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Fishing Diamond Lake: what the data says
152-acre lake near Poweshiek County. Iowa DNR survey water. The lake tops out around 16 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. What follows comes from the same scoring engine that paints the spots above.
Largemouth Bass fishing at Diamond Lake
Start shallow in spring: largemouth bass sit in 2 to 10 ft that time of year. By summer they slide out to 5 to 16 ft, and by winter most fish are in 5 to 16 ft. If you only fish one area, make it Shallow bay flat: a weed flat around 5 ft that scores prime in spring. In summer the feeding windows fall in early morning and the evening. A texas-rigged 10" worm or a deep-diving crankbait covers the summer program.
| Season | Depth | Best window | Go-to baits |
|---|---|---|---|
| Spring | 2 to 10 ft | dawn & dusk | Spinnerbait, Chatterbait |
| Summer | 5 to 16 ft | dawn & dusk | Texas-rigged 10" worm, Deep-diving crankbait |
| Fall | 4 to 15 ft | midday & dawn | Squarebill crankbait (shad), Spinnerbait |
| Winter | 5 to 16 ft | midday | Blade bait, Jigging spoon |
Bluegill fishing at Diamond Lake
In spring, bluegill run shallow here, mostly 1 to 6 ft. They move out to 4 to 15 ft in summer and finish the year down in 5 to 16 ft. If you only fish one area, make it Shallow bay flat: a weed flat around 5 ft that scores prime in spring. Best bite is early morning and the evening. Summer baits: a small sponge spider (fly) or a micro tube jig gets it done.
| Season | Depth | Best window | Go-to baits |
|---|---|---|---|
| Spring | 1 to 6 ft | midday & dusk | 1/32 oz jig + micro plastic, Tiny popper (evenings) |
| Summer | 4 to 15 ft | dawn & dusk | Small sponge spider (fly), Micro tube jig |
| Fall | 5 to 16 ft | midday | Micro jig + waxworm, Small spoon tipped |
| Winter | 5 to 16 ft | midday | Tungsten ice jig + plastic, Tiny spoon |
Crappie fishing at Diamond Lake
Spring crappie on Diamond Lake hold shallow, usually 2 to 8 ft. By summer they slide out to 5 to 16 ft, and by winter most fish are in 5 to 16 ft. Deep basin is the standout, a deep basin at roughly 16 ft, rated prime for winter crappie. Plan around early morning and the evening in the warm months. Summer baits: a jig trolled/spider-rigged or a small crankbait (trolled) gets it done.
| Season | Depth | Best window | Go-to baits |
|---|---|---|---|
| Spring | 2 to 8 ft | midday & dawn | 1/16 oz jig + tube, Curly-tail grub |
| Summer | 5 to 16 ft | dawn & dusk | Jig trolled/spider-rigged, Small crankbait (trolled) |
| Fall | 5 to 16 ft | dawn | Jig + minnow combo, Small swimbait (1.5-2") |
| Winter | 5 to 16 ft | midday | Tungsten jig + soft plastic, Tiny jigging spoon |
Yellow Perch fishing at Diamond Lake
Spring yellow perch on Diamond Lake hold shallow, usually 3 to 12 ft. They move out to 5 to 16 ft in summer and finish the year down in 5 to 16 ft. The spot to know is Shallow bay flat, a weed flat in about 5 ft of water that rates prime for yellow perch in spring. In summer the feeding windows fall in early morning. A drop-shot micro plastics or a small spoon tipped with worm covers the summer program.
| Season | Depth | Best window | Go-to baits |
|---|---|---|---|
| Spring | 3 to 12 ft | midday & dawn | Small jig + curly tail, Perch-pattern micro crank |
| Summer | 5 to 16 ft | dawn | Drop-shot micro plastics, Small spoon tipped with worm |
| Fall | 5 to 16 ft | midday | Jigging spoon (small), Perch rig / spreader |
| Winter | 5 to 16 ft | midday & dawn | Tungsten jig + spikes, Rattle spoon (small) |
Channel Catfish fishing at Diamond Lake
Start shallow in spring: channel catfish sit in 3 to 12 ft that time of year. By summer they slide out to 5 to 16 ft, and by winter most fish are in 5 to 16 ft. If you only fish one area, make it Deep basin: a deep basin around 16 ft that scores prime in winter. In summer the feeding windows fall in after dark and the evening.
| Season | Depth | Best window | Go-to baits |
|---|---|---|---|
| Spring | 3 to 12 ft | dusk | |
| Summer | 5 to 16 ft | night & dusk | |
| Fall | 5 to 16 ft | dusk | |
| Winter | 5 to 16 ft | midday |
Walleye fishing at Diamond Lake
In spring, walleye run shallow here, mostly 4 to 15 ft. They move out to 5 to 16 ft in summer and finish the year down in 5 to 16 ft. If you only fish one area, make it Break off the point: a drop-off around 6 ft that scores prime in fall. In summer the feeding windows fall in the evening and early morning. Tie on a crawler harness on bottom bouncer or a deep crankbait (trolled) and you're in the game.
| Season | Depth | Best window | Go-to baits |
|---|---|---|---|
| Spring | 4 to 15 ft | dusk & dawn | 1/8 oz jig + minnow, Hair jig |
| Summer | 5 to 16 ft | dusk & dawn | Crawler harness on bottom bouncer, Deep crankbait (trolled) |
| Fall | 5 to 16 ft | dusk & night | Jigging rap, Jig + big minnow |
| Winter | 5 to 16 ft | dusk & dawn | Jigging spoon + minnow head, Rattle bait |
Notable structure
- Deep basin: deep basin, around 16 ft
- Break off the point: drop-off, around 6 ft
- Shallow bay flat: weed flat, around 5 ft
- Main-lake point: point, around 2 ft
- Secondary point: point, around 2 ft
- Back-bay flat: weed flat, around 2 ft
Common questions
How deep is Diamond Lake?
Diamond Lake is about 16 ft at its deepest point. The depth chart here comes from real state fisheries GPS surveys, so the contours reflect measured depths.
What fish are in Diamond Lake?
Anglers target largemouth bass, walleye, crappie, bluegill, channel catfish, yellow perch on Diamond Lake.
Where is the best fishing spot on Diamond Lake?
Shallow bay flat is the top-rated area: a weed flat in about 5 ft of water that rates prime for largemouth bass in spring. Open the map above to see every rated spot for each species and season.
When is the best time to fish Diamond Lake?
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.
Nearby waters
Hawthorn Lake · Arbor Lake · Lake Keomah · White Oak Conservation Area Lake · Rock Creek Lake · Iowa Lake (Iowa Co.)
See how Diamond Lake stacks up: best largemouth bass lakes in Iowa · best walleye lakes in Iowa · best crappie lakes in Iowa · best bluegill lakes in Iowa
Browse all Iowa fishing maps or every water on DepthScout. Bathymetry credit: state fisheries survey programs. How we build these maps. For fishing guidance only, never navigation.