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318-acre reservoir near Jackson Region. The lake tops out around 103 ft. Depth here is modeled from the true shoreline and max depth rather than surveyed; use it to plan, not to navigate. What follows comes from the same scoring engine that paints the spots above.
The outline encloses 310 acres, worked by 4.3 miles of shoreline. A middling shoreline index (1.7) gives it some bays to work without being a maze. 36% of the surface is littoral (under ~15 ft), per the model — cover, weeds and forage water. Figure 1.8 mi of water from one end to the other, 0.6 mi at the beam. Teton County claims this one. Its nearest charted neighbour, Tillery Lake, is 2 mi to the west.
Start shallow in spring: cutthroat trout sit in 3 to 15 ft that time of year. Summer pushes them deeper, 10 to 35 ft, and winter fish settle into 10 to 40 ft. The spot to know is Main-lake point, a point in about 26 ft of water that rates prime for cutthroat trout in summer. Warm-month bites cluster around early morning and the evening. Throw a trolled spoon (small) or an inline spinner until the fish tell you otherwise.
| Season | Depth | Best window | Start at | Go-to baits |
|---|---|---|---|---|
| Spring | 3 to 15 ft | dawn & dusk | open water | Inline spinner (silver/gold), Small spoon |
| Summer | 10 to 35 ft | dawn & dusk | Main-lake point (26 ft) | Trolled spoon (small), Inline spinner |
| Fall | 5 to 25 ft | dawn & dusk | Main-lake point (26 ft) | Casting spoon, Inline spinner |
| Winter | 10 to 40 ft | dawn | Main-lake point (26 ft) | Small jigging spoon, Marabou jig |
Early season lake trout use the shallows, holding in 10 to 40 ft. Summer is a 31 to 103 ft game here, winter a 20 to 80 ft one. The chart's best answer is Deep basin — deep basin, 88 ft, prime for summer. Best bite is early morning. Tie on a white tube jig (deep) or a magnum spoon on downrigger and you're in the game.
| Season | Depth | Best window | Start at | Go-to baits |
|---|---|---|---|---|
| Spring | 10 to 40 ft | dawn & dusk | Main-lake point (26 ft) | Casting spoon over shoals, Jerkbait (shallow) |
| Summer | 31 to 103 ft | dawn | Deep basin (88 ft) | White tube jig (deep), Magnum spoon on downrigger |
| Fall | 10 to 50 ft | dusk & dawn | Main-lake point (26 ft) | Heavy casting spoon, Jigging rap over reefs |
| Winter | 20 to 80 ft | dawn | Break off the point (46 ft) | White tube jig, Airplane jig |
Come spring, look for rainbow trout tight to the bank in 5 to 20 ft. They move out to 8 to 30 ft in summer and finish the year down in 8 to 40 ft. If you only fish one area, make it Main-lake point: a point around 26 ft that scores prime in fall. Best bite is early morning and the evening. A dodger + spoon (deep troll) or a flutter spoon is the honest summer answer here.
| Season | Depth | Best window | Start at | Go-to baits |
|---|---|---|---|---|
| Spring | 5 to 20 ft | dawn & dusk | Shallow bay flat (6 ft) | Inline spinner (silver), Small spoon |
| Summer | 8 to 30 ft | dawn & dusk | Main-lake point (26 ft) | Dodger + spoon (deep troll), Flutter spoon |
| Fall | 10 to 35 ft | dawn & dusk | Main-lake point (26 ft) | Casting spoon, Jerkbait over shoals |
| Winter | 8 to 40 ft | dawn | Break off the point (46 ft) | Jigging spoon, Tube jig (white) |
Structure-wise the chart holds 6 features, led in depth by Deep basin at roughly 88 ft.
Season dates, license requirements, and size and bag limits for Wyoming waters are set by the Wyoming Game and Fish Department — and special regulations can apply to Grassy Lake Reservoir specifically, so confirm the current rules before you fish.
Check the official Wyoming fishing regulations →
Grassy Lake Reservoir is about 103 ft (31 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 cutthroat trout, lake trout, rainbow trout on Grassy Lake Reservoir.
Deep basin is the top-rated area: a deep basin in about 88 ft of water that rates prime for lake trout in summer. Open the map above to see every rated spot for each 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 Grassy Lake Reservoir is regulated by the Wyoming Game and Fish Department. Check the official Wyoming regulations for current license requirements, season dates, and size and bag limits — special regulations can apply to this specific water.
Tillery Lake 2 mi · Fish Lake 7 mi · Lewis Lake 15 mi · Jackson Lake 16 mi · Hidden Lake (Hell & Gone) 18 mi · Two Ocean Lake 20 mi · Bearpaw Lake 21 mi · Holly Lake 23 mi · Lake Solitude 23 mi · Jenny Lake 25 mi · Snake River (Jackson) 27 mi · Elk Ranch Reservoir 28 mi
See how Grassy Lake Reservoir stacks up: best rainbow trout lakes in Wyoming · best lake trout lakes in Wyoming · best cutthroat trout lakes in Wyoming
More water nearby: Teton County fishing maps (16 charts). Browse all Wyoming fishing maps or 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.