Diamond Lake
Aitkin County, Minnesota, near Aitkin. DNR lake ID 01017100.
Diamond Lake is an 81.9-acre lake in Aitkin County, Minnesota, near Aitkin. Its deepest point reaches 26 ft, and about 65% of the lake is shallower than 15 feet. Summer water clarity averages 5.8 feet in Minnesota Pollution Control Agency monitoring, which places it in the eutrophic nutrient class. It is not on the DNR infested waters list as of September 2026. DNR surveys document walleye, northern pike, black crappie, bluegill, yellow perch.
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Quick facts
| DNR lake ID | 01017100 |
|---|---|
| County | Aitkin County, near Aitkin |
| Surface area | 81.9 acres |
| Maximum depth | 26 ft |
| Mean depth | 11.0 ft |
| Share under 15 ft | 65% |
| Water clarity (summer) | 5.8 ft through 2017 |
| Phosphorus (summer) | 52.8 µg/L |
| Algae, chlorophyll-a (summer) | 14.4 µg/L |
| Nutrient class | Eutrophic |
| Invasive species | Not on DNR infested waters list (Sept 2026) |
| Public water accesses | 0 |
Water quality
Summer averages from Minnesota Pollution Control Agency monitoring through 2017: clarity 5.8 ft, phosphorus 52.8 µg/L, algae (chlorophyll-a) 14.4 µg/L. Using the Carlson trophic state index, Diamond Lake rates as eutrophic.
Fishing on Diamond Lake
The most recent DNR standard fish survey was in 2013 (13 years ago). Catch per net is compared with the DNR’s typical range for lakes of the same type.
| Species | Net | Catch per net | Typical range |
|---|---|---|---|
| Walleye | gill | 0.67 | 0.5 to 3.0 |
| Northern pike | gill | 6.67 | 4.8 to 12.5 |
| Northern pike | trap | 0.89 | n/a |
| Yellow perch | gill | 11.0 | 2.0 to 21.5 |
| Yellow perch | trap | 0.44 | 0.3 to 2.8 |
| Black crappie | gill | 11.33 | 1.0 to 4.8 |
| Black crappie | trap | 5.33 | 0.8 to 4.3 |
| Bluegill | gill | 2.0 | n/a |
| Bluegill | trap | 24.67 | 8.3 to 50.1 |
| Pumpkinseed | gill | 0.33 | n/a |
| Pumpkinseed | trap | 2.11 | 2.8 to 10.3 |
| Rock bass | gill | 0.33 | 0.3 to 1.2 |
| Rock bass | trap | 0.11 | 0.5 to 1.5 |
| Hybrid sunfish | trap | 0.11 | n/a |
Walleye catch was within the typical range for similar lakes in that survey.
Largest fish measured in recent DNR samples: Northern pike 30.0 in (2013), Walleye 16.0 in (2013), Largemouth bass 2.0 in (1994).
Game and panfish documented since 2005: Walleye, Northern pike, Black crappie, Bluegill, Yellow perch, Pumpkinseed, Hybrid sunfish, Rock bass, Bowfin, Shorthead redhorse, Silver redhorse, White sucker, Yellow bullhead, Brown bullhead, Black bullhead.
Fishing regulations
No lake-specific regulation found in Minnesota Rules or the DNR sunfish list. Statewide and zone regulations apply.
Regulations change. Confirm with the DNR before fishing.
Invasive species
Not on the Minnesota DNR infested waters list as of September 2026. That means no confirmed listing, not a guarantee the lake is free of invasive species.
Public boat access
No public water access on DNR record.
Nearby lakes
- Hanging Kettle Lake 0.7 mi, Aitkin County
- Ripple Lake 1.1 mi, Aitkin County
- Bachelor Lake 1.7 mi, Aitkin County
- Spirit Lake 1.7 mi, Aitkin County
- Lone Lake 2.3 mi, Aitkin County
- Hickory Lake 2.6 mi, Aitkin County
- Raspberry Lake 2.6 mi, Aitkin County
- Nord Lake 2.7 mi, Aitkin County
Questions about Diamond Lake
How deep is Diamond Lake?
Diamond Lake reaches a maximum depth of 26 ft according to Minnesota DNR records. About 65% of the lake is shallower than 15 feet.
How big is Diamond Lake?
Diamond Lake covers about 81.9 acres in Aitkin County, Minnesota.
How clear is Diamond Lake?
Summer water clarity on Diamond Lake averages 5.8 feet (Secchi depth) in MPCA monitoring through 2017. Its trophic state is eutrophic.
Does Diamond Lake have zebra mussels or other invasive species?
Diamond Lake is not on the Minnesota DNR infested waters list as of September 2026. That means there is no confirmed listing; it is not a guarantee the lake is free of invasive species.
What fish are in Diamond Lake?
Minnesota DNR surveys document walleye, northern pike, black crappie, bluegill, yellow perch, pumpkinseed, hybrid sunfish, rock bass, bowfin, shorthead redhorse in Diamond Lake. The most recent standard survey was in 2013.
How is the walleye population on Diamond Lake?
In Minnesota DNR net surveys from 1994 to 2013, walleye numbers on Diamond Lake ran mostly within the typical range for similar lakes. Nets measure how many fish a lake holds, not where they’re biting, so local guides are the best source for current fishing.
Are there lake homes for sale on Diamond Lake?
Homes on Diamond Lake come up for sale throughout the year, and some sell before they’re ever publicly advertised. Tell us what you’re looking for and our agents will run a custom search and send you matching homes on Diamond Lake and nearby lakes, including off-market opportunities when available.
What is it like to live on Diamond Lake?
Small, quiet water suited to paddling and fishing, about 65% shallow shoreline under 15 feet, and summer clarity around 5.8 feet. Conditions vary by property, so walk the frontage and ask us what similar homes have sold for.
Are there special fishing regulations on Diamond Lake?
No lake-specific regulation was found for Diamond Lake in Minnesota Rules or the DNR sunfish list. Statewide and zone regulations apply.
Ask us about Diamond Lake
Whether you’re buying, selling, or just curious, our team works Aitkin County lakes every day. Send us a note or call (218) 656-6469.
Sources: Minnesota DNR LakeFinder records, DNR fish surveys (latest 2013), DNR infested waters list (Sept 2026), Minnesota Rules 6264.0400 (April 2026), MPCA monitoring via the Water Quality Portal, DNR water access records (2023), LAGOS-US. Lakewide information from public data; it does not describe any specific property. Verify shoreline, bottom type, and depth at any frontage.