Fisher Lake
Fisher Lake in Iron County, Wisconsin has a water quality grade of B (Good). Water clarity: 7 ft visibility. Phosphorus: 16.7 µg/L.
- Clarity
- 7 ft
- Typical in August
- 74°F
- Type
- Mesotrophic
- Trend
- ↑ Improving
- Public access
- Yes
Next lake in Iron County
Fisher Lake is a mesotrophic lake in Iron County, Wisconsin. Water quality is graded B based on 1 sampling years through 2025. Overall water quality is improving over recent sampling years. Limited fish-species data available. Public access is available with 1 public boat landing. Compared to the 15 other monitored lakes in Iron County, Fisher Lake ranks #13 for water quality.
Source: EPA Water Quality Portal sampling records, Wisconsin DNR Surface Water, last sampled 2025-09-25. 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 ft. Phosphorus level: 16.7 µg/L. Trophic State Index: 47.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 7 ft | Not graded |
| Phosphorus | 16.7 µg/L | Good |
| Chlorophyll-a (Algae) | No recent samples | |
| Trophic State Index (TSI) | 47 | Mesotrophic |
Moderate nutrients, good water quality
Where to stay near Fisher Lake
Compare lakeside cabins, hotels, and vacation rentals near Fisher 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
Fisher Lake typically sits around 74°F at the surface in August. Summer average is about 73°F. Usually warmest in Aug (about 74°F) and coldest in Sep (about 67°F). These are typical values by month — not a live reading.
Typical surface water temperature by month, from 24 field readings (2024–2025) via the EPA Water Quality Portal. See the full Fisher Lake water temperature breakdown →
Recreation & Access
- Fisher LakePublic
Fishing Fisher Lake
Water Quality Trend: ↑ Improving
Based on 6 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Water Clarity | ↑ Improving | +0.293 m/yr | 6 |
| Phosphorus | ↑ Improving | -1.3 µg/L/yr | 4 |
County Ranking
Ranked #13 of 16 lakes in Iron County
Nearby Lakes in Iron County
Frequently asked questions about Fisher Lake
What is the water quality grade for Fisher Lake?
- Fisher Lake in Iron County, Wisconsin has a water quality grade of B (Good). Water clarity: 7 ft visibility. Phosphorus: 16.7 µg/L.
Is Fisher Lake safe to swim in?
- Good for swimming, clear water with low algae levels. Fisher Lake has a water quality grade of B (Good). Always check local health department advisories before swimming.
What is the water temperature of Fisher Lake?
- Fisher Lake typically sits around 74°F at the surface in August, from 24 EPA Water Quality Portal field readings (2024–2025). That is a typical value for the month, not a live reading.
Are there boat ramps on Fisher Lake?
- Fisher Lake has 1 documented boat landing in the USGS National Boat Ramps inventory. Named access points include Fisher Lake. Public access is listed as yes.
Explore Fisher Lake across LakeGrade
Fish species and top-graded lakes across Wisconsin
Fish species and best lakes in Iron County
Species activity outlook by water temperature and season
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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
42 measurements from 2 monitoring stations, 2020–2025. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- Wisconsin Department of Natural Resources
WIDNR_WQX42 samples · 2020–2025
Analytical methods
- Phosphorus by Colorimetry
- Turbidity in Water
Monitoring station identifiers (2)
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)
Named boat-access points from the USGS National Boat Ramps inventory