St. Helena Ler

High HazardPoor ConditionEmergency Action Plan: Yes

Location

CountyNapa
Nearest CitySt. Helena
River/StreamTr Napa River
Coordinates38.50730, -122.49120

Physical Characteristics

Dam TypeEarth
NID Height44 ft
Dam Height44 ft
Dam Length856 ft
Year Completed1878 (148 years old)

Storage & Hydraulics

NID Storage210 acre-ft
Max Storage210 acre-ft
Surface Area12 acres
Drainage Area0 sq mi

Ownership & Safety

PurposeWater Supply
OwnerCity of Saint Helena
Owner TypeLocal Government
Hazard ClassificationHigh
Condition AssessmentPoor
Last Inspection06/11/2025
Emergency Action PlanYes

Identifiers

NID IDCA00148
Federal IDCA00148
More InfoState Dam Safety Program

Nearby Dams

Bell Canyon 3.3 mi High Crystal 3.5 mi High La Herradura 4.0 mi Low Naz Lake 4.4 mi Significant Henne 5.7 mi High Orville 5.8 mi High Angwin 6.0 mi High Deer Lake 6.2 mi High Araujo Reservoir No. 1 6.2 mi High Araujo Reservoir No. 2 6.3 mi High