Sign inSign up free Sign inSign up free Sign inSign up freeShared by DepthScout anglers. Exact spots stay private, always.
34-acre lake in Sweet Grass County, Montana. The lake tops out around 50 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. Every species below gets its seasonal read from the same numbers driving the chart.
The drawn water covers 32 acres wrapped in 1.2 miles of bank. With a 1.5 development index there's bank structure worth casting at, in moderation. Roughly 25% of the water is 15 ft or less, the band where the food chain lives. Tip to tip the water measures near 0.4 mi with a 0.2-mi widest point. It sits in Sweet Grass County. Its nearest charted neighbour, Jordan Lake (Sweet Grass), is 1 mi to the northeast.
In spring, cutthroat trout run shallow here, mostly 3 to 15 ft. Midsummer fish sit out in 10 to 35 ft before dropping to 10 to 40 ft for winter. Fall cutthroat trout concentrate at Main-lake point, a prime-rated point around 19 ft. Fish it in early morning and the evening and you'll meet the bite. You won't need more than a trolled spoon (small) or an inline spinner most summer days.
| Season | Depth | Best window | Start at | Go-to baits |
|---|---|---|---|---|
| Spring | 3 to 15 ft | dawn & dusk | Main-lake point (19 ft) | Inline spinner (silver/gold), Small spoon |
| Summer | 10 to 35 ft | dawn & dusk | Main-lake point (19 ft) | Trolled spoon (small), Inline spinner |
| Fall | 5 to 25 ft | dawn & dusk | Main-lake point (19 ft) | Casting spoon, Inline spinner |
| Winter | 10 to 40 ft | dawn | Break off the point (39 ft) | Small jigging spoon, Marabou jig |
5 pieces of structure are mapped here — Deep basin, around 50 ft, is the deepest of them.
Season dates, license requirements, and size and bag limits for Montana waters are set by the Montana Fish, Wildlife & Parks — and special regulations can apply to Pentad Lake specifically, so confirm the current rules before you fish.
Check the official Montana fishing regulations →
Pentad Lake is about 50 ft (15 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 cutthroat trout on Pentad Lake.
Main-lake point is the top-rated area: a point in about 19 ft of water that rates prime for cutthroat trout in fall. The map above holds the full rated-spot list for every species and season.
For cutthroat 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.
Fishing on Pentad Lake is regulated by the Montana Fish, Wildlife & Parks. Check the official Montana regulations for current license requirements, season dates, and size and bag limits — special regulations can apply to this specific water.
Jordan Lake (Sweet Grass) 1 mi · Fish Lake (Sweet Grass) 2 mi · Wounded Man Lake 3 mi · Owl Lake (Sweet Grass) 4 mi · Rainbow Lake, Upper (Rainbow #2) 4 mi · Mirror Lake 4 mi · Sienna Lake 6 mi · Narrow Escape Lake 6 mi · Lake Surrender 6 mi · Cimmerian Lake 6 mi · Lightning Lake 8 mi · Jasper Lake (Tumble Lake) 9 mi
See how Pentad Lake stacks up: best cutthroat trout lakes in Montana
More water nearby: Sweet Grass County fishing maps (10 charts). Browse all Montana 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.