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Rating depth structure for largemouth bass.
Recent public catches load as you reach this section.
50-acre reservoir near Kalāheo. The lake tops out around 35 ft. Bathymetry on this water is estimated from its real outline and maximum depth. Use it to shortlist water, then verify with your electronics — and never navigate by it. Every species below gets its seasonal read from the same numbers driving the chart.
Alexander Reservoir maps at 50 acres behind 2 miles of shoreline. With a 2 development index there's bank structure worth casting at, in moderation. The shallow band under 15 ft claims about 47% of the surface on the model — that's where the groceries are. Figure 0.6 mi of water from one end to the other, 0.3 mi at the beam. It sits in Kauai County. Its nearest charted neighbour, Ipuolono Reservoir, is 3 mi to the south.
Come spring, look for largemouth bass tight to the bank in 2 to 10 ft. They move out to 8 to 20 ft in summer and finish the year down in 15 to 35 ft. If you only fish one area, make it Shallow bay flat: a weed flat around 4 ft that scores prime in spring. Best bite is early morning and the evening. A texas-rigged 10" worm or a deep-diving crankbait is the honest summer answer here.
| Season | Depth | Best window | Start at | Go-to baits |
|---|---|---|---|---|
| Spring | 2 to 10 ft | dawn & dusk | Shallow bay flat (4 ft) | Spinnerbait, Chatterbait |
| Summer | 8 to 20 ft | dawn & dusk | Break off the point (16 ft) | Texas-rigged 10" worm, Deep-diving crankbait |
| Fall | 4 to 15 ft | midday & dawn | Main-lake point (9 ft) | Squarebill crankbait (shad), Spinnerbait |
| Winter | 15 to 35 ft | midday | Break off the point (16 ft) | Blade bait, Jigging spoon |
Early season peacock bass (tucunaré) use the shallows, holding in 2 to 12 ft. Summer is a 3 to 15 ft game here, winter a 6 to 22 ft one. The chart's best answer is Main-lake point — point, 9 ft, prime for spring. Best bite is midday and early morning. Tie on a topwater (walking bait) or a jerkbait and you're in the game.
| Season | Depth | Best window | Start at | Go-to baits |
|---|---|---|---|---|
| Spring | 2 to 12 ft | midday & dawn | Main-lake point (9 ft) | Topwater prop bait, Jerkbait (fire tiger) |
| Summer | 3 to 15 ft | midday & dawn | Main-lake point (9 ft) | Topwater (walking bait), Jerkbait |
| Fall | 3 to 15 ft | midday & dawn | Main-lake point (9 ft) | Jerkbait, Swimbait |
| Winter | 6 to 22 ft | midday | Break off the point (16 ft) | Slow jerkbait, Jig |
Come spring, look for channel catfish tight to the bank in 3 to 12 ft. They move out to 8 to 25 ft in summer and finish the year down in 11 to 35 ft. If you only fish one area, make it Deep basin: a deep basin around 30 ft that scores prime in winter. Best bite is after dark and the evening.
Depth note: when a documented seasonal range extends below this chart, the table shows the deepest mapped working water, not a verified holding depth.
| Season | Depth | Best window | Start at | Go-to baits |
|---|---|---|---|---|
| Spring | 3 to 12 ft | dusk | Shallow bay flat (4 ft) | |
| Summer | 8 to 25 ft | night & dusk | Break off the point (16 ft) | |
| Fall | 10 to 30 ft | dusk | Deep basin (30 ft) | |
| Winter | 11 to 35 ft chart-limited; documented 20 to 40 ft | midday | Deep basin (30 ft) |
Come spring, look for bluegill tight to the bank in 1 to 6 ft. Expect a summer slide to 4 to 15 ft, then a winter hold in 10 to 25 ft. Start at Shallow bay flat. It's a weed flat holding about 4 ft of water and rates prime come spring. Prime time lands in early morning and the evening. A small sponge spider (fly) or a micro tube jig is the honest summer answer here.
