Blackduck Lake
Beltrami County, Minnesota, near Blackduck. DNR lake ID 04006900.
Blackduck Lake is a 2,711-acre lake in Beltrami County, Minnesota, near Blackduck. Its deepest point reaches 28 ft, and about 51% of the lake is shallower than 15 feet. Summer water clarity averages 7.5 feet in Minnesota Pollution Control Agency monitoring, which places it in the eutrophic nutrient class. The DNR lists it for faucet snail, starry stonewort. DNR surveys document walleye, northern pike, largemouth bass, black crappie, bluegill, yellow perch.
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Quick facts
| DNR lake ID | 04006900 |
|---|---|
| County | Beltrami County, near Blackduck |
| Surface area | 2,711 acres |
| Maximum depth | 28 ft |
| Share under 15 ft | 51% |
| Water clarity (summer) | 7.5 ft through 2025 |
| Phosphorus (summer) | 35.7 µg/L |
| Algae, chlorophyll-a (summer) | 19.1 µg/L |
| Nutrient class | Eutrophic |
| Clarity trend | Steady (2016 to 2025) |
| Invasive species | faucet snail, starry stonewort |
| Public water accesses | 2 |
Water quality
Summer averages from Minnesota Pollution Control Agency monitoring through 2025: clarity 7.5 ft, phosphorus 35.7 µg/L, algae (chlorophyll-a) 19.1 µg/L. Using the Carlson trophic state index, Blackduck Lake rates as eutrophic. Summer clarity trend 2016 to 2025: steady.
Fishing on Blackduck Lake
The most recent DNR standard fish survey was in 2021 (5 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 | 12.73 | 3.3 to 8.8 |
| Northern pike | gill | 9.2 | 2.8 to 9.0 |
| Yellow perch | gill | 21.93 | 7.0 to 46.3 |
| Black crappie | gill | 0.13 | 0.4 to 2.7 |
| Bluegill | gill | 0.8 | n/a |
| Pumpkinseed | gill | 0.33 | n/a |
| Rock bass | gill | 0.27 | 0.6 to 3.9 |
Walleye catch was above the typical range for similar lakes in that survey.
Largest fish measured in recent DNR samples: Walleye 27.0 in (2021), Northern pike 37.0 in (2021), Largemouth bass 18.0 in (2018).
Game and panfish documented since 2005: Walleye, Northern pike, Largemouth bass, Black crappie, Bluegill, Yellow perch, Pumpkinseed, Hybrid sunfish, Rock bass, Lake whitefish, Burbot, Shorthead redhorse, White sucker, Brown 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
On the Minnesota DNR infested waters list for: faucet snail (listed 2018), starry stonewort (listed 2023).
Public boat access
- Blackduck Lake, Pine Tree Park: 2 concrete slab launch ramps, 1 dock, 22 trailer spaces. 2 miles west of Blackduck, off CSAH 30 just south of Couty Park on east shore. Directions
- Blackduck Lake, West: 1 concrete slab launch ramp, 1 dock, 9 trailer spaces. North of Town of Hines take Hines Rd NE then Creek Ct NE Directions
DNR water access records (2023). Confirm current conditions with the DNR.
Nearby lakes
- Dutchman Lake 4.2 mi, Beltrami County
- Hanson Lake 4.4 mi, Beltrami County
- Erickson Lake 4.9 mi, Beltrami County
- Medicine Lake 5.6 mi, Beltrami County
- Nelson Lake 5.8 mi, Beltrami County
- Gilstad Lake 5.9 mi, Beltrami County
- Gull Lake 6.4 mi, Beltrami County
- Carter Lake 6.5 mi, Beltrami County
Questions about Blackduck Lake
How deep is Blackduck Lake?
Blackduck Lake reaches a maximum depth of 28 ft according to Minnesota DNR records. About 51% of the lake is shallower than 15 feet.
How big is Blackduck Lake?
Blackduck Lake covers about 2,711 acres in Beltrami County, Minnesota.
How clear is Blackduck Lake?
Summer water clarity on Blackduck Lake averages 7.5 feet (Secchi depth) in MPCA monitoring through 2025. Its trophic state is eutrophic.
Does Blackduck Lake have zebra mussels or other invasive species?
The Minnesota DNR infested waters list includes Blackduck Lake for faucet snail, starry stonewort.
What fish are in Blackduck Lake?
Minnesota DNR surveys document walleye, northern pike, largemouth bass, black crappie, bluegill, yellow perch, pumpkinseed, hybrid sunfish, rock bass, lake whitefish in Blackduck Lake. The most recent standard survey was in 2021.
Where is the public boat access on Blackduck Lake?
Blackduck Lake has 2 public water access sites on DNR record: Blackduck Lake, Pine Tree Park; Blackduck Lake, West.
How is the walleye population on Blackduck Lake?
In Minnesota DNR net surveys from 1991 to 2021, walleye numbers on Blackduck Lake ran mostly above 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 Blackduck Lake?
Homes on Blackduck 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 Blackduck Lake and nearby lakes, including off-market opportunities when available.
What is it like to live on Blackduck Lake?
Big water with room for long boat rides and wake sports, about 51% shallow shoreline under 15 feet, and summer clarity around 7.5 feet. Conditions vary by property, so walk the frontage and ask us what similar homes have sold for.
Are there special fishing regulations on Blackduck Lake?
No lake-specific regulation was found for Blackduck Lake in Minnesota Rules or the DNR sunfish list. Statewide and zone regulations apply.
Ask us about Blackduck Lake
Whether you’re buying, selling, or just curious, our team works Beltrami County lakes every day. Send us a note or call (218) 656-6469.
Sources: Minnesota DNR LakeFinder records, DNR fish surveys (latest 2021), 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.