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Rating depth structure for rainbow trout.
Recent public catches load as you reach this section.
544-acre reservoir near Dolores County. The lake tops out around 97 ft. The depth chart comes from U.S. Geological Survey bathymetric survey data, so the contours are survey-derived rather than computer-modeled. 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 8% of this chart. 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. 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 | open water | Trolled spoon (small), Inline spinner |
| Fall | 5 to 25 ft | dawn & dusk | open water | Casting spoon, Inline spinner |
| Winter | 10 to 40 ft | dawn | open water | 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. 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 | open water | Inline spinner (silver), Small spoon |
| Summer | 8 to 30 ft | dawn & dusk | open water | Dodger + spoon (deep troll), Flutter spoon |
| Fall | 10 to 35 ft | dawn & dusk | open water | Casting spoon, Jerkbait over shoals |
| Winter | 8 to 40 ft | dawn | open water | Jigging spoon, Tube jig (white) |
Structure-wise the chart holds 7 features, led in depth by Deep basin at roughly 92 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 97 ft (30 m) deep at its deepest point. The depth chart comes from U.S. Geological Survey bathymetric survey data, so the contours are survey-derived rather than computer-modeled.
Anglers target cutthroat trout, rainbow trout on Groundhog Reservoir.
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. See every water on DepthScout. Bathymetry credit: U.S. Geological Survey. 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.