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Rating depth structure for brook trout.
Recent public catches load as you reach this section.
13-acre lake near Cook County. The lake tops out around 45 ft. The depth picture is modeled, anchored to the true shoreline and the water's published max depth — a scouting aid, never a chart to run a boat by. What the data behind the map says about each species, season by season:
On the chart, Olga draws 13 acres inside 0.6 miles of shoreline. Nearly circular (index 1.2), so the story is the bottom, not the bank. Roughly 20% of the water is 15 ft or less as modeled, the band where the food chain lives. The water lies in Cook County. The nearest mapped water is Esther, 1 mi to the northeast.
The spring pattern is a shallow one: brook trout in 2 to 15 ft. Midsummer fish sit out in 10 to 30 ft before dropping to 3 to 20 ft for winter. The spot to know is Shoreline break, a drop-off in about 20 ft of water that rates prime for brook trout in summer. Plan around early morning and the evening in the warm months. Summer baits: a small spoon fished deep or a trolled lake-clear wobbler + worm gets it done.
| Season | Depth | Best window | Start at | Go-to baits |
|---|---|---|---|---|
| Spring | 2 to 15 ft | dawn & dusk | Shallow bay flat (5 ft) | Small inline spinner (gold), Tiny spoon |
| Summer | 10 to 30 ft | dawn & dusk | Shoreline break (20 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 (20 ft) | Small jigging spoon, Tungsten jig + plastic |
Start shallow in spring: splake sit in 5 to 25 ft that time of year. Summer pushes them deeper, 14 to 45 ft, and winter fish settle into 10 to 45 ft. The spot to know is Shoreline break, a drop-off in about 20 ft of water that rates prime for splake in summer. Warm-month bites cluster around early morning and the evening. Throw a trolled spoon at the thermocline or a white tube jig (deep) until the fish tell you otherwise.
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 | 5 to 25 ft | dawn & dusk | Shoreline break (20 ft) | Small casting spoon (gold/orange), Inline spinner |
| Summer | 14 to 45 ft chart-limited; documented 25 to 60 ft | dawn & dusk | Shoreline break (20 ft) | Trolled spoon at the thermocline, White tube jig (deep) |
| Fall | 10 to 35 ft | dawn & dusk | Shoreline break (20 ft) | Casting spoon, Jerkbait |
| Winter | 10 to 45 ft | dawn | Shoreline break (20 ft) | Jigging spoon tipped with minnow head, Small white tube |
Count 4 structure marks on this chart. The deepest, Deep basin, sits near 38 ft.
| Date | Species | Count | Size |
|---|---|---|---|
| 2024* | Splake (fingerlings) | 1,200 | — |
* 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 Olga specifically, so confirm the current rules before you fish.
Check the official Minnesota fishing regulations →
Olga is about 45 ft (14 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, splake on Olga.
Shoreline break is the top-rated area: a drop-off in about 20 ft of water that rates prime for splake 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, Olga was most recently stocked 2024 with 1,200 splake (fingerlings). The full stocking history is listed above.
Fishing on Olga 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.
Esther 1 mi · Edith 1 mi · Devilfish 2 mi · Chester 2 mi · Sunfish 2 mi · Greenwood 3 mi · Margaret 3 mi · Loft 3 mi · North Shady 4 mi · Tom 4 mi · Stump 5 mi · Tomato 5 mi
See how Olga stacks up: best brook trout lakes in Minnesota · best splake 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.