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129.7-acre reservoir near Forestburgh. The lake tops out around 20 ft. The depth chart is built from real state fisheries GPS surveys, so the humps, channels and drop-offs you see are measured, not guessed. What the data behind the map says about each species, season by season:
Mongaup Falls Reservoir maps at 105 acres behind 3.3 miles of shoreline. The 2.3 development index tells the story — a convoluted bank whose fishable edge far outruns the acreage. About 88% of the surface sits shallower than 15 ft — that's the weed-and-bait zone. The basin spans about 1.4 mi end to end and 0.4 mi across at its widest. Its nearest charted neighbour, Rio Reservoir, is 3 mi to the south.
Spring puts brown trout in skinny water — 2 to 20 ft is the zone. Summer fish stay in 6 to 20 ft, and winter fish hold in 3 to 20 ft. Break off the point is the standout, a drop-off at roughly 18 ft, rated prime for summer brown trout. Plan around after dark and early morning in the warm months. A spoon at the thermocline or a deep stickbait (night) covers the summer program.
| Season | Depth | Best window | Start at | Go-to baits |
|---|---|---|---|---|
| Spring | 2 to 20 ft | dawn & dusk | Main-lake point (11 ft) | Stickbait off planer boards (shallow), Small spoon along mud lines |
| Summer | 6 to 20 ft | night & dawn | Break off the point (18 ft) | Spoon at the thermocline, Deep stickbait (night) |
| Fall | 3 to 20 ft | dusk & dawn | Main-lake point (11 ft) | Jerkbait over gravel, Casting spoon |
| Winter | 3 to 20 ft | dawn | Break off the point (18 ft) | Jigging spoon, Small stickbait (slow) |
When the water first warms, largemouth bass slide up into 2 to 10 ft. Summer is an 8 to 20 ft game here, winter a 6 to 20 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 early morning and the evening. Keep a texas-rigged 10" worm or a deep-diving crankbait rigged through the warm months.
| 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 (18 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 | 6 to 20 ft | midday | Break off the point (18 ft) | Blade bait, Jigging spoon |
Come spring, look for smallmouth bass tight to the bank in 3 to 12 ft. They move out to 6 to 20 ft in summer and finish the year down in 6 to 20 ft. If you only fish one area, make it Main-lake point: a point around 11 ft that scores prime in fall. Best bite is early morning and the evening. A drop shot (goby/minnow) or a ned rig is the honest summer answer here.
| Season | Depth | Best window | Start at | Go-to baits |
|---|---|---|---|---|
| Spring | 3 to 12 ft | dawn & dusk | Main-lake point (11 ft) | Ned rig, Tube jig |
| Summer | 6 to 20 ft | dawn & dusk | Break off the point (18 ft) | Drop shot (goby/minnow), Ned rig |
| Fall | 6 to 20 ft | midday & dawn | Main-lake point (11 ft) | Jerkbait, Blade bait |
| Winter | 6 to 20 ft | midday | Break off the point (18 ft) | Blade bait, Hair jig |
Mongaup Falls Reservoir carries 6 mapped structure features, topping out (or rather bottoming out) at Deep basin, about 20 ft down.
Access data: New York State DEC — Boat Launches (FishNY). Confirm conditions and fees locally before you launch.
Season dates, license requirements, and size and bag limits for New York waters are set by the New York DEC — and special regulations can apply to Mongaup Falls Reservoir specifically, so confirm the current rules before you fish.
Check the official New York fishing regulations →
Mongaup Falls Reservoir is about 20 ft (6 m) deep at its deepest point. The depth chart here comes from real state fisheries GPS surveys, so the contours reflect measured depths.
Anglers target brown trout, largemouth bass, smallmouth bass on Mongaup Falls 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. Scroll up to the map for the complete spot list by species and season.
For brown trout, the summer bite is best in after dark and early morning. Each species page section below lists the seasonal windows, and the map shows a live NOW badge when you're inside one.
Fishing on Mongaup Falls Reservoir is regulated by the New York DEC. Check the official New York regulations for current license requirements, season dates, and size and bag limits — special regulations can apply to this specific water.
Rio Reservoir 3 mi · Highland Lake 4 mi · Swinging Bridge Reservoir 5 mi · Toronto Reservoir 7 mi · Lake Superior 10 mi · White Lake 10 mi · Anawana Lake 12 mi · Mastens Lake 13 mi · Lake Huntington 14 mi · Morningside Lake 16 mi · Mashipacong Pond 19 mi, NJ · Laurel Lake 21 mi, PA
See how Mongaup Falls Reservoir stacks up: best largemouth bass lakes in New York · best smallmouth bass lakes in New York · best brown trout lakes in New York
Browse all New York fishing maps or see every water on DepthScout. Bathymetry credit: state fisheries survey programs. 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.