Little Pine Lake
Little Pine Lake in Iron County, Wisconsin has a water quality grade of B (Good). Water clarity: 7.4 ft visibility. Phosphorus: 13.3 µg/L. Maximum depth: 32 ft. Surface area: 18 acres.
- Clarity
- 7.4 ft
- Max depth
- 32 ft
- Area
- 18 acres
- Type
- Mesotrophic
- Trend
- ↓ Declining
Next lake in Iron County
Little Pine Lake is a 18-acre mesotrophic lake in Iron County, Wisconsin with a maximum depth of 32 feet. Water quality is graded B based on 1 sampling years through 2022. Overall water quality is declining over recent sampling years. Compared to the 15 other monitored lakes in Iron County, Little Pine Lake ranks #6 for water quality.
Source: EPA Water Quality Portal sampling records, Wisconsin DNR Surface Water, last sampled 2022-08-29. Grade methodology: LakeGrade methodology.
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Swimming Safety
Grade onlyLow algae
Based on clarity and algae grades from past sampling — we do not hold live water temperature and a current cyanobacteria reading for this lake. Check your state or county health department before you swim.
Good for swimming, clear water with low algae levels
Water Quality Grade: B (Good)
Moderate clarity, visible to about 7.4 ft. Phosphorus level: 13.3 µg/L. Trophic State Index: 45.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 7.4 ft | Not graded |
| Phosphorus | 13.3 µg/L | Good |
| Chlorophyll-a (Algae) | No recent samples | |
| Trophic State Index (TSI) | 45 | Mesotrophic |
Moderate nutrients, good water quality
Where to stay near Little Pine Lake
Compare lakeside cabins, hotels, and vacation rentals near Little Pine Lake in Iron County, Wisconsin — live availability and prices for your trip. Switch the map to Satellite to see the lake and how close each stay is to the water.
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Lake Details
| Characteristic | Value |
|---|---|
| Maximum Depth | 32 ft |
| Surface Area | 18 acres |
Lake Size & Watershed
Size, shoreline, and watershed area from HydroLAKES (HydroSHEDS).
Fishing Little Pine Lake
WI DNR Lake Profile
Authoritative data from the Wisconsin DNR LakePages. 1 station on file (most recent sample 2022).
Water Quality Trend: ↓ Declining
Based on 6 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Water Clarity | ↓ Declining | -0.143 m/yr | 6 |
| Phosphorus | → Stable | +0.06 µg/L/yr | 6 |
EPA Impairment Status
Little Pine Lake is officially listed as impaired under Clean Water Act §303(d) in the 2024 EPA reporting cycle (IR category 5).
Causes of impairment
Source: EPA ATTAINS assessment unit WI10008933 · Official waterbody report · Matched by proximity (0.94 km)
County Ranking
Ranked #6 of 16 lakes in Iron County
Nearby Lakes in Iron County
Frequently asked questions about Little Pine Lake
What is the water quality grade for Little Pine Lake?
- Little Pine Lake in Iron County, Wisconsin has a water quality grade of B (Good). Water clarity: 7.4 ft visibility. Phosphorus: 13.3 µg/L. Maximum depth: 32 ft. Surface area: 18 acres.
Is Little Pine Lake safe to swim in?
- Good for swimming, clear water with low algae levels. Little Pine Lake has a water quality grade of B (Good). Always check local health department advisories before swimming.
How deep is Little Pine Lake?
- Little Pine Lake has a maximum depth of 32 feet. The lake covers 18 acres.
Explore Little Pine Lake across LakeGrade
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Moderate nutrients, good water quality
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Other Grade B Lakes in Wisconsin
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Where this data comes from
27 measurements from 1 monitoring station, 2020–2022. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- Wisconsin Department of Natural Resources
WIDNR_WQX27 samples · 2020–2022
Analytical methods
- Phosphorus by Colorimetry
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
Impairment status from EPA ATTAINS 303(d) database
Lake size & watershed from HydroLAKES (HydroSHEDS)
Fish and recreation data from Wisconsin DNR Lakes