Spring Lake vs St. Croix Lake
Water quality, depth, fish species, and recreation comparison.
St. Croix Lake has a higher water quality grade (C, Fair) than Spring Lake (F, Very Poor). Both are in Minnesota.
Spring Lake and St. Croix Lake are both in Minnesota — a same-state head-to-head where the comparison comes down to lake-specific differences in depth, watershed, and monitoring history rather than the broader state-level water-quality regime. The grades are meaningfully apart: St. Croix Lake grades a C while Spring Lake grades a F. That two-letter spread reflects real underlying differences — different watershed inputs, different depth profiles, or different monitoring rigor.
For a recreational visitor, the wider grade gap is decisive — St. Croix Lake is the better water-quality choice. For a researcher, the gap is the interesting part: what is different about the two watersheds, and which of those differences is mutable?
Spring Lake
Very murky, less than 2.1 ft of visibility.
St. Croix Lake
Moderate clarity, visible to about 8.7 ft.
Side-by-Side Metrics
| Metric | Spring Lake | St. Croix Lake |
|---|---|---|
| Overall Grade | F (Very Poor) | C (Fair) |
| Water Clarity | 2.1 ft | 8.7 ft |
| Phosphorus | No data | No data |
| Chlorophyll-a (Algae) | No data | No data |
| Maximum Depth | 17 ft | 78 ft |
| Surface Area | 1.5K acres | 8.4K acres |
| Public Access | Yes | No |
| Fish Species | 1 | 1 |
| Trophic State | eutrophic | mesotrophic |
Bold value = better for that metric (lower phosphorus / chlorophyll = cleaner; higher Secchi / depth / species count = better).
Verdict
St. Croix Lake wins on overall water quality with a Grade C versus Spring Lake's Grade F. Water clarity: 8.7 ft vs 2.1 ft. For fishing diversity, St. Croix Lake also leads with 1 species.