Green Lake
Green Lake in Sawyer County, Wisconsin has a water quality grade of C (Fair). Water clarity: 4.7 ft visibility. Phosphorus: 34 µg/L. Chlorophyll-a (algae): 5.8 µg/L. Maximum depth: 9 ft. Surface area: 50 acres.
- Clarity
- 4.7 ft
- Max depth
- 9 ft
- Area
- 50 acres
- Type
- Eutrophic
- Trend
- ↓ Declining
- Public access
- Yes
Next lake in Sawyer County
Green Lake is a 50-acre productive, nutrient-rich eutrophic lake in Sawyer County, Wisconsin with a maximum depth of 9 feet. Water quality is graded C based on 2 sampling years through 2021. Overall water quality is declining over recent sampling years. The lake supports 2 documented fish species including Panfish and Largemouth Bass. Public access is available with 1 public boat landing. Compared to the 44 other monitored lakes in Sawyer County, Green Lake ranks #32 for water quality.
Source: EPA Water Quality Portal sampling records, Wisconsin DNR Surface Water, last sampled 2021-08-23. Grade methodology: LakeGrade methodology.
Watch Green Lake water quality
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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)
Murky, only visible to about 4.7 ft. Phosphorus level: 34 µg/L. Chlorophyll-a: 5.8 µg/L. Trophic State Index: 53.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 4.7 ft | Not graded |
| Phosphorus | 34 µg/L | Fair |
| Chlorophyll-a (Algae) | 5.8 µg/L | Good |
| Trophic State Index (TSI) | 53 | Eutrophic |
High nutrients, frequent algae, reduced clarity
Where to stay near Green Lake
Compare lakeside cabins, hotels, and vacation rentals near Green 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 | 9 ft |
| Surface Area | 50 acres |
| Public Access | Yes |
Lake Size & Watershed
Size, shoreline, and watershed area from HydroLAKES (HydroSHEDS).
Recreation & Access
- Green LakeSemi-private
Fish Species
Click a species to see every graded lake where it is documented.
Fishing Green Lake
WI DNR Lake Profile
Authoritative data from the Wisconsin DNR LakePages. 1 station on file (most recent sample 1979).
Fish Species (DNR-rated)
DNR Reports & Resources
Wisconsin DNR Fisheries scientists publish multi-year survey reports for Green Lake covering fish populations, stocking, water quality, and management. 1 report on file.
These links open on the official state DNR websites (Wisconsin DNR survey PDFs · Minnesota DNR LakeFinder).
- 2023Mason and Evergreen lakes spring netting and shocking survey, 2023Netting Survey · WI DNR · 2023 (PDF)
Water Quality Trend: ↓ Declining
Based on 2 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Water Clarity | ↑ Improving | +1.5 m/yr | 2 |
| Phosphorus | ↓ Declining | +8 µg/L/yr | 2 |
| Chlorophyll-a | ↓ Declining | +1.3 µg/L/yr | 2 |
County Ranking
Ranked #32 of 45 lakes in Sawyer County
Nearby Lakes With Higher Grades
Green 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 Green Lake
What is the water quality grade for Green Lake?
- Green Lake in Sawyer County, Wisconsin has a water quality grade of C (Fair). Water clarity: 4.7 ft visibility. Phosphorus: 34 µg/L. Chlorophyll-a (algae): 5.8 µg/L. Maximum depth: 9 ft. Surface area: 50 acres.
Is Green Lake safe to swim in?
- Generally safe for swimming, moderate water quality. Green Lake has a water quality grade of C (Fair). Algae concentration (chlorophyll-a) is 5.8 µg/L. Always check local health department advisories before swimming.
How deep is Green Lake?
- Green Lake has a maximum depth of 9 feet. The lake covers 50 acres.
What fish are in Green Lake?
- Fish species found in Green Lake include Panfish, Largemouth Bass. Green Lake is located in Sawyer County, Wisconsin.
Are there boat ramps on Green Lake?
- Green Lake has 1 documented boat landing in the USGS National Boat Ramps inventory. Named access points include Green Lake. Public access is listed as yes.
Explore Green Lake across LakeGrade
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Where this data comes from
27 measurements from 1 monitoring station, 2020–2021. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- Lac Courte Oreilles (Tribal)
LCOWIS_WQX27 samples · 2020–2021
Analytical methods
- 4500 P E ~ Phosphorus in Water by Colorimetry- Ascorbic Acid Method
- 2320 B ~ Alkalinity by Gran Titration
- 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
Named boat-access points from the USGS National Boat Ramps inventory