Pia Mill Reservoir

High HazardPoor ConditionEmergency Action Plan: Yes

Location

CountyKauai
Nearest CityKOLOA
River/StreamWAIHOHONU STREAM OFFSTREAM
Coordinates21.92067, -159.47130

Physical Characteristics

Dam TypeEarth
NID Height17 ft
Dam Height17 ft
Dam Length450 ft
Year Completed1910 (116 years old)

Storage & Hydraulics

NID Storage38 acre-ft
Max Storage38 acre-ft
Normal Storage30 acre-ft
Surface Area6 acres
Drainage Area0 sq mi
Max Discharge440 cfs
Spillway TypeUncontrolled

Ownership & Safety

PurposeIrrigation
OwnerEric A. Knudsen Trust
Owner TypePrivate
Hazard ClassificationHigh
Condition AssessmentPoor
Last Inspection01/29/2026
Emergency Action PlanYes

Identifiers

NID IDHI00115
Federal IDHI00115
More InfoState Dam Safety Program

Nearby Dams

Omao Reservoir 0.8 mi High Puu O Hewa Reservoir 1.0 mi High Pinau Reservoir 1.1 mi High Waita Reservoir 1.4 mi High Aepoekolu Reservoir 1.4 mi High Aepoalua Reservoir 1.4 mi High Mauka Reservoir 1.4 mi High Piwai Reservoir 1.5 mi High Aepo Reservoir 1.5 mi High Huinawai Reservoir 1.6 mi High