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5-acre lake near Boulder County. The lake tops out around 17 ft. Bathymetry on this water is estimated from its real outline and maximum depth. Use it to shortlist water, then verify with your electronics — and never navigate by it. Here's the year, species by species, as the scoring engine sees it.
The drawn water covers 6 acres wrapped in 0.5 miles of bank. A shoreline index of 1.3 says round and simple: fish relate to depth changes here, not shoreline features. The shallow band under 15 ft claims about 63% of the surface on the model — that's where the groceries are. Boulder County claims this one. Its nearest charted neighbour, Woodland Lake, is 3 mi to the south.
Spring puts cutthroat trout in skinny water — 3 to 15 ft is the zone. As the season builds they drop to 5 to 17 ft, wintering in 4 to 17 ft. Summer cutthroat trout concentrate at Break off the point, a prime-rated drop-off around 8 ft. Warm-month bites cluster around early morning and the evening. A trolled spoon (small) or an inline spinner covers the summer program.
| Season | Depth | Best window | Start at | Go-to baits |
|---|---|---|---|---|
| Spring | 3 to 15 ft | dawn & dusk | Main-lake point (8 ft) | Inline spinner (silver/gold), Small spoon |
| Summer | 5 to 17 ft | dawn & dusk | Break off the point (8 ft) | Trolled spoon (small), Inline spinner |
| Fall | 3 to 17 ft | dawn & dusk | Main-lake point (8 ft) | Casting spoon, Inline spinner |
| Winter | 4 to 17 ft | dawn | Break off the point (8 ft) | Small jigging spoon, Marabou jig |
Structure-wise the chart holds 3 features, led in depth by Deep basin at roughly 14 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 Diamond Lake Upper specifically, so confirm the current rules before you fish.
Check the official Colorado fishing regulations →
Diamond Lake Upper is about 17 ft (5 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 on Diamond Lake Upper.
Break off the point is the top-rated area: a drop-off in about 8 ft of water that rates prime for cutthroat trout in summer. 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 Diamond Lake Upper 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.
Woodland Lake 3 mi · Bob Lake 3 mi · Meadow Creek Reservoir 6 mi · Crater Lake #1, Upper 6 mi · Monarch Lake 9 mi · Barker Reservoir 10 mi · Granby Reservoir 14 mi · Gross Reservoir 16 mi · Shadow Mountain Reservoir 19 mi · Willow Creek Reservoir 19 mi · Grand Lake 19 mi · Button Rock Res 22 mi
See how Diamond Lake Upper stacks up: best cutthroat trout lakes in Colorado
More water nearby: Boulder County fishing maps (8 charts). 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.