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Rating depth structure for largemouth bass.
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371-acre reservoir near Patillas. A PREPA hydro reservoir (1914) below the Cordillera Central in southeast Puerto Rico, stocked with largemouth and butterfly peacock bass over tilapia and sunfish. The lake tops out around 61 ft. The depth chart comes from U.S. Geological Survey bathymetric survey data, so the contours are survey-derived rather than computer-modeled. The season-by-season read for each species follows, from the map's own numbers.
On the chart, Lago Patillas draws 280 acres inside 5.7 miles of shoreline. An index of 2.4 puts the bank firmly in maze territory: point after pocket after cove, every one a casting target. The shallow band under 15 ft claims about 36% of the surface — that's where the groceries are. Tip to tip the water measures near 1.4 mi with a 0.8-mi widest point. The water lies in Patillas County. For a second option, Puerto Patillas lies 4 mi south.
Start shallow in spring: largemouth bass sit in 2 to 10 ft that time of year. Summer pushes them deeper, 8 to 20 ft, and winter fish settle into 15 to 35 ft. The spot to know is Shallow bay flat, a weed flat in about 2 ft of water that rates prime for largemouth bass in spring. Warm-month bites cluster around early morning and the evening. Throw a texas-rigged 10" worm or a deep-diving crankbait until the fish tell you otherwise.
| Season | Depth | Best window | Start at | Go-to baits |
|---|---|---|---|---|
| Spring | 2 to 10 ft | dawn & dusk | Shallow bay flat (2 ft) | Spinnerbait, Chatterbait |
| Summer | 8 to 20 ft | dawn & dusk | Back-bay flat (8 ft) | Texas-rigged 10" worm, Deep-diving crankbait |
| Fall | 4 to 15 ft | midday & dawn | Main-lake point (11 ft) | Squarebill crankbait (shad), Spinnerbait |
| Winter | 15 to 35 ft | midday | Break off the point (45 ft) | Blade bait, Jigging spoon |
The spring pattern is a shallow one: peacock bass (tucunaré) in 2 to 12 ft. Midsummer fish sit out in 3 to 15 ft before dropping to 6 to 22 ft for winter. The spot to know is Main-lake point, a point in about 11 ft of water that rates prime for peacock bass (tucunaré) in spring. Plan around midday and early morning in the warm months. Summer baits: a topwater (walking bait) or a jerkbait gets it done.
| Season | Depth | Best window | Start at | Go-to baits |
|---|---|---|---|---|
| Spring | 2 to 12 ft | midday & dawn | Main-lake point (11 ft) | Topwater prop bait, Jerkbait (fire tiger) |
| Summer | 3 to 15 ft | midday & dawn | Main-lake point (11 ft) | Topwater (walking bait), Jerkbait |
| Fall | 3 to 15 ft | midday & dawn | Main-lake point (11 ft) | Jerkbait, Swimbait |
| Winter | 6 to 22 ft | midday | Main-lake point (11 ft) | Slow jerkbait, Jig |
The spring pattern is a shallow one: tilapia in 1 to 6 ft. As the season builds they drop to 2 to 10 ft, wintering in 5 to 18 ft. Top water on the chart: Shallow bay flat, a weed flat in the 2 ft range, prime in spring. Time it for midday and early morning. Summer baits: a micro-jig near weed edges gets it done.
| Season | Depth | Best window | Start at | Go-to baits |
|---|---|---|---|---|
| Spring | 1 to 6 ft | midday & dusk | Shallow bay flat (2 ft) | Tiny jig + bread-ball tip, Small worm under float |
| Summer | 2 to 10 ft | midday & dawn | Shallow bay flat (2 ft) | Micro-jig near weed edges |
| Fall | 3 to 12 ft | midday | Back-bay flat (8 ft) | Small jig tipped with worm |
| Winter | 5 to 18 ft | midday | Back-bay flat (8 ft) | Slow micro-jig, warm outflows |
Start shallow in spring: channel catfish sit in 3 to 12 ft that time of year. Summer pushes them deeper, 8 to 25 ft, and winter fish settle into 20 to 40 ft. The spot to know is Back-bay flat, a weed flat in about 8 ft of water that rates good for channel catfish in spring. Warm-month bites cluster around after dark and the evening.
| Season | Depth | Best window | Start at | Go-to baits |
|---|---|---|---|---|
| Spring | 3 to 12 ft | dusk | Back-bay flat (8 ft) | |
| Summer | 8 to 25 ft | night & dusk | open water | |
| Fall | 10 to 30 ft | dusk | Deep basin (60 ft) | |
| Winter | 20 to 40 ft | midday | Deep basin (60 ft) |
Spring puts bluegill in skinny water — 1 to 6 ft is the zone. As the season builds they drop to 4 to 15 ft, wintering in 10 to 25 ft. Spring bluegill concentrate at Shallow bay flat, a prime-rated weed flat around 2 ft. Warm-month bites cluster around early morning and the evening. A small sponge spider (fly) or a micro tube jig covers the summer program.
| Season | Depth | Best window | Start at | Go-to baits |
|---|---|---|---|---|
| Spring | 1 to 6 ft | midday & dusk | Shallow bay flat (2 ft) | 1/32 oz jig + micro plastic, Tiny popper (evenings) |
| Summer | 4 to 15 ft | dawn & dusk | Back-bay flat (8 ft) | Small sponge spider (fly), Micro tube jig |
| Fall | 6 to 18 ft | midday | Back-bay flat (8 ft) | Micro jig + waxworm, Small spoon tipped |
| Winter | 10 to 25 ft | midday | Back-bay flat (8 ft) | Tiny spoon |
Structure-wise the chart holds 6 features, led in depth by Deep basin at roughly 60 ft.
Season dates, license requirements, and size and bag limits for Puerto Rico waters are set by the Puerto Rico DRNA — and special regulations can apply to Lago Patillas specifically, so confirm the current rules before you fish.
Check the official Puerto Rico fishing regulations →
Lago Patillas is about 61 ft (19 m) deep at its deepest point. The depth chart comes from U.S. Geological Survey bathymetric survey data, so the contours are survey-derived rather than computer-modeled.
Anglers target largemouth bass, peacock bass (tucunaré), tilapia, channel catfish, bluegill on Lago Patillas.
Shallow bay flat is the top-rated area: a weed flat in about 2 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 Lago Patillas is regulated by the Puerto Rico DRNA. Check the official Puerto Rico regulations for current license requirements, season dates, and size and bag limits — special regulations can apply to this specific water.
Puerto Patillas 4 mi · Lago Carite 6 mi · Bahía de Jobos 13 mi · Lago Loíza 20 mi · Puerto de Humacao 20 mi · Bahía de Rincón 21 mi · Lago La Plata 24 mi · Bahía de Puerto Nuevo 29 mi · Lago Toa Vaca 30 mi · Bahía de San Juan 30 mi · Puerto Medio Mundo 31 mi · Bahía de Puerca 32 mi
See how Lago Patillas stacks up: best largemouth bass lakes in Puerto Rico · best peacock bass (tucunaré) lakes in Puerto Rico · best tilapia lakes in Puerto Rico · best bluegill lakes in Puerto Rico
Browse all Puerto Rico fishing maps or see every water on DepthScout. Bathymetry credit: U.S. Geological Survey. 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.