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544-acre reservoir near Dolores County. The lake tops out around 90 ft. Contours on this water are modeled from its actual shoreline and max depth. Good for finding likely water, never for navigation. What follows comes from the same scoring engine that paints the spots above.
The outline encloses 546 acres, worked by 8.4 miles of shoreline — one island included. With a shoreline index of 2.6, this water is all arms and coves — edge habitat well beyond its acreage. Littoral water — the productive band under ~15 ft — makes up 46% of this chart, as modeled. Tip to tip the water measures near 1.8 mi with a 1.1-mi widest point. It sits in Dolores County. McPhee Reservoir sits 22 mi southwest — the closest neighbouring chart.
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 23 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 | open water | Inline spinner (silver/gold), Small spoon |
| Summer | 10 to 35 ft | dawn & dusk | Main-lake point (23 ft) | Trolled spoon (small), Inline spinner |
| Fall | 5 to 25 ft | dawn & dusk | Main-lake point (23 ft) | Casting spoon, Inline spinner |
| Winter | 10 to 40 ft | dawn | Break off the point (41 ft) | Small jigging spoon, Marabou jig |
Spring rainbow trout on Groundhog Reservoir hold shallow, usually 5 to 20 ft. By summer they slide out to 8 to 30 ft, and by winter most fish are in 8 to 40 ft. The chart's best answer is Break off the point — drop-off, 41 ft, prime for winter. Prime time lands in early morning and the evening. The summer box starts with a dodger + spoon (deep troll) or a flutter spoon.
| 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 (23 ft) | Dodger + spoon (deep troll), Flutter spoon |
| Fall | 10 to 35 ft | dawn & dusk | Main-lake point (23 ft) | Casting spoon, Jerkbait over shoals |
| Winter | 8 to 40 ft | dawn | Break off the point (41 ft) | Jigging spoon, Tube jig (white) |
Structure-wise the chart holds 6 features, led in depth by Deep basin at roughly 77 ft.
Season dates, license requirements, and size and bag limits for Colorado waters are set by the Colorado Parks & Wildlife — and special regulations can apply to Groundhog Reservoir specifically, so confirm the current rules before you fish.
Check the official Colorado fishing regulations →
Groundhog Reservoir is about 90 ft (27 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, rainbow trout on Groundhog Reservoir.
Main-lake point is the top-rated area: a point in about 23 ft of water that rates prime for cutthroat trout in fall. Scroll up to the map for the complete spot list by 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 Groundhog Reservoir is regulated by the Colorado Parks & Wildlife. Check the official Colorado regulations for current license requirements, season dates, and size and bag limits — special regulations can apply to this specific water.
McPhee Reservoir 22 mi · Trout Lake 23 mi · Puett Reservoir 27 mi · Andrews Lake 33 mi · Lemon Reservoir 44 mi · Silverjack Reservoir 51 mi · Road Canyon Reservoir 54 mi · San Cristobal Lake 56 mi · Lloyds Lake 58 mi, UT · Crystal Reservoir 61 mi · Recapture Reservoir 63 mi, UT · Monticello Lake 64 mi, UT
See how Groundhog Reservoir stacks up: best rainbow trout lakes in Colorado · best cutthroat trout lakes in Colorado
Browse all Colorado 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.