Big Deep Lake
Cass County, Minnesota, near Hackensack. DNR lake ID 11027700.
Big Deep Lake is a 535.8-acre lake in Cass County, Minnesota, near Hackensack. Its deepest point reaches 107 ft, and about 9% of the lake is shallower than 15 feet. Summer water clarity averages 18.8 feet in Minnesota Pollution Control Agency monitoring, which places it in the oligotrophic nutrient class. It is not on the DNR infested waters list as of September 2026.
Buying or selling on Big Deep Lake? Ask us what lakeshore here actually sells for, which stretches of shoreline buyers compete for, and what’s coming up before it’s listed.
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Quick facts
| DNR lake ID | 11027700 |
|---|---|
| County | Cass County, near Hackensack |
| Surface area | 535.8 acres |
| Maximum depth | 107 ft |
| Share under 15 ft | 9% |
| Water clarity (summer) | 18.8 ft through 2025 |
| Phosphorus (summer) | 8.0 µg/L |
| Algae, chlorophyll-a (summer) | 2.2 µg/L |
| Nutrient class | Oligotrophic |
| Clarity trend | Steady (2016 to 2025) |
| 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 2025: clarity 18.8 ft, phosphorus 8.0 µg/L, algae (chlorophyll-a) 2.2 µg/L. Using the Carlson trophic state index, Big Deep Lake rates as oligotrophic. Summer clarity trend 2016 to 2025: steady.
Fishing on Big Deep Lake
The most recent DNR standard fish survey was in 1995 (31 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 | 1.56 | 1.0 to 5.0 |
| Walleye | trap | 0.11 | 0.2 to 0.7 |
| Northern pike | gill | 15.0 | 2.2 to 8.7 |
| Northern pike | trap | 0.33 | n/a |
| Yellow perch | gill | 0.67 | 1.5 to 13.8 |
| Black crappie | gill | 0.11 | 0.3 to 1.7 |
| Bluegill | gill | 1.44 | n/a |
| Bluegill | trap | 9.78 | 7.7 to 43.4 |
| Largemouth bass | gill | 0.33 | 0.5 to 1.7 |
| Largemouth bass | trap | 0.22 | 0.4 to 1.5 |
| Smallmouth bass | trap | 0.11 | 0.2 to 0.8 |
| Pumpkinseed | gill | 1.56 | n/a |
| Pumpkinseed | trap | 0.44 | 1.4 to 5.9 |
| Rock bass | gill | 1.44 | 0.7 to 4.4 |
| Rock bass | trap | 1.89 | 0.8 to 3.7 |
Walleye catch was within the typical range for similar lakes in that survey.
Largest fish measured in recent DNR samples: Walleye 24.0 in (1995), Smallmouth bass 5.0 in (1995), Northern pike 31.0 in (1995), Largemouth bass 14.0 in (1995).
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
- Trillium Lake 1.5 mi, Cass County
- Long Lake 2.0 mi, Cass County
- Sand Lake 2.1 mi, Cass County
- Sand Lake 2.2 mi, Cass County
- Kerr Lake 2.3 mi, Cass County
- Little Portage Lake 2.3 mi, Cass County
- Lost Lake 2.4 mi, Cass County
- Widow Lake 2.5 mi, Cass County
Questions about Big Deep Lake
How deep is Big Deep Lake?
Big Deep Lake reaches a maximum depth of 107 ft according to Minnesota DNR records. About 9% of the lake is shallower than 15 feet.
How big is Big Deep Lake?
Big Deep Lake covers about 535.8 acres in Cass County, Minnesota.
How clear is Big Deep Lake?
Summer water clarity on Big Deep Lake averages 18.8 feet (Secchi depth) in MPCA monitoring through 2025. Its trophic state is oligotrophic.
Does Big Deep Lake have zebra mussels or other invasive species?
Big Deep 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.
How is the walleye population on Big Deep Lake?
In Minnesota DNR net surveys from 1990 to 1995, walleye numbers on Big Deep 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 Big Deep Lake?
Homes on Big Deep 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 Big Deep Lake and nearby lakes, including off-market opportunities when available.
What is it like to live on Big Deep Lake?
A mid-size lake with room for boating and fishing, about 9% shallow shoreline under 15 feet, and summer clarity around 18.8 feet. Conditions vary by property, so walk the frontage and ask us what similar homes have sold for.
Are there special fishing regulations on Big Deep Lake?
No lake-specific regulation was found for Big Deep Lake in Minnesota Rules or the DNR sunfish list. Statewide and zone regulations apply.
Ask us about Big Deep Lake
Whether you’re buying, selling, or just curious, our team works Cass County lakes every day. Send us a note or call (218) 656-6469.
Sources: Minnesota DNR LakeFinder records, DNR fish surveys (latest 1995), 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.