Gurno Lake
Gurno Lake in Sawyer County, Wisconsin has a water quality grade of C (Fair). Water clarity: 10 ft visibility. Phosphorus: 25 µg/L. Chlorophyll-a (algae): 4.1 µg/L. Maximum depth: 27 ft. Surface area: 76 acres.
- Clarity
- 10 ft
- Max depth
- 27 ft
- Area
- 76 acres
- Type
- Mesotrophic
- Trend
- ↑ Improving
Next lake in Sawyer County
Gurno Lake is a 76-acre mesotrophic lake in Sawyer County, Wisconsin with a maximum depth of 27 feet. Water quality is graded C based on 2 sampling years through 2024. Overall water quality is improving over recent sampling years. The lake supports 5 documented fish species including Musky, Panfish, and Largemouth Bass. Compared to the 44 other monitored lakes in Sawyer County, Gurno Lake ranks #41 for water quality.
Source: EPA Water Quality Portal sampling records, Wisconsin DNR Surface Water, last sampled 2024-08-31. Grade methodology: LakeGrade methodology.
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Swimming Safety
Grade onlyModerate
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.
Generally safe for swimming, moderate water quality
Water Quality Grade: C (Fair)
Good clarity, visible to about 10 ft. Phosphorus level: 25 µg/L. Chlorophyll-a: 4.1 µg/L. Trophic State Index: 46.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 10 ft | Not graded |
| Phosphorus | 25 µg/L | Fair |
| Chlorophyll-a (Algae) | 4.1 µg/L | Good |
| Trophic State Index (TSI) | 46 | Mesotrophic |
Moderate nutrients, good water quality
Where to stay near Gurno Lake
Compare lakeside cabins, hotels, and vacation rentals near Gurno Lake in Sawyer 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 | 27 ft |
| Surface Area | 76 acres |
Lake Size & Watershed
Size, shoreline, and watershed area from HydroLAKES (HydroSHEDS).
Fish Species
Click a species to see every graded lake where it is documented.
Fishing Gurno Lake
WI DNR Lake Profile
Authoritative data from the Wisconsin DNR LakePages. 1 station on file (most recent sample 2024).
Fish Species (DNR-rated)
Water Quality Trend: ↑ Improving
Based on 5 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Water Clarity | ↑ Improving | +0.44 m/yr | 5 |
| Phosphorus | ↑ Improving | -1.55 µg/L/yr | 4 |
| Chlorophyll-a | ↑ Improving | -0.2 µg/L/yr | 4 |
County Ranking
Ranked #41 of 45 lakes in Sawyer County
Nearby Lakes With Higher Grades
Gurno Lake holds Grade C. 3 nearby lakes hold higher nutrient-and-algae grades — useful for a swim day, not a reason to skip lodging here.
See full comparison →Nearby Lakes in Sawyer County
Frequently asked questions about Gurno Lake
What is the water quality grade for Gurno Lake?
- Gurno Lake in Sawyer County, Wisconsin has a water quality grade of C (Fair). Water clarity: 10 ft visibility. Phosphorus: 25 µg/L. Chlorophyll-a (algae): 4.1 µg/L. Maximum depth: 27 ft. Surface area: 76 acres.
Is Gurno Lake safe to swim in?
- Generally safe for swimming, moderate water quality. Gurno Lake has a water quality grade of C (Fair). Algae concentration (chlorophyll-a) is 4.1 µg/L. Always check local health department advisories before swimming.
How deep is Gurno Lake?
- Gurno Lake has a maximum depth of 27 feet. The lake covers 76 acres.
What fish are in Gurno Lake?
- Fish species found in Gurno Lake include Musky, Panfish, Largemouth Bass, Northern Pike, Walleye. Gurno Lake is located in Sawyer County, Wisconsin.
Explore Gurno Lake across LakeGrade
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Where this data comes from
61 measurements from 1 monitoring station, 2021–2024. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- Lac Courte Oreilles (Tribal)
LCOWIS_WQX61 samples · 2021–2024
Analytical methods
- 4500 P E ~ Phosphorus in Water by Colorimetry- Ascorbic Acid Method
- 4500 P F ~ Phosphorus in Water by Colorimetry Automated Ascorbic Acid Method
- 4500 P E ~ Phosphorus by Ascorbic Acid
- 10200 H ~ Chlorophyll a-b-c Determination
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)
Fish and recreation data from Wisconsin DNR Lakes