Koolau Reservoir
Dam in Honolulu County, Hawaii · S Fork Kaukonahua · forms Koolau Reservoir
Height
70 ft
21 m (NID height)
Length
270 ft
82 m
Completed
1919
Koolau Reservoir today
6.78 ft
7 days ▲ 0.64 ft
Normal storage
122 acre-ft
Reservoir level measured Oct 23, 2026, 5:35 AM HST. Full level page →
Facts
- Purposes
- Other
- Dam type
- Earth
- Owner
- Schofield Barracks (Federal)
- Maximum storage
- 138 acre-ft
- Surface area
- 5 acres
- Spillway
- Uncontrolled, 60 ft wide
- Army Corps district
- Honolulu District
- NID ID
- HI00156
Facts from the U.S. Army Corps of Engineers National Inventory of Dams, record updated Oct 6, 2026. Search NID ID HI00156 at nid.sec.usace.army.mil. Project website.