Upper Helemano Reservoir
Dam in Honolulu County, Hawaii · Tr-Poamoho Stream · forms Upper Helemano Reservoir
Height
51 ft
16 m (NID height)
Length
530 ft
162 m
Completed
1912
Upper Helemano Reservoir today
42.26 ft
7 days ▼ 0.81 ft
Normal storage
479 acre-ft
Normal for the date
Reservoir level measured Oct 23, 2026, 7:10 AM HST. Full level page →
Facts
- Purposes
- Irrigation
- Dam type
- Earth
- Structural height
- 51 ft
- Owner
- Private
- Maximum storage
- 700 acre-ft
- Surface area
- 17 acres
- Hydraulic height
- 46 ft
- Drainage area
- 0 sq mi
- Spillway
- Uncontrolled, 10 ft wide
- Army Corps district
- Honolulu District
- NID ID
- HI00022
Facts from the U.S. Army Corps of Engineers National Inventory of Dams, record updated Oct 6, 2026. Search NID ID HI00022 at nid.sec.usace.army.mil. Project website.