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Rating depth structure for zander.
Recent public catches load as you reach this section.
4,561-acre lake in Finland. The lake tops out around 65 m. The depth chart comes from Finnish Environment Institute (Syke) bathymetric survey data, so the contours are survey-derived rather than computer-modeled. Here is how the season plays out for each species, straight from the data behind the map.
Kartalla Isojärvi kattaa 1 976 hehtaaria, rantaviivaa 87.5 km. Rantaviiva on voimakkaasti rikkonainen (indeksi 5.6) — lahtia ja niemiä kaikkialla, mikä moninkertaistaa kalastettavan reunan. Noin 27% pinnasta on matalampaa kuin ~5 m — siellä ruokaketju elää. Päästä päähän vesi mittaa noin 19 km, leveimmillään 6.1 km. Vesi sijaitsee alueella Jämsä. Lähin kartoitettu vesi on Pälämä, 6.4 km itään.
Ilmainen interaktiivinen kalastuskartta — Isojärvi, Suomi: syvyyskäyrät todellisista syvyysmittauksista 65 metriin (213 jalkaa) asti, parhaat kalapaikat lajeille ahven, hauki, kuha ja muut. Syvyyskäyrät perustuvat Syken todellisiin syvyysmittauksiin (CC BY 4.0). Käytä karttaa suuntaa-antavana, älä koskaan navigointiin.
In spring, european perch run shallow here, mostly 1 to 3.5 m. Midsummer fish sit out in 2.5 to 8.5 m before dropping to 3.5 to 10 m for winter. Spring european perch concentrate at Back-bay flat, a prime-rated weed flat around 2 m. Fish it in early morning and you'll meet the bite. You won't need more than a drop-shot micro plastics or a small crankbait (perch pattern) most summer days.
| Kausi | Syvyys | Paras aika | Aloita | Vieheet |
|---|---|---|---|---|
| Kevät | 1 to 3.5 m | midday & dawn | Back-bay flat (2 m) | Small jig + curly tail, Inline spinner #1-2 |
| Kesä | 2.5 to 8.5 m | dawn | Break off the point (5.5 m) | Drop-shot micro plastics, Small crankbait (perch pattern) |
| Syksy | 3 to 10 m | midday | Break off the point (5.5 m) | Jigging spoon (small), Drop-shot on deep flats |
| Talvi | 3.5 to 10 m | midday & dawn | Shallow bay flat (5.5 m) | Tungsten jig + maggots, Small balance jig |
In spring, northern pike run shallow here, mostly 0.5 to 2.5 m. Summer pushes them deeper, 2.5 to 6 m, and winter fish settle into 1.5 to 4.5 m. Back-bay flat is the standout, a weed flat at roughly 2 m, rated prime for spring northern pike. Time it for early morning and the evening. You won't need more than a bucktail or a weedless spoon over cabbage most summer days.
| Kausi | Syvyys | Paras aika | Aloita | Vieheet |
|---|---|---|---|---|
| Kevät | 0.5 to 2.5 m | midday & dawn | Back-bay flat (2 m) | #5 inline spinner, Spoon (red/white) |
| Kesä | 2.5 to 6 m | dawn & dusk | Shallow bay flat (5.5 m) | Bucktail, Weedless spoon over cabbage |
| Syksy | 2 to 5.5 m | midday & dawn | Shallow bay flat (5.5 m) | Big rubber (Bull Dawg style), Husky-style jerkbait |
| Talvi | 1.5 to 4.5 m | midday | Back-bay flat (2 m) | Tip-ups, Large jigging spoon |
In spring, zander run shallow here, mostly 1 to 4.5 m. Midsummer fish sit out in 4.5 to 11 m before dropping to 6 to 12 m for winter. Fall zander concentrate at Break off the point, a prime-rated drop-off around 5.5 m. Fish it in the evening and early morning and you'll meet the bite. You won't need more than a vertical softbait over humps or a deep crankbait most summer days.
