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Rating depth structure for largemouth bass.
Shared by DepthScout anglers. Exact spots stay private, always.
3,225-acre reservoir near Portersville. The centerpiece of Moraine State Park north of Pittsburgh, a shallow, fertile lake famous for muskie and largemouth. The lake tops out around 35 ft. Depth here is modeled from the true shoreline and max depth rather than surveyed; use it to plan, not to navigate. The rest of this page walks each species through its year, using the map's own scoring.
The outline encloses 2,898 acres, worked by 40.8 miles of shoreline — 2 islands included. With a shoreline index of 5.4, this water is all arms and coves — edge habitat well beyond its acreage. The shallow band under 15 ft claims about 84% of the surface on the model — that's where the groceries are. The basin spans about 6.1 mi end to end and 4.1 mi across at its widest. It sits in Butler County. Shenango River Lake sits 31 mi northwest — the closest neighbouring chart.
Come spring, look for muskellunge tight to the bank in 3 to 12 ft. Expect a summer slide to 8 to 25 ft, then a winter hold in 15 to 35 ft. Start at Break off the point. It's a drop-off holding about 16 ft of water and rates prime come fall. Prime time lands in the evening and early morning. A double-10 bucktail or a topwater (walk-the-dog / creeper) is the honest summer answer here.
| Season | Depth | Best window | Start at | Go-to baits |
|---|---|---|---|---|
| Spring | 3 to 12 ft | dusk | Shallow bay flat (4 ft) | Smaller bucktail (#8 blades), 6" glide bait |
| Summer | 8 to 25 ft | dusk & dawn | Main-lake point (9 ft) | Double-10 bucktail, Topwater (walk-the-dog / creeper) |
| Fall | 8 to 30 ft | midday & dusk | Break off the point (16 ft) | Big rubber (Bull Dawg style), 10"+ glide bait |
| Winter | 15 to 35 ft | midday | Deep basin (30 ft) | Large rubber, crawled slow |
Come spring, look for largemouth bass tight to the bank in 2 to 10 ft. They move out to 8 to 20 ft in summer and finish the year down in 15 to 35 ft. If you only fish one area, make it Shallow bay flat: a weed flat around 4 ft that scores prime in spring. Best bite is early morning and the evening. A texas-rigged 10" worm or a deep-diving crankbait is the honest summer answer here.
| 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 (16 ft) | Texas-rigged 10" worm, Deep-diving crankbait |
| Fall | 4 to 15 ft | midday & dawn | Main-lake point (9 ft) | Squarebill crankbait (shad), Spinnerbait |
| Winter | 15 to 35 ft | midday | Break off the point (16 ft) | Blade bait, Jigging spoon |
In spring, walleye run shallow here, mostly 4 to 15 ft. Midsummer fish sit out in 15 to 35 ft before dropping to 11 to 35 ft for winter. Spring walleye concentrate at Creek inflow, a prime-rated inflow / creek mouth around 4 ft. Fish it in the evening and early morning and you'll meet the bite. You won't need more than a crawler harness on bottom bouncer or a deep crankbait (trolled) most summer days.
| Season | Depth | Best window | Start at | Go-to baits |
|---|---|---|---|---|
| Spring | 4 to 15 ft | dusk & dawn | Creek inflow (4 ft) | 1/8 oz jig + minnow, Hair jig |
| Summer | 15 to 35 ft | dusk & dawn | Break off the point (16 ft) | Crawler harness on bottom bouncer, Deep crankbait (trolled) |
| Fall | 11 to 35 ft | dusk & night | Break off the point (16 ft) | Jigging rap, Jig + big minnow |
| Winter | 11 to 35 ft | dusk & dawn | Deep basin (30 ft) | Jigging spoon + minnow head, Rattle bait |
When the water first warms, crappie slide up into 2 to 8 ft. Summer is a 10 to 25 ft game here, winter a 15 to 35 ft one. Start at Deep basin. It's a deep basin holding about 30 ft of water and rates prime come winter. The feeding windows run early morning and the evening. Keep a jig trolled/spider-rigged or a small crankbait (trolled) rigged through the warm months.
