Lac la Croix Lake
Lac la Croix Lake in St. Louis County, Minnesota is not rated for water quality — its monitoring record does not meet the evidence bar. Water clarity: 2.5 ft visibility. Maximum depth: 30 ft. Surface area: 1044.61 acres.
- Clarity
- 2.5 ft
- Max depth
- 30 ft
- Area
- 1,045 acres
- Public access
- No
Next lake in St. Louis County
Why Lac la Croix Lake has no grade
We grade a lake only when its monitoring record clears the evidence bar: at least three phosphorus or chlorophyll-a samples in the last ten years, scored against EPA National Lakes Assessment thresholds for this lake’s ecoregion. For Lac la Croix Lake, no nutrient or algae measurement meets the evidence bar (at least 3 samples within 10 years). Sampling here has recorded water clarity, but not phosphorus and algae (chlorophyll-a).
Not Rated is not an F. It is EPA Integrated Reporting Category 3 — insufficient information. The water here may be excellent or poor; nobody has measured enough of it to say. Everything below that has been measured is still reported on this page.
Sampling is run by MPCA and volunteer programs, and published through the EPA Water Quality Portal. Read the full grading methodology.
Lac la Croix Lake is a 1,045-acre lake in St. Louis County, Minnesota with a maximum depth of 30 feet. The lake supports 10 documented fish species including black crappie, cisco species, and northern pike. No public access — the lake is private or restricted.
Source: EPA Water Quality Portal sampling records, Minnesota DNR LakeFinder, last sampled 2025-09-04. Grade methodology: LakeGrade methodology.
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Swimming Safety
Not ratedLimited data
Not rated for swimming — there is not enough monitoring data to judge this lake
Water quality measurements for Lac la Croix Lake
These readings exist but do not meet the evidence bar for an A–F grade — see why.
Very murky, less than 2.5 ft of visibility. Trophic State Index: 64.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 2.5 ft | Not graded |
| Phosphorus | No recent samples | |
| Chlorophyll-a (Algae) | No recent samples | |
| Trophic State Index (TSI) | 64 | Eutrophic |
High nutrients, frequent algae, reduced clarity
Where to stay near Lac la Croix Lake
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Lake Details
| Characteristic | Value |
|---|---|
| Maximum Depth | 30 ft |
| Surface Area | 1,045 acres |
| Shoreline Length | 13 mi |
| Littoral Zone | 43% |
| Public Access | No |
Fish Species
Click a species to see every graded lake where it is documented.
Fishing Lac la Croix Lake
Nearby Lakes in St. Louis County
Frequently asked questions about Lac la Croix Lake
What is the water quality grade for Lac la Croix Lake?
- Lac la Croix Lake in St. Louis County, Minnesota is not rated for water quality — its monitoring record does not meet the evidence bar. Water clarity: 2.5 ft visibility. Maximum depth: 30 ft. Surface area: 1044.61 acres.
Is Lac la Croix Lake safe to swim in?
- Not rated for swimming — there is not enough monitoring data to judge this lake. Lac la Croix Lake is not rated for water quality — its monitoring record does not meet the evidence bar. Always check local health department advisories before swimming.
How deep is Lac la Croix Lake?
- Lac la Croix Lake has a maximum depth of 30 feet. The lake covers 1044.61 acres.
What fish are in Lac la Croix Lake?
- Fish species found in Lac la Croix Lake include black crappie, cisco species, northern pike, rock bass, sauger, shorthead redhorse, smallmouth bass, walleye, white sucker, yellow perch. Lac la Croix Lake is located in St. Louis County, Minnesota.
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Where this data comes from
1 measurement from 1 monitoring station, 2025. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- Minnesota Pollution Control Agency - Ambient Surface Water
MNPCA1 sample · 2025
Analytical methods
- Field measurement/observation, generic method
Monitoring station identifiers (1)
Grade thresholds from the EPA National Lakes Assessment (EPA 841-R-24-006, Table 6-3), applied by ecoregion. See how grades are calculated and data sources.
Other records on this page
Lake size & watershed from HydroLAKES (HydroSHEDS)
Lake details from Minnesota DNR LakeFinder