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Rating depth structure for brook trout.
Recent public catches load as you reach this section.
47-acre lake near Cook County. The lake tops out around 28 ft. Depth here is modeled from the true shoreline and max depth rather than surveyed; use it to plan, not to navigate. Here's the year, species by species, as the scoring engine sees it.
Topper maps at 47 acres behind 1.2 miles of shoreline. Nearly circular (index 1.3), so the story is the bottom, not the bank. 43% of the surface is littoral (under ~15 ft), per the model — cover, weeds and forage water. Tip to tip the water measures near 0.5 mi with a 0.3-mi widest point. It sits in Cook County. Its nearest charted neighbour, Mayhew, is 1 mi to the southwest.
When the water first warms, brook trout slide up into 2 to 15 ft. By summer they slide out to 8 to 28 ft, and by winter most fish are in 3 to 20 ft. If you only fish one area, make it Deep basin: a deep basin around 24 ft that scores prime in summer. In summer the feeding windows fall in early morning and the evening. Keep a small spoon fished deep or a trolled lake-clear wobbler + worm rigged through the warm months.
Depth note: when a documented seasonal range extends below this chart, the table shows the deepest mapped working water, not a verified holding depth.
| Season | Depth | Best window | Start at | Go-to baits |
|---|---|---|---|---|
| Spring | 2 to 15 ft | dawn & dusk | Shallow bay flat (3 ft) | Small inline spinner (gold), Tiny spoon |
| Summer | 8 to 28 ft chart-limited; documented 10 to 30 ft | dawn & dusk | Deep basin (24 ft) | Small spoon fished deep, Trolled lake-clear wobbler + worm |
| Fall | 2 to 15 ft | midday & dawn | open water | Small spoon (orange), Spinner |
| Winter | 3 to 20 ft | dawn | Shoreline break (13 ft) | Small jigging spoon, Tungsten jig + plastic |
Count 4 structure marks on this chart. The deepest, Deep basin, sits near 24 ft.
| Date | Species | Count | Size |
|---|---|---|---|
| 2025* | Brook Trout (fingerlings) | 2,500 | — |
| 2024* | Brook Trout (fingerlings) | 2,500 | — |
* Approximate date (agency reports month or season only). Source: Minnesota DNR LakeFinder stocking reports, retrieved 2026-09-11.
Season dates, license requirements, and size and bag limits for Minnesota waters are set by the Minnesota DNR — and special regulations can apply to Topper specifically, so confirm the current rules before you fish.
Check the official Minnesota fishing regulations →
Topper is about 28 ft (9 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 brook trout on Topper.
Deep basin is the top-rated area: a deep basin in about 24 ft of water that rates prime for brook trout in summer. Every other rated spot, per species and season, is on the map above.
For brook trout, 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.
Yes — per Minnesota DNR LakeFinder stocking reports records, Topper was most recently stocked 2025 with 2,500 brook trout (fingerlings). The full stocking history is listed above.
Fishing on Topper is regulated by the Minnesota DNR. Check the official Minnesota regulations for current license requirements, season dates, and size and bag limits — special regulations can apply to this specific water.
Mayhew 1 mi · South 1 mi · East Pope 1 mi · Sock 1 mi · Surber 1 mi · West Pope 2 mi · North 2 mi · Portage 2 mi · Iron 2 mi · Birch 2 mi · Dunn 2 mi · Little Mayhew 3 mi
See how Topper stacks up: best brook trout lakes in Minnesota
More water nearby: Cook County fishing maps (351 charts). Browse all Minnesota fishing maps. 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.