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Fishing Diamond Lake Upper: what the data says
5-acre lake near Boulder County. The lake tops out around 17 ft. The contours are modeled from the water's real shoreline and maximum depth. Treat them as a rough guide, and never use them for navigation. What follows comes from the same scoring engine that paints the spots above.
Cutthroat Trout fishing at Diamond Lake Upper
Start shallow in spring: cutthroat trout sit in 3 to 15 ft that time of year. By summer they slide out to 5 to 17 ft, and by winter most fish are in 4 to 17 ft. If you only fish one area, make it Break off the point: a drop-off around 8 ft that scores prime in summer. In summer the feeding windows fall in early morning and the evening. A trolled spoon (small) or a inline spinner covers the summer program.
| Season | Depth | Best window | Go-to baits |
|---|---|---|---|
| Spring | 3 to 15 ft | dawn & dusk | Inline spinner (silver/gold), Small spoon |
| Summer | 5 to 17 ft | dawn & dusk | Trolled spoon (small), Inline spinner |
| Fall | 3 to 17 ft | dawn & dusk | Casting spoon, Inline spinner |
| Winter | 4 to 17 ft | dawn | Small jigging spoon, Marabou jig |
Notable structure
- Deep basin: deep basin, around 14 ft
- Main-lake point: point, around 8 ft
- Break off the point: drop-off, around 8 ft
Common questions
How deep is Diamond Lake Upper?
Diamond Lake Upper is about 17 ft 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.
What fish are in Diamond Lake Upper?
Anglers target cutthroat trout on Diamond Lake Upper.
Where is the best fishing spot 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. Open the map above to see every rated spot for each species and season.
When is the best time to fish Diamond Lake Upper?
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.
Nearby waters
Woodland Lake · Bob Lake · Crater Lake #1, Upper · Meadow Creek Reservoir · Monarch Lake · Barker Reservoir
See how Diamond Lake Upper stacks up: best cutthroat trout lakes in Colorado
Browse all Colorado fishing maps or every water on DepthScout. How we build these maps. For fishing guidance only, never navigation.