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22-acre lake in Noble County, Indiana. The lake tops out around 70 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.
Shoreline on the chart totals 1.6 miles. Nearly circular (index 1.2), so the story is the bottom, not the bank. The shallow band under 15 ft claims about 23% of the surface — that's where the groceries are. Figure 0.6 mi of water from one end to the other, 0.3 mi at the beam. It sits in Noble County. Lower Long Lake sits 5 mi south — the closest neighbouring chart.
Early season bluegill use the shallows, holding in 1 to 6 ft. Expect a summer slide to 4 to 15 ft, then a winter hold in 10 to 25 ft. Put Back-bay flat first on the milk run — a weed flat near 5 ft that grades prime for spring. In summer the feeding windows fall in early morning and the evening. Tie on a small sponge spider (fly) or a micro tube jig and you're in the game.
| Season | Depth | Best window | Start at | Go-to baits |
|---|---|---|---|---|
| Spring | 1 to 6 ft | midday & dusk | Back-bay flat (5 ft) | 1/32 oz jig + micro plastic, Tiny popper (evenings) |
| Summer | 4 to 15 ft | dawn & dusk | Shallow bay flat (7 ft) | Small sponge spider (fly), Micro tube jig |
| Fall | 6 to 18 ft | midday | Shallow bay flat (7 ft) | Micro jig + waxworm, Small spoon tipped |
| Winter | 10 to 25 ft | midday | Break off the point (11 ft) | Tungsten ice jig + plastic, Tiny spoon |
The chart marks 5 structure features on Diamond Lake; the deepest is Deep basin at about 69 ft.
Access data: Indiana DNR — Fishing Access Sites. Confirm conditions and fees locally before you launch.
Season dates, license requirements, and size and bag limits for Indiana waters are set by the Indiana DNR — and special regulations can apply to Diamond Lake specifically, so confirm the current rules before you fish.
Check the official Indiana fishing regulations →
Diamond Lake is about 70 ft (21 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 bluegill on Diamond Lake.
Back-bay flat is the top-rated area: a weed flat in about 5 ft of water that rates prime for bluegill in spring. The map above holds the full rated-spot list for every species and season.
For bluegill, 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 Diamond Lake is regulated by the Indiana DNR. Check the official Indiana regulations for current license requirements, season dates, and size and bag limits — special regulations can apply to this specific water.
Lower Long Lake 5 mi · Village Lake 8 mi · Barbara Lake 8 mi · Duely Lake 8 mi · Williams Lake 8 mi · Bear Lake 8 mi · Harper Lake 8 mi · Gordy Lake 8 mi · Skinner Lake 8 mi · Messick Lake 9 mi · Rivir Lake 9 mi · Dallas Lake 9 mi
See how Diamond Lake stacks up: best bluegill lakes in Indiana
More water nearby: Noble County fishing maps (14 charts). Browse all Indiana 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.