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629-acre reservoir near Fort Klamath. The lake tops out around 160 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. Below is the species-by-species picture, pulled from the same data the map uses.
On the chart, Fourmile Lake draws 704 acres inside 6.6 miles of shoreline. The shoreline is moderately structured (index 1.8) — enough points and pockets to pattern. The shallow band under 15 ft claims about 11% of the surface — that's where the groceries are. Tip to tip the water measures near 2.2 mi with a 0.9-mi widest point. The water lies in Klamath County. For a second option, Fish Lake lies 7 mi southwest.
In spring, rainbow trout run shallow here, mostly 5 to 20 ft. Midsummer fish sit out in 8 to 30 ft before dropping to 8 to 40 ft for winter. Spring rainbow trout concentrate at Main-lake point, a prime-rated point around 13 ft. Fish it in early morning and the evening and you'll meet the bite. You won't need more than a dodger + spoon (deep troll) or a flutter spoon most summer days.
| Season | Depth | Best window | Start at | Go-to baits |
|---|---|---|---|---|
| Spring | 5 to 20 ft | dawn & dusk | Main-lake point (13 ft) | Inline spinner (silver), Small spoon |
| Summer | 8 to 30 ft | dawn & dusk | Main-lake point (13 ft) | Dodger + spoon (deep troll), Flutter spoon |
| Fall | 10 to 35 ft | dawn & dusk | Main-lake point (13 ft) | Casting spoon, Jerkbait over shoals |
| Winter | 8 to 40 ft | dawn | Break off the point (114 ft) | Jigging spoon, Tube jig (white) |
Structure-wise the chart holds 6 features, led in depth by Deep basin at roughly 160 ft.
Access data: Oregon State Marine Board — Boating Access. Confirm conditions and fees locally before you launch.
Season dates, license requirements, and size and bag limits for Oregon waters are set by the Oregon Department of Fish and Wildlife — and special regulations can apply to Fourmile Lake specifically, so confirm the current rules before you fish.
Check the official Oregon fishing regulations →
Fourmile Lake is about 160 ft (49 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 rainbow trout on Fourmile Lake.
Main-lake point is the top-rated area: a point in about 13 ft of water that rates prime for rainbow trout in spring. Every other rated spot, per species and season, is on the map above.
For rainbow 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 Fourmile Lake is regulated by the Oregon Department of Fish and Wildlife. Check the official Oregon regulations for current license requirements, season dates, and size and bag limits — special regulations can apply to this specific water.
Fish Lake 7 mi · Lake of the Woods 7 mi · Agency Lake 16 mi · Howard Prairie Lake 18 mi · Crater Lake 34 mi · Squaw Lakes 49 mi · Miller Lake 55 mi · Rogue River 62 mi · Gerber Reservoir 62 mi · Klamath River 66 mi, CA · Crescent Lake 71 mi · Campbell Lake 78 mi, CA
See how Fourmile Lake stacks up: best rainbow trout lakes in Oregon
More water nearby: Klamath County fishing maps (6 charts). Browse all Oregon 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.