Trillium Lake
Cass County, Minnesota, near Hackensack. DNR lake ID 11027000.
Trillium Lake is a 155.5-acre lake in Cass County, Minnesota, near Hackensack. Its deepest point reaches 48 ft, and about 59% of the lake is shallower than 15 feet. Summer water clarity averages 10.7 feet in Minnesota Pollution Control Agency monitoring, which places it in the mesotrophic nutrient class. It is not on the DNR infested waters list as of September 2026.
Buying or selling on Trillium 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 | 11027000 |
|---|---|
| County | Cass County, near Hackensack |
| Surface area | 155.5 acres |
| Maximum depth | 48 ft |
| Share under 15 ft | 59% |
| Water clarity (summer) | 10.7 ft through 2020 |
| Phosphorus (summer) | 22.2 µg/L |
| Algae, chlorophyll-a (summer) | 5.9 µg/L |
| Nutrient class | Mesotrophic |
| 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 2020: clarity 10.7 ft, phosphorus 22.2 µg/L, algae (chlorophyll-a) 5.9 µg/L. Using the Carlson trophic state index, Trillium Lake rates as mesotrophic.
Fishing on Trillium Lake
The most recent DNR standard fish survey was in 2002 (24 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 |
|---|---|---|---|
| Northern pike | gill | 12.67 | 3.5 to 8.9 |
| Northern pike | trap | 0.22 | n/a |
| Yellow perch | gill | 5.0 | 1.0 to 10.3 |
| Black crappie | gill | 1.67 | 1.0 to 3.9 |
| Black crappie | trap | 0.44 | 0.8 to 4.0 |
| Bluegill | gill | 9.83 | n/a |
| Bluegill | trap | 92.56 | 9.5 to 57.3 |
| Largemouth bass | trap | 0.89 | 0.3 to 1.4 |
| Pumpkinseed | gill | 0.33 | n/a |
| Pumpkinseed | trap | 2.0 | 1.5 to 6.8 |
Largest fish measured in recent DNR samples: Largemouth bass 12.0 in (2002), Walleye 25.0 in (1997), Northern pike 33.0 in (2002).
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
- Lost Lake 0.9 mi, Cass County
- Kerr Lake 1.2 mi, Cass County
- Kid Lake 1.5 mi, Cass County
- Big Deep Lake 1.5 mi, Cass County
- Webb Lake 2.0 mi, Cass County
- Child Lake 2.4 mi, Cass County
- Baby Lake 2.5 mi, Cass County
- Squeedunk Lake 2.6 mi, Cass County
Questions about Trillium Lake
How deep is Trillium Lake?
Trillium Lake reaches a maximum depth of 48 ft according to Minnesota DNR records. About 59% of the lake is shallower than 15 feet.
How big is Trillium Lake?
Trillium Lake covers about 155.5 acres in Cass County, Minnesota.
How clear is Trillium Lake?
Summer water clarity on Trillium Lake averages 10.7 feet (Secchi depth) in MPCA monitoring through 2020. Its trophic state is mesotrophic.
Does Trillium Lake have zebra mussels or other invasive species?
Trillium 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 Trillium Lake?
In Minnesota DNR net surveys from 1990 to 1997, walleye numbers on Trillium 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 Trillium Lake?
Homes on Trillium 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 Trillium Lake and nearby lakes, including off-market opportunities when available.
What is it like to live on Trillium Lake?
Small, quiet water suited to paddling and fishing, about 59% shallow shoreline under 15 feet, and summer clarity around 10.7 feet. Conditions vary by property, so walk the frontage and ask us what similar homes have sold for.
Are there special fishing regulations on Trillium Lake?
No lake-specific regulation was found for Trillium Lake in Minnesota Rules or the DNR sunfish list. Statewide and zone regulations apply.
Ask us about Trillium 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 2002), 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.