| Season | Depth | Best window | Start at | Go-to baits |
|---|---|---|---|---|
| Spring | 2 to 8 ft | midday & dawn | Shallow bay flat (4 ft) | 1/16 oz jig + tube, Curly-tail grub |
| Summer | 10 to 25 ft | dawn & dusk | Break off the point (16 ft) | Jig trolled/spider-rigged, Small crankbait (trolled) |
| Fall | 8 to 20 ft | dawn | Break off the point (16 ft) | Jig + minnow combo, Small swimbait (1.5-2") |
| Winter | 15 to 35 ft | midday | Deep basin (30 ft) | Tungsten jig + soft plastic, Tiny jigging spoon |
Come spring, look for channel catfish tight to the bank in 3 to 12 ft. They move out to 8 to 25 ft in summer and finish the year down in 11 to 35 ft. If you only fish one area, make it Creek inflow: an inflow / creek mouth around 4 ft that scores prime in spring. Best bite is after dark and the evening.
| Season | Depth | Best window | Start at | Go-to baits |
|---|---|---|---|---|
| Spring | 3 to 12 ft | dusk | Creek inflow (4 ft) | |
| Summer | 8 to 25 ft | night & dusk | Feeding flat (9 ft) | |
| Fall | 10 to 30 ft | dusk | Deep basin (30 ft) | |
| Winter | 11 to 35 ft | midday | Deep basin (30 ft) |
When the water first warms, white bass & hybrids slide up into 3 to 15 ft. Summer is a 10 to 30 ft game here, winter an 11 to 35 ft one. Start at Creek inflow. It's an inflow / creek mouth holding about 4 ft of water and rates prime come spring. The feeding windows run early morning and the evening. Keep a jigging spoon or a topwater (when schooling) rigged through the warm months.
| Season | Depth | Best window | Start at | Go-to baits |
|---|---|---|---|---|
| Spring | 3 to 15 ft | midday & dawn | Creek inflow (4 ft) | Rooster tail / inline spinner, Curly-tail jig (white/chartreuse) |
| Summer | 10 to 30 ft | dawn & dusk | Main-lake point (9 ft) | Jigging spoon, Topwater (when schooling) |
| Fall | 8 to 25 ft | midday & dawn | Main-lake point (9 ft) | Small blade bait, Jigging spoon |
| Winter | 11 to 35 ft | midday | Deep basin (30 ft) | Jigging spoon, Blade bait (vertical) |
Count 22 structure marks on this chart. The deepest, Deep basin, sits near 30 ft.
Season dates, license requirements, and size and bag limits for Pennsylvania waters are set by the Pennsylvania Fish & Boat Commission — and special regulations can apply to Lake Arthur specifically, so confirm the current rules before you fish.
Check the official Pennsylvania fishing regulations →
Lake Arthur is about 35 ft (11 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 muskellunge, largemouth bass, walleye, crappie, channel catfish, white bass & hybrids on Lake Arthur.
Break off the point is the top-rated area: a drop-off in about 16 ft of water that rates prime for muskellunge in fall. Scroll up to the map for the complete spot list by species and season.
For muskellunge, the summer bite is best in the evening 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 Lake Arthur is regulated by the Pennsylvania Fish & Boat Commission. Check the official Pennsylvania regulations for current license requirements, season dates, and size and bag limits — special regulations can apply to this specific water.
Shenango River Lake 31 mi · Ohio River - New Cumberland Pool 34 mi, OH/WV · Tomlinson Run Lake 39 mi, WV · Highlandtown Lake 42 mi, OH · Guilford Lake 43 mi, OH · Mosquito Creek Lake 46 mi, OH · Conneaut Lake 48 mi · Lake Milton 49 mi, OH · Pymatuning Reservoir 49 mi, OH/PA · Jefferson Lake 51 mi, OH · Berlin Lake 51 mi, OH · Ohio River - Pike Island Pool 52 mi, OH/WV
See how Lake Arthur stacks up: best largemouth bass lakes in Pennsylvania · best walleye lakes in Pennsylvania · best crappie lakes in Pennsylvania · best channel catfish lakes in Pennsylvania
Browse all Pennsylvania 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.