| Season | Depth | Best window | Start at | Go-to baits |
|---|---|---|---|---|
| Spring | 1 to 6 ft | midday & dusk | Shallow bay flat (4 ft) | 1/32 oz jig + micro plastic, Tiny popper (evenings) |
| Summer | 4 to 15 ft | dawn & dusk | Shallow bay flat (4 ft) | Small sponge spider (fly), Micro tube jig |
| Fall | 6 to 18 ft | midday | Break off the point (16 ft) | Micro jig + waxworm, Small spoon tipped |
| Winter | 10 to 25 ft | midday | Deep basin (30 ft) | Tiny spoon |
When the water first warms, tilapia slide up into 1 to 6 ft. Summer is a 2 to 10 ft game here, winter a 5 to 18 ft one. Start at Shallow bay flat. It's a weed flat holding about 4 ft of water and rates prime come spring. The feeding windows run midday and early morning. Keep a micro-jig near weed edges rigged through the warm months.
| Season | Depth | Best window | Start at | Go-to baits |
|---|---|---|---|---|
| Spring | 1 to 6 ft | midday & dusk | Shallow bay flat (4 ft) | Tiny jig + bread-ball tip, Small worm under float |
| Summer | 2 to 10 ft | midday & dawn | Shallow bay flat (4 ft) | Micro-jig near weed edges |
| Fall | 3 to 12 ft | midday | Shallow bay flat (4 ft) | Small jig tipped with worm |
| Winter | 5 to 18 ft | midday | Break off the point (16 ft) | Slow micro-jig, warm outflows |
Spring common carp on Alexander Reservoir hold shallow, usually 2 to 10 ft. By summer they slide out to 3 to 15 ft, and by winter most fish are in 10 to 30 ft. The chart's best answer is Shallow bay flat — weed flat, 4 ft, prime for spring. Prime time lands in early morning and the evening.
| Season | Depth | Best window | Start at | Go-to baits |
|---|---|---|---|---|
| Spring | 2 to 10 ft | midday & dawn | Shallow bay flat (4 ft) | |
| Summer | 3 to 15 ft | dawn & dusk | Shallow bay flat (4 ft) | |
| Fall | 5 to 18 ft | midday | Shallow bay flat (4 ft) | |
| Winter | 10 to 30 ft | midday | Deep basin (30 ft) |
Count 6 structure marks on this chart. The deepest, Deep basin, sits near 30 ft.
Season dates, license requirements, and size and bag limits for Hawaii waters are set by the Hawaii DLNR — and special regulations can apply to Alexander Reservoir specifically, so confirm the current rules before you fish.
Check the official Hawaii fishing regulations →
Alexander Reservoir is about 35 ft (11 m) deep at its deepest point. The contours here are modeled from the water's real shape and maximum depth, so treat them as a rough guide.
Anglers target largemouth bass, peacock bass (tucunaré), channel catfish, bluegill, tilapia, common carp on Alexander Reservoir.
Shallow bay flat is the top-rated area: a weed flat in about 4 ft of water that rates prime for largemouth bass in spring. Every other rated spot, per species and season, is on the map above.
For largemouth bass, the summer bite is best in early morning and the evening. Each species page section below lists the seasonal windows, and the map shows a live NOW badge when you're inside one.
Fishing on Alexander Reservoir is regulated by the Hawaii DLNR. Check the official Hawaii regulations for current license requirements, season dates, and size and bag limits — special regulations can apply to this specific water.
Ipuolono Reservoir 3 mi · Aepo Reservoir 4 mi · Mauka Reservoir 4 mi · Aepoeha Reservoir 5 mi · Waita Reservoir 5 mi · Halenanahu Reservoir 6 mi · Kapaia Reservoir 9 mi · Wailua Reservoir 11 mi · Puʻu Lua Reservoir (Kōkeʻe) 13 mi · Kalihiwai Reservoir 17 mi · Puu Ka Ele Reservoir 17 mi · Waiakalua Reservoir 19 mi
See how Alexander Reservoir stacks up: best largemouth bass lakes in Hawaii · best peacock bass (tucunaré) lakes in Hawaii · best tilapia lakes in Hawaii · best bluegill lakes in Hawaii
More water nearby: Kauai County fishing maps (13 charts). Browse all Hawaii fishing maps. See every water on DepthScout. How we build these maps. Fish here with a sonar unit that logs? Send us your depth data and we'll improve this chart, credited to you. For fishing guidance only, never navigation.