Minnesota DNR fisheries surveys · latest July 26, 1993
Diamond Lake FishingDWater-quality grade D
Minnesota DNR surveys at Diamond Lake average 5.22 bluegill per unit of sampling effort (CPUE) across 1 survey. The most recent is a Standard Survey dated July 26, 1993. Length samples in the latest survey that recorded them ran 3–7 inches. In Hennepin County, Minnesota, Diamond Lake carries an overall water-quality grade of D. The survey figures on this page are Minnesota DNR's own; the water-quality grade comes from EPA Water Quality Portal samples. Neither is a forecast of today's bite.
Species recorded at Diamond Lake
7 species on the Minnesota DNR list for this lake. A species on the list has been recorded here; it does not mean it is catchable today or in every part of the lake.
Stocking at Diamond Lake
No stocking record for Diamond Lake appears in the Minnesota DNR material on file. That is an absence in the published record, not a confirmation that the lake is unstocked — some waters are managed as naturally reproducing and never appear in a stocking list at all.
Survey results in full
Minnesota DNR surveys at Diamond Lake average 5.22 bluegill per unit of sampling effort (CPUE) across 1 survey. The most recent is a Standard Survey dated July 26, 1993. Length samples in the latest survey that recorded them ran 3–7 inches.
A DNR fisheries survey reports fish abundance and catch rates, not a water-quality grade. LakeQuality grades Diamond Lake D from EPA Water Quality Portal chemistry, and the water-quality trend over 6 years of monitoring is declining. Catch rate is not a swim clearance and is not a weekly bite report.
DNR Fisheries Survey Summary
1 survey on file from MN DNR Fisheries. Most recent: 1993-07-26 (Standard Survey).
Top Species by Catch Rate
| Species | Avg catch rate (CPUE) | Avg Weight |
|---|---|---|
| Black Bullhead | 6.78 | 0.11 lb |
| Bluegill | 5.22 | 0.11 lb |
| Common Carp | 4.11 | 2.44 lb |
| Green Sunfish | 3.00 | 0.09 lb |
| Hybrid Sunfish | 0.67 | 0.12 lb |
CPUE = catch per unit effort, averaged across surveys (excludes juvenile shoreline seining). Higher CPUE means more abundant in standardized sampling. This is not a weekly bite report.
Length Distributions
Number of fish caught at each inch class in the most recent survey that recorded lengths. Red dashed line marks an approximate trophy threshold for that species.
Black Bullhead
Bluegill
Common Carp
Green Sunfish
From the 1993-07-26 survey
The current fish population is dominated by black bullhead, carp, bluegill, and green sunfish. The bluegill population in Diamond lake is average compared to other lakes of the same classification. Their weight is considered slightly less than average. Over half of the bluegills measured were between 4 and 5.5 inches…
DNR Reports & Resources
Minnesota DNR LakeFinder publishes lake survey, fish stocking, water access, and aquatic plant data for Diamond Lake. 1 report on file.
These links open on the official state DNR websites (Wisconsin DNR survey PDFs · Minnesota DNR LakeFinder).
- —Fisheries Lake Survey — DiamondFisheries Lake Survey · MN DNR LakeFinder
Common questions
What fish are in Diamond Lake?
Minnesota DNR surveys at Diamond Lake average 5.22 bluegill per unit of sampling effort (CPUE) across 1 survey. The most recent is a Standard Survey dated July 26, 1993. Length samples in the latest survey that recorded them ran 3–7 inches. Minnesota DNR lists 7 species for the lake in total. Those are survey results, not a catch report: a net set on one date measures what was in that net.
When was Diamond Lake last surveyed?
The most recent fisheries survey on file for Diamond Lake is dated July 26, 1993. Survey intervals vary by lake and by species; a gap of several years between surveys is normal and does not mean the record is missing.
Is Diamond Lake stocked?
No stocking record for Diamond Lake appears in the Minnesota DNR material on file. That is not the same as a confirmed unstocked lake: it means no stocking document was published for it in the records this page draws on.
Does the water-quality grade tell me how Diamond Lake fishes?
A DNR fisheries survey reports fish abundance and catch rates, not a water-quality grade. LakeQuality grades Diamond Lake D from EPA Water Quality Portal chemistry, and the water-quality trend over 6 years of monitoring is declining. Catch rate is not a swim clearance and is not a weekly bite report.
Before you eat what you catch
A water-quality grade is not a consumption advisory. Mercury and PCB advice for Minnesota waters comes from MDH, and it is issued per species and per size class — a lake can grade well and still carry a meal limit on larger predator fish.
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