Significant HazardSatisfactory ConditionEmergency Action Plan: Yes

Location

CountySan Bernardino
River/StreamTonner Canyon Cr
Coordinates33.98990, -117.78670

Physical Characteristics

Dam TypeEarth
NID Height22 ft
Dam Height22 ft
Dam Length460 ft
Year Completed1918 (108 years old)

Storage & Hydraulics

NID Storage137 acre-ft
Max Storage137 acre-ft
Surface Area20 acres

Ownership & Safety

PurposeWater Supply
OwnerTres Hermanos Conservation Authority
Owner TypePublic Utility
Hazard ClassificationSignificant
Condition AssessmentSatisfactory
Last Inspection06/10/2025
Emergency Action PlanYes

Identifiers

NID IDCA00755
Federal IDCA00755
More InfoState Dam Safety Program

Nearby Dams

Rancho Cielito 4.5 mi High Diemer No. 8 5.7 mi Significant Diemer Reservoir 5.8 mi High Diemer Ozone Contact Basin 5.8 mi High Carbon Canyon Dam 6.0 mi High Orange County Reservoir 6.7 mi Low Puddingstone 7.1 mi High 30 Mg Central Reservoir 8.3 mi High Weymouth Memorial Reservoir 8.3 mi High Yorba 8.3 mi High