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23-acre reservoir near Wahiawā. The lake tops out around 30 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. Below is the species-by-species picture, pulled from the same data the map uses.
Upper Helemano Reservoir maps at 23 acres behind 1.3 miles of shoreline. A middling shoreline index (2) gives it some bays to work without being a maze. The shallow band under 15 ft claims about 82% of the surface on the model — that's where the groceries are. Call it 0.5 mi long by 0.2 mi wide at the broadest reach. It sits in Honolulu County. Its nearest charted neighbour, Lake Wilson (Wahiawā Reservoir), is 2 mi to the south.
Early season largemouth bass use the shallows, holding in 2 to 10 ft. Summer is an 8 to 20 ft game here, winter a 9 to 30 ft one. The chart's best answer is Shallow bay flat — weed flat, 4 ft, prime for spring. Best bite is early morning and the evening. Tie on a texas-rigged 10" worm or a deep-diving crankbait and you're in the game.
| 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 (14 ft) | Texas-rigged 10" worm, Deep-diving crankbait |
| Fall | 4 to 15 ft | midday & dawn | Main-lake point (8 ft) | Squarebill crankbait (shad), Spinnerbait |
| Winter | 9 to 30 ft | midday | Break off the point (14 ft) | Blade bait, Jigging spoon |
Come spring, look for peacock bass (tucunaré) tight to the bank in 2 to 12 ft. They move out to 3 to 15 ft in summer and finish the year down in 6 to 22 ft. If you only fish one area, make it Main-lake point: a point around 8 ft that scores prime in spring. Best bite is midday and early morning. A topwater (walking bait) or a jerkbait is the honest summer answer here.
| Season | Depth | Best window | Start at | Go-to baits |
|---|---|---|---|---|
| Spring | 2 to 12 ft | midday & dawn | Main-lake point (8 ft) | Topwater prop bait, Jerkbait (fire tiger) |
| Summer | 3 to 15 ft | midday & dawn | Main-lake point (8 ft) | Topwater (walking bait), Jerkbait |
| Fall | 3 to 15 ft | midday & dawn | Main-lake point (8 ft) | Jerkbait, Swimbait |
| Winter | 6 to 22 ft | midday | Break off the point (14 ft) | Slow jerkbait, Jig |
Early season channel catfish use the shallows, holding in 3 to 12 ft. Summer is an 8 to 25 ft game here, winter a 9 to 30 ft one. The chart's best answer is Deep basin — deep basin, 26 ft, prime for winter. Best bite is after dark and the evening.
| 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 | Deep basin (26 ft) | |
| Fall | 10 to 30 ft | dusk | Deep basin (26 ft) | |
| Winter | 9 to 30 ft | midday | Deep basin (26 ft) |
Spring bluegill on Upper Helemano Reservoir hold shallow, usually 1 to 6 ft. By summer they slide out to 4 to 15 ft, and by winter most fish are in 10 to 25 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. The summer box starts with a small sponge spider (fly) or a micro tube jig.
| 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 (14 ft) | Micro jig + waxworm, Small spoon tipped |
| Winter | 10 to 25 ft | midday | Deep basin (26 ft) | Tiny spoon |
Spring tilapia on Upper Helemano Reservoir hold shallow, usually 1 to 6 ft. They move out to 2 to 10 ft in summer and finish the year down in 5 to 18 ft. Put Shallow bay flat first on the milk run — a weed flat near 4 ft that grades prime for spring. The feeding windows run midday and early morning. The summer box starts with a micro-jig near weed edges.
| 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 (14 ft) | Slow micro-jig, warm outflows |
Structure-wise the chart holds 5 features, led in depth by Deep basin at roughly 26 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 Upper Helemano Reservoir specifically, so confirm the current rules before you fish.
Check the official Hawaii fishing regulations →
Upper Helemano Reservoir is about 30 ft (9 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 on Upper Helemano 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 Upper Helemano 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.
Lake Wilson (Wahiawā Reservoir) 2 mi · Kapaia Reservoir 94 mi · Halenanahu Reservoir 95 mi · Waita Reservoir 95 mi · Wailua Reservoir 96 mi · Mauka Reservoir 97 mi · Aepoeha Reservoir 97 mi · Aepo Reservoir 98 mi · Crater Reservoir 98 mi · Waiakalua Reservoir 98 mi · Puu Ka Ele Reservoir 99 mi · Ipuolono Reservoir 100 mi
See how Upper Helemano 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
Browse all Hawaii fishing maps or 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.