Lakes / Hawaii / Kauai County / Alexander Reservoir
Alexander Reservoir, Hawaii
50 acres
Surface Area
Where It Sits, and How Deep It Goes
Locator - Hawaii
21.96 degrees N, 159.52 degrees W - Kauai County. State and county outlines drawn from Census boundary data; the lake marker is placed by its USGS National Hydrography Dataset coordinates, not by eye. Schematic - not a survey map.
How Alexander Reservoir Stacks Up
- Ranks #4 for surface area among the Hawaii lakes counted so far - 50 acres.
- About 10 miles from Lihue, as the crow flies.
Lakes Nearby
| Lake | County | Distance | Surface Area |
|---|---|---|---|
| Papuaa Reservoir | Kauai | 4.1 mi | 45 acres |
| Waita Reservoir | Kauai | 5.4 mi | 379 acres |
| Halenānahu Reservoir | Kauai | 5.9 mi | 27 acres |
| Kapaia Reservoir | Kauai | 9.1 mi | 34 acres |
| Menehune Fishpond | Kauai | 9.7 mi | 25 acres |
| Wailua Reservoir | Kauai | 11 mi | 48 acres |
Straight-line distance between lake centers.
Facts and Figures
Questions About Alexander Reservoir
How Big Is Alexander Reservoir?
Alexander Reservoir covers 50 acres in Kauai County, Hawaii.
What Is the Largest Lake in Kauai County?
Waita Reservoir is the largest lake in Kauai County, at 379 acres.
Largest Lakes in Hawaii
| # | Lake | County | Surface Area | Max Depth |
|---|---|---|---|---|
| 1 | Waita Reservoir | Kauai | 379 acres | - |
| 2 | Keālia Pond | Maui | 198 acres | - |
| 3 | Kanahā Pond | Maui | 52 acres | - |
| 4 | Alexander Reservoir | Kauai | 50 acres | - |
| 5 | Wailua Reservoir | Kauai | 48 acres | - |
All 11 Hawaii lakes ranked by surface area
Sources: USGS NHD (The National Map NHD MapServer layer 12) named waterbodies FTYPE 390/436; counties via Census point-in-polygon lake data (ID 31080548). Verified October 30, 2026.