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3,550-acre reservoir near Senecaville. The lake tops out around 22 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. Here's the year, species by species, as the scoring engine sees it.
Drawn out, this is 3,473 acres of water rimmed by 37.9 miles of bank. With a shoreline index of 4.6, this water is all arms and coves — edge habitat well beyond its acreage. The shallow band under 15 ft claims about 73% of the surface — that's where the groceries are. The basin spans about 5.9 mi end to end and 2.8 mi across at its widest. You'll find it in Noble County. Closest neighbour on DepthScout: Wolf Run Lake, 11 mi southwest of here.
In spring, largemouth bass run shallow here, mostly 2 to 10 ft. Midsummer fish sit out in 8 to 20 ft before dropping to 7 to 22 ft for winter. Spring largemouth bass concentrate at Shallow bay flat, a prime-rated weed flat around 2 ft. Fish it in early morning and the evening and you'll meet the bite. You won't need more than a texas-rigged 10" worm or a deep-diving crankbait most summer days.
| 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 | Sharp break (7 ft) | Texas-rigged 10" worm, Deep-diving crankbait |
| Fall | 4 to 15 ft | midday & dawn | Shoreline point (5 ft) | Squarebill crankbait (shad), Spinnerbait |
| Winter | 7 to 22 ft | midday | Sharp break (7 ft) | Blade bait, Jigging spoon |
Spring puts crappie in skinny water — 2 to 8 ft is the zone. Warm water sends them out to 7 to 22 ft; cold water stacks them in 7 to 22 ft. Deep basin is the standout, a deep basin at roughly 20 ft, rated prime for winter crappie. Plan around early morning and the evening in the warm months. A jig trolled/spider-rigged or a small crankbait (trolled) covers the summer program.
| Season | Depth | Best window | Start at | Go-to baits |
|---|---|---|---|---|
| Spring | 2 to 8 ft | midday & dawn | Shallow bay flat (2 ft) | 1/16 oz jig + tube, Curly-tail grub |
| Summer | 7 to 22 ft | dawn & dusk | Sharp break (7 ft) | Jig trolled/spider-rigged, Small crankbait (trolled) |
| Fall | 8 to 20 ft | dawn | Deep basin (20 ft) | Jig + minnow combo, Small swimbait (1.5-2") |
| Winter | 7 to 22 ft | midday | Deep basin (20 ft) | Tungsten jig + soft plastic, Tiny jigging spoon |
The spring pattern is a shallow one: bluegill in 1 to 6 ft. Midsummer fish sit out in 4 to 15 ft before dropping to 7 to 22 ft for winter. The spot to know is Shallow bay flat, a weed flat in about 2 ft of water that rates prime for bluegill in spring. Plan around early morning and the evening in the warm months. Summer baits: a small sponge spider (fly) or a micro tube jig gets it done.
| 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 (5 ft) | Small sponge spider (fly), Micro tube jig |
| Fall | 6 to 18 ft | midday | Back-bay flat (5 ft) | Micro jig + waxworm, Small spoon tipped |
| Winter | 7 to 22 ft | midday | Deep basin (20 ft) | Tungsten ice jig + plastic, Tiny spoon |
In spring, channel catfish run shallow here, mostly 3 to 12 ft. Midsummer fish sit out in 7 to 22 ft before dropping to 7 to 22 ft for winter. Winter channel catfish concentrate at Deep basin, a prime-rated deep basin around 20 ft. Fish it in after dark and the evening and you'll meet the bite.
| Season | Depth | Best window | Start at | Go-to baits |
|---|---|---|---|---|
| Spring | 3 to 12 ft | dusk | Back-bay flat (5 ft) | |
| Summer | 7 to 22 ft | night & dusk | Deep basin (20 ft) | |
| Fall | 7 to 22 ft | dusk | Deep basin (20 ft) | |
| Winter | 7 to 22 ft | midday | Deep basin (20 ft) |
Start shallow in spring: flathead catfish sit in 5 to 20 ft that time of year. Warm water sends them out to 6 to 22 ft; cold water stacks them in 7 to 22 ft. Top water on the chart: Deep basin, a deep basin in the 20 ft range, prime in fall. Fish it in after dark and the evening and you'll meet the bite.
| Season | Depth | Best window | Start at | Go-to baits |
|---|---|---|---|---|
| Spring | 5 to 20 ft | night & dusk | Deep basin (20 ft) | |
| Summer | 6 to 22 ft | night & dusk | Deep basin (20 ft) | |
| Fall | 6 to 22 ft | night & dusk | Deep basin (20 ft) | |
| Winter | 7 to 22 ft | midday | Deep basin (20 ft) |
When the water first warms, saugeye slide up into 3 to 12 ft. Summer is an 8 to 22 ft game here, winter a 7 to 22 ft one. Start at Gravel shoal. It's a gravel shoal holding about 3 ft of water and rates prime come spring. The feeding windows run the evening and early morning. Keep a crawler harness (shallow) or a jig + crawler rigged through the warm months.
| Season | Depth | Best window | Start at | Go-to baits |
|---|---|---|---|---|
| Spring | 3 to 12 ft | dusk & dawn | Gravel shoal (3 ft) | 1/8 oz jig + twister tail, Blade bait |
| Summer | 8 to 22 ft | dusk & dawn | Sharp break (7 ft) | Crawler harness (shallow), Jig + crawler |
| Fall | 6 to 22 ft | dusk & dawn | Sharp break (7 ft) | Blade bait, Jigging rap |
| Winter | 7 to 22 ft | dusk & dawn | Deep basin (20 ft) | Jigging spoon + minnow head, Blade bait |
Seneca Lake also holds blue catfish (6 to 22 ft in summer). Pick any of them on the map above for rated spots and bait picks.
Count 16 structure marks on this chart. The deepest, Deep basin, sits near 20 ft.
Access data: Ohio DNR — Boater & Stream Access. Confirm conditions and fees locally before you launch.
Season dates, license requirements, and size and bag limits for Ohio waters are set by the Ohio DNR Division of Wildlife — and special regulations can apply to Seneca Lake specifically, so confirm the current rules before you fish.
Check the official Ohio fishing regulations →
Seneca Lake is about 22 ft (7 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 largemouth bass, crappie, bluegill, channel catfish, flathead catfish, saugeye, blue catfish on Seneca Lake.
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. Scroll up to the map for the complete spot list by species and season.
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 Seneca Lake is regulated by the Ohio DNR Division of Wildlife. Check the official Ohio regulations for current license requirements, season dates, and size and bag limits — special regulations can apply to this specific water.
Wolf Run Lake 11 mi · Slope Creek Reservoir (Barnesville #3) 12 mi · Barnesville #4 Lake 12 mi · Monroe Lake 14 mi · Salt Fork Lake 15 mi · Muskingum River 19 mi · Piedmont Lake 20 mi · Ohio Power Company Pond Mb-46 20 mi · Ohio Power Company Pond 9515-004 21 mi · Belmont Lake 22 mi · Ohio Power Company Pond 9515-001 22 mi · Cutler Lake 25 mi
See how Seneca Lake stacks up: best largemouth bass lakes in Ohio · best saugeye lakes in Ohio · best crappie lakes in Ohio · best bluegill lakes in Ohio
Browse all Ohio 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.