| Kausi | Syvyys | Paras aika | Aloita | Vieheet |
|---|---|---|---|---|
| Kevät | 1 to 4.5 m | dusk & dawn | Rock reef (2.5 m) | Softbait on jighead (10-12 cm), Shallow crankbait at dusk |
| Kesä | 4.5 to 11 m | dusk & dawn | Break off the point (5.5 m) | Vertical softbait over humps, Deep crankbait |
| Syksy | 3.5 to 12 m | dusk & night | Break off the point (5.5 m) | Big softbait (12-16 cm) slow-rolled, Jigging spoon |
| Talvi | 6 to 12 m | dusk & dawn | Sharp break (12 m) | Vertical jig / mormyshka with bait, Slow blade bait |
Come spring, look for lake whitefish tight to the bank in 4.5 to 14 m. Expect a summer slide to 12 to 27 m, then a winter hold in 7.5 to 21 m. Start at Rock reef. It's a rock pile holding about 2.5 m of water and rates prime come fall. Prime time lands in early morning. A blade bait vertical or a small jigging spoon is the honest summer answer here.
| Kausi | Syvyys | Paras aika | Aloita | Vieheet |
|---|---|---|---|---|
| Kevät | 4.5 to 14 m | midday & dawn | Break off the point (5.5 m) | Small jig + waxworm, Blade bait (small) |
| Kesä | 12 to 27 m | dawn | Sharp break (12 m) | Blade bait vertical, Small jigging spoon |
| Syksy | 2.5 to 9 m | dusk | Rock reef (2.5 m) | Small spoon (gold), Jig + plastic larva |
| Talvi | 7.5 to 21 m | midday & dawn | Sharp break (12 m) | Jigging spoon + bead chain, Tungsten jig + waxie |
The spring pattern is a shallow one: burbot in 7.5 to 21 m. As the season builds they drop to 15 to 37 m, wintering in 4.5 to 18 m. Top water on the chart: Rock reef, a rock pile in the 2.5 m range, prime in winter. Time it for after dark and midday. Summer baits: a heavy jig + cut bait gets it done.
| Kausi | Syvyys | Paras aika | Aloita | Vieheet |
|---|---|---|---|---|
| Kevät | 7.5 to 21 m | night & dusk | Sharp break (12 m) | Glow jigging spoon + cut bait, Rattle bait (dark) |
| Kesä | 15 to 37 m | night & midday | Sharp break (38 m) | Heavy jig + cut bait |
| Syksy | 9 to 24 m | night & dusk | Sharp break (12 m) | Glow spoon + minnow head, Blade bait (slow) |
| Talvi | 4.5 to 18 m | night & dusk | Rock reef (2.5 m) | Glow tungsten + cut bait, Rattle spoon + minnow head |
15 pieces of structure are mapped here — Deep basin, around 62 m, is the deepest of them.
Season dates, license requirements, and size and bag limits for Finland waters are set by the Kalastusrajoitus.fi (official Finnish restriction service) — and special regulations can apply to Isojärvi specifically, so confirm the current rules before you fish.
Check the official Finland fishing regulations →
Isojärvi is about 213 ft (65 m) deep at its deepest point. The depth chart comes from Finnish Environment Institute (Syke) bathymetric survey data, so the contours are survey-derived rather than computer-modeled.
Isojärvi on syvimmillään noin 65 metriä (213 jalkaa). Syvyydet perustuvat todellisiin luotauksiin.
Anglers target european perch, northern pike, zander, lake whitefish, burbot on Isojärvi. This isn't a survey of the water — none is published for it — but an informed estimate from the species common to the region, narrowed by this water's depth, size and each species' range.
Back-bay flat is the top-rated area: a weed flat in about 7 ft of water that rates prime for european perch in spring. The interactive chart above rates every spot for each species and season.
For european perch, the summer bite is best in 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 Isojärvi is regulated by the Kalastusrajoitus.fi (official Finnish restriction service). Check the official Finland regulations for current license requirements, season dates, and size and bag limits — special regulations can apply to this specific water.
Pälämä 4 mi · Pirttijärvi-Riihijärvi 6 mi · Vähä Valkeajärvi 7 mi · Pukarajärvi 7 mi · Hahmajärvi 8 mi · Syväjärvi 10 mi · Kolhinselkä Eväjärvi 11 mi · Pitkävesi 11 mi · Nytkimenjärvi 11 mi · Iso-Löytäne 12 mi · Lopenselkä 12 mi · Äväntäjärvi 13 mi
See how Isojärvi stacks up: best zander lakes in Finland · best northern pike lakes in Finland · best european perch lakes in Finland · best lake whitefish lakes in Finland
More water nearby: Jämsä fishing maps (30 charts). Browse all Finland fishing maps or see every water on DepthScout. Bathymetry credit: Finnish Environment Institute (Syke), Järvien ja jokien syvyysaineisto, CC BY 4.0. 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.