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1,102.3-acre reservoir near Hillsboro. The lake tops out around 24 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. Species by species, here's what the data says the year looks like.
Traced from the shoreline, Lake Glenn Shoals runs 1,081 acres with 24.7 miles of edge. The 5.4 development index tells the story — a convoluted bank whose fishable edge far outruns the acreage. The shallow band under 15 ft claims about 78% of the surface — that's where the groceries are. The basin spans about 4.5 mi end to end and 1.9 mi across at its widest. The water lies in Montgomery County. The nearest mapped water is Lake Lou Yaeger, 7 mi to the west.
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 7 to 24 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 (9 ft) | Texas-rigged 10" worm, Deep-diving crankbait |
| Fall | 4 to 15 ft | midday & dawn | Main-lake point (7 ft) | Squarebill crankbait (shad), Spinnerbait |
| Winter | 7 to 24 ft | midday | Break off the point (4 ft) | Blade bait, Jigging spoon |
The spring pattern is a shallow one: smallmouth bass in 3 to 12 ft. As the season builds they drop to 7 to 24 ft, wintering in 7 to 24 ft. Top water on the chart: Main-lake point, a point in the 7 ft range, prime in fall. Time it for early morning and the evening. Summer baits: a drop shot (goby/minnow) or a ned rig gets it done.
| Season | Depth | Best window | Start at | Go-to baits |
|---|---|---|---|---|
| Spring | 3 to 12 ft | dawn & dusk | Main-lake point (7 ft) | Ned rig, Tube jig |
| Summer | 7 to 24 ft | dawn & dusk | Main-lake point (7 ft) | Drop shot (goby/minnow), Ned rig |
| Fall | 7 to 24 ft | midday & dawn | Main-lake point (7 ft) | Jerkbait, Blade bait |
| Winter | 7 to 24 ft | midday | Break off the point (4 ft) | Blade bait, Hair jig |
The spring pattern is a shallow one: crappie in 2 to 8 ft. As the season builds they drop to 7 to 24 ft, wintering in 7 to 24 ft. Top water on the chart: Deep basin, a deep basin in the 23 ft range, prime in winter. Time it for early morning and the evening. Summer baits: a jig trolled/spider-rigged or a small crankbait (trolled) gets it done.
| 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 24 ft | dawn & dusk | Back-bay flat (9 ft) | Jig trolled/spider-rigged, Small crankbait (trolled) |
| Fall | 8 to 20 ft | dawn | Back-bay flat (9 ft) | Jig + minnow combo, Small swimbait (1.5-2") |
| Winter | 7 to 24 ft | midday | Deep basin (23 ft) | Tungsten jig + soft plastic, Tiny jigging spoon |
Start shallow in spring: channel catfish sit in 3 to 12 ft that time of year. Summer pushes them deeper, 7 to 24 ft, and winter fish settle into 7 to 24 ft. The spot to know is Deep basin, a deep basin in about 23 ft of water that rates prime for channel catfish in winter. 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 (9 ft) | |
| Summer | 7 to 24 ft | night & dusk | Deep basin (23 ft) | |
| Fall | 7 to 24 ft | dusk | Deep basin (23 ft) | |
| Winter | 7 to 24 ft | midday | Deep basin (23 ft) |
The spring pattern is a shallow one: white bass & hybrids in 3 to 15 ft. As the season builds they drop to 7 to 24 ft, wintering in 7 to 24 ft. Top water on the chart: Main-lake point, a point in the 7 ft range, prime in fall. Time it for early morning and the evening. Summer baits: a jigging spoon or a topwater (when schooling) gets it done.
| Season | Depth | Best window | Start at | Go-to baits |
|---|---|---|---|---|
| Spring | 3 to 15 ft | midday & dawn | Main-lake point (7 ft) | Rooster tail / inline spinner, Curly-tail jig (white/chartreuse) |
| Summer | 7 to 24 ft | dawn & dusk | Main-lake point (7 ft) | Jigging spoon, Topwater (when schooling) |
| Fall | 7 to 24 ft | midday & dawn | Main-lake point (7 ft) | Small blade bait, Jigging spoon |
| Winter | 7 to 24 ft | midday | Deep basin (23 ft) | Jigging spoon, Blade bait (vertical) |
Early season sauger use the shallows, holding in 4 to 18 ft. Summer is a 7 to 24 ft game here, winter a 7 to 24 ft one. The chart's best answer is Deep basin — deep basin, 23 ft, prime for winter. Best bite is early morning and the evening. Tie on a bottom bouncer + crawler or a 3-way rig with stickbait and you're in the game.
| Season | Depth | Best window | Start at | Go-to baits |
|---|---|---|---|---|
| Spring | 4 to 18 ft | dawn & dusk | Main-lake point (7 ft) | 3/8 oz jig + ringworm, Hair jig + minnow |
| Summer | 7 to 24 ft | dawn & dusk | Break off the point (4 ft) | Bottom bouncer + crawler, 3-way rig with stickbait |
| Fall | 7 to 24 ft | dusk & dawn | Break off the point (4 ft) | Jig + big minnow, Blade bait |
| Winter | 7 to 24 ft | dusk | Deep basin (23 ft) | Heavy jigging spoon, Jig + minnow (vertical) |
Count 7 structure marks on this chart. The deepest, Deep basin, sits near 23 ft.
Access data: OpenStreetMap contributors (ODbL) — community-mapped launches. Confirm conditions and fees locally before you launch.
Season dates, license requirements, and size and bag limits for Illinois waters are set by the Illinois DNR — and special regulations can apply to Lake Glenn Shoals specifically, so confirm the current rules before you fish.
Check the official Illinois fishing regulations →
Lake Glenn Shoals is about 24 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, smallmouth bass, crappie, channel catfish, white bass & hybrids, sauger on Lake Glenn Shoals.
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. The interactive chart above rates every spot for each 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 Lake Glenn Shoals is regulated by the Illinois DNR. Check the official Illinois regulations for current license requirements, season dates, and size and bag limits — special regulations can apply to this specific water.
Lake Lou Yaeger 7 mi · Carlinville Lake 21 mi · Taylorville Lake 22 mi · Sunset Lake 26 mi · Sangchris Lake 27 mi · Otter Lake 27 mi · Lake Springfield 36 mi · Carlyle Lake 37 mi · Greenfield Lake 40 mi · Lake Altamont 42 mi · Sara Lake 44 mi · Sangamon River 46 mi
See how Lake Glenn Shoals stacks up: best largemouth bass lakes in Illinois · best smallmouth bass lakes in Illinois · best sauger lakes in Illinois · best crappie lakes in Illinois
Browse all Illinois 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.