Mana Reservoir, located in Mana, Hawaii, is a state-owned water resource managed by the Department of Land and Natural Resources (DLNR).
Wind
Humidity
Built in 1905, this earth dam stands at a height of 17 feet and serves primarily for irrigation purposes, with a storage capacity of 135 acre-feet. The reservoir spans 8.5 acres and is fed by the Kaawaloa Stream offstream, providing vital water supply to the surrounding area.
Despite its historical significance, Mana Reservoir poses a high hazard potential due to its poor condition as assessed in 2009. With a very high risk rating, the reservoir requires frequent inspections, with the last one conducted in November 2019. The emergency action plan (EAP) for Mana Reservoir was last revised in March 2021, underscoring the need for ongoing risk management measures to mitigate any potential threats to the dam's integrity. As a critical water source in Kauai, Hawaii, maintaining the safety and functionality of Mana Reservoir is paramount for ensuring sustainable water resource management in the region.
Year Completed |
1905 |
Dam Length |
1600 |
Dam Height |
17 |
River Or Stream |
KAAWALOA STREAM OFFSTREAM |
Primary Dam Type |
Earth |
Surface Area |
8.5 |
Hydraulic Height |
22 |
Drainage Area |
0.08 |
Nid Storage |
135 |
Structural Height |
25 |
Hazard Potential |
High |
Foundations |
Unlisted/Unknown |
Nid Height |
25 |
Waimea River Nr Waimea
|
295cfs |
Kawaikoi Stream Nr Waimea
|
30cfs |
Waialae Str At Alt 3
|
34cfs |
Wainiha River Nr Hanalei
|
178cfs |
Hanalei River Nr Hanalei
|
258cfs |
Eb Of Nf Wailua River Nr Lihue
|
39cfs |
| Location | Reservations | Toilets |
|---|---|---|
Polihale State Park - Kauai
|
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Camp Hale Koa
|
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Camp Alan Faye
|
||
Kaluahaulu
|
||
Wiliwili Camp
|
||
Lucy Wright Beach Park - Kauai
|