Portage Lake
Cass County, Minnesota, near Tobique. DNR lake ID 11013400.
Portage Lake is a 156-acre lake in Cass County, Minnesota, near Tobique. Summer water clarity averages 7.2 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 Portage 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.
Tell us about your dream home on Portage LakeWhat’s my Portage Lake property worth?Call (218) 656-6469
Quick facts
| DNR lake ID | 11013400 |
|---|---|
| County | Cass County, near Tobique |
| Surface area | 156 acres |
| Maximum depth | Not surveyed |
| Share under 15 ft | Not surveyed |
| Water clarity (summer) | 7.2 ft through 2024 |
| Phosphorus (summer) | 19.5 µg/L |
| Algae, chlorophyll-a (summer) | 5.8 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 2024: clarity 7.2 ft, phosphorus 19.5 µg/L, algae (chlorophyll-a) 5.8 µg/L. Using the Carlson trophic state index, Portage Lake rates as mesotrophic.
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
- Lomish Lake 1.0 mi, Cass County
- Swift Lake 1.8 mi, Cass County
- Boy Lake 2.3 mi, Cass County
- Mabel Lake 2.8 mi, Cass County
- Little Swift Lake 3.3 mi, Cass County
- West Twin Lake 4.0 mi, Cass County
- Town Line Lake 4.4 mi, Cass County
- Phelon Lake 4.4 mi, Cass County
Questions about Portage Lake
How big is Portage Lake?
Portage Lake covers about 156 acres in Cass County, Minnesota.
How clear is Portage Lake?
Summer water clarity on Portage Lake averages 7.2 feet (Secchi depth) in MPCA monitoring through 2024. Its trophic state is mesotrophic.
Does Portage Lake have zebra mussels or other invasive species?
Portage 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.
Are there lake homes for sale on Portage Lake?
Homes on Portage 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 Portage Lake and nearby lakes, including off-market opportunities when available.
What is it like to live on Portage Lake?
Small, quiet water suited to paddling and fishing, and summer clarity around 7.2 feet. Conditions vary by property, so walk the frontage and ask us what similar homes have sold for.
Are there special fishing regulations on Portage Lake?
No lake-specific regulation was found for Portage Lake in Minnesota Rules or the DNR sunfish list. Statewide and zone regulations apply.
Ask us about Portage 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 not on record), 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.