Pine Lake
Pine Lake in Iron County, Wisconsin has a water quality grade of B (Good). Water clarity: 6 ft visibility. Phosphorus: 17.8 µg/L. Maximum depth: 41 ft. Surface area: 300 acres.
- Clarity
- 6 ft
- Typical in August
- 73°F
- Max depth
- 41 ft
- Area
- 300 acres
- Type
- Mesotrophic
- Trend
- ↓ Declining
- Public access
- Yes
Next lake in Iron County
Pine Lake is a 300-acre mesotrophic lake in Iron County, Wisconsin with a maximum depth of 41 feet. Water quality is graded B based on 1 sampling years through 2026. Overall water quality is declining over recent sampling years. The lake supports 5 documented fish species including Musky, Panfish, and Largemouth Bass. Public access is available with 1 public boat landing. Compared to the 15 other monitored lakes in Iron County, Pine Lake ranks #11 for water quality.
Source: EPA Water Quality Portal sampling records, Wisconsin DNR Surface Water, last sampled 2026-04-30. 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)
Murky, only visible to about 6 ft. Phosphorus level: 17.8 µg/L. Trophic State Index: 48.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 6 ft | Not graded |
| Phosphorus | 17.8 µg/L | Good |
| Chlorophyll-a (Algae) | No recent samples | |
| Trophic State Index (TSI) | 48 | Mesotrophic |
Moderate nutrients, good water quality
Where to stay near Pine Lake
Compare lakeside cabins, hotels, and vacation rentals near 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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Water Temperature
Pine Lake typically sits around 73°F at the surface in August. Summer average is about 74°F. Usually warmest in Jul (about 76°F) and coldest in Apr (about 51°F). These are typical values by month — not a live reading.
Typical surface water temperature by month, from 16 field readings (2024–2025) via the EPA Water Quality Portal. See the full Pine Lake water temperature breakdown →
Lake Details
| Characteristic | Value |
|---|---|
| Maximum Depth | 41 ft |
| Surface Area | 300 acres |
| Public Access | Yes |
Recreation & Access
- Pine LakePublic
Fish Species
Click a species to see every graded lake where it is documented.
Fishing Pine Lake
Invasive & Introduced Species
Red chips are ecologically harmful invasive species. Gray chips are stocked or introduced fish that aren't a current ecological concern.
WI DNR Lake Profile
Authoritative data from the Wisconsin DNR LakePages. Monitored by volunteers since 1993. 1 station on file (most recent sample 2025).
Fish Species (DNR-rated)
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
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
County Ranking
Ranked #11 of 16 lakes in Iron County
Nearby Lakes in Iron County
Frequently asked questions about Pine Lake
What is the water quality grade for Pine Lake?
- Pine Lake in Iron County, Wisconsin has a water quality grade of B (Good). Water clarity: 6 ft visibility. Phosphorus: 17.8 µg/L. Maximum depth: 41 ft. Surface area: 300 acres.
Is Pine Lake safe to swim in?
- Good for swimming, clear water with low algae levels. Pine Lake has a water quality grade of B (Good). Always check local health department advisories before swimming.
What is the water temperature of Pine Lake?
- Pine Lake typically sits around 73°F at the surface in August, from 16 EPA Water Quality Portal field readings (2024–2025). That is a typical value for the month, not a live reading.
How deep is Pine Lake?
- Pine Lake has a maximum depth of 41 feet. The lake covers 300 acres.
What fish are in Pine Lake?
- Fish species found in Pine Lake include Musky, Panfish, Largemouth Bass, Smallmouth Bass, Walleye. Pine Lake is located in Iron County, Wisconsin.
Are there boat ramps on Pine Lake?
- Pine Lake has 1 documented boat landing in the USGS National Boat Ramps inventory. Named access points include Pine Lake. Public access is listed as yes.
Explore Pine Lake across LakeGrade
Depth, room, public access, and the state wake-sport rules
Fish species and top-graded lakes across Wisconsin
Fish species and best lakes in Iron County
Species activity outlook by water temperature and season
Top lakes and where to stay in the Northwoods Wisconsin area
Where to stay at Wisconsin's top lakes, each with its grade
Lakes in the Lake Superior Basin (MN+WI), ranked by water quality
Moderate nutrients, good water quality
Wisconsin's cleanest and most-polluted lakes, ranked
More Wisconsin Lake Rankings
Other Grade B Lakes in Wisconsin
Mesotrophic Lakes in Wisconsin
Where this data comes from
48 measurements from 1 monitoring station, 2020–2026. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- Wisconsin Department of Natural Resources
WIDNR_WQX48 samples · 2020–2026
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
Named boat-access points from the USGS National Boat Ramps inventory