Great Bass Lake
Oneida County, Wisconsin116 acresView mapDirections
Wisconsin DNR publishes the water-quality measurements for Great Bass Lake. Here is what has been measured.
- Mesotrophic
- 24 ft max depth
Great Bass Lake in Oneida County, Wisconsin has water-quality measurements published by Wisconsin DNR, shown here as reported. Water clarity: 10.5 ft visibility. Phosphorus: 14.2 µg/L. Maximum depth: 24 ft. Surface area: 116 acres.
Wisconsin DNR lists Panfish as common on Great Bass Lake. DNR survey details →
Great Bass Lake is a 116-acre mesotrophic lake in Oneida County, Wisconsin with a maximum depth of 24 feet. Overall water quality is improving over recent sampling years. The lake supports 2 documented fish species including Panfish and Largemouth Bass. Compared to the 66 other monitored lakes in Oneida County, Great Bass Lake ranks #48 for water quality.
Source: EPA Water Quality Portal sampling records, Wisconsin DNR Surface Water, last sampled 2026-07-12. Methodology: how these readings are compared.
What Great Bass Lake is good for
From access and monitoring records, not editorial picks.
- Clear water10.5 ft of visibility
Swimming conditions
Readings onlyLow algae
Based on clarity and algae readings from past sampling — there is no live water temperature and a current cyanobacteria reading for this lake. Check your state or county health department before you swim.
Nutrient and algae readings are not a swimming clearance. Check local advisories before you swim.
Whether Great Bass Lake is safe to swim in today is a call for the Wisconsin Department of Natural Resources and the county health department, who post current advisories. LakeQuality does not issue swimming clearances.
Water quality measurements for Great Bass Lake
These are the measurements Wisconsin DNR publishes for Great Bass Lake, shown as reported. The condition class beside each reading is the EPA National Lakes Assessment class for this lake’s ecoregion.
Good clarity, visible to about 10.5 ft. Phosphorus 14.2 µg/L. TSI 43.
| Measure | Reading | Where it sits |
|---|---|---|
| Water clarity (Secchi depth) | 10.5ft | Measured, not scored How deep a black-and-white disk stays visible from the surface. Higher is clearer. |
| Total phosphorus | 14.2µg/L | Good GoodFairPoor |
| Chlorophyll-a (algae) | No reading The green pigment in algae — a direct measure of how much algae is in the water. | |
| Trophic state (TSI)Carlson's 0–100 index of how much algae a lake can support, from clarity, phosphorus and chlorophyll-a. | 43 | Mesotrophic OligotrophicMesotrophicEutrophicHypereutrophic |
Moderate nutrients, good water quality
Ask about Great Bass Lake
Answers come straight from the public measurements and survey records on this page.
Water Temperature
Great Bass Lake typically sits around 55°F at the surface in October. Summer average is about 73°F. Usually warmest in Jul (about 76°F) and coldest in Oct (about 55°F). These are typical values by month — not a live reading.
Column height runs from this lake’s coldest month (55°F) to its warmest (76°F).
Typical surface water temperature by month, from 74 field readings (2024–2026) via the EPA Water Quality Portal. See the full Great Bass Lake water temperature breakdown →
Wisconsin DNR lists Panfish as common on Great Bass Lake.
A DNR fisheries survey reports fish abundance and catch rates, not water quality. LakeQuality shows Great Bass Lake’s water-quality measurements separately, and the water-quality trend over 4 years of monitoring is improving. Catch rate is not a swim clearance and is not a weekly bite report.
WI DNR Lake Profile
Authoritative data from the Wisconsin DNR LakePages. Monitored by volunteers since 1995. 2 stations on file (most recent sample 2025).
Fish Species (DNR-rated)
Lake Details
Max depth
24 ft
Surface area
116 acres
Lake Size & Watershed
Watershed (drainage) area
0 sq mi
HydroLAKES / HydroSHEDS
Shoreline
1.9 mi
HydroLAKES / HydroSHEDS
Elevation
1,581 ft
Size, shoreline, and watershed area from HydroLAKES (HydroSHEDS).
Stays via Stay22
Stays near Great Bass Lake
Compare lakeside cabins, hotels, and vacation rentals near Great Bass Lake in Oneida 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.
Top-rated places to stay near Great Bass Lake
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Fish Species
Click a species to see every lake where it is documented.
Fishing Great Bass Lake
Water Quality Trend: Improving
Based on 4 years of monitoring (2023–2026).
Water clarity
Improving4 years
Phosphorus
Improving-1.66 µg/L/yr4 years
Nearby Lakes in Oneida County
Frequently asked questions about Great Bass Lake
Where is Great Bass Lake?
- Great Bass Lake is a lake in Oneida County, Wisconsin. Its water-quality measurements are published by Wisconsin DNR and shown on this page as reported.
What is the water quality of Great Bass Lake?
- Great Bass Lake in Oneida County, Wisconsin has water-quality measurements published by Wisconsin DNR, shown here as reported. Water clarity: 10.5 ft visibility. Phosphorus: 14.2 µg/L. Maximum depth: 24 ft. Surface area: 116 acres.
Is Great Bass Lake safe to swim in?
- Nutrient and algae readings are not a swimming clearance. Check local advisories before you swim.
What is the water temperature of Great Bass Lake?
- Great Bass Lake typically sits around 55°F at the surface in October, from 74 EPA Water Quality Portal field readings (2024–2026). That is a typical value for the month, not a live reading.
How deep is Great Bass Lake?
- Great Bass Lake has a maximum depth of 24 feet. The lake covers 116 acres.
What fish are in Great Bass Lake?
- Fish species found in Great Bass Lake include Panfish, Largemouth Bass. Great Bass Lake is located in Oneida County, Wisconsin.
What did the DNR fisheries survey find at Great Bass Lake?
- Wisconsin DNR lists Panfish as common on Great Bass Lake. A DNR fisheries survey reports fish abundance and catch rates, not water quality. LakeQuality shows Great Bass Lake’s water-quality measurements separately, and the water-quality trend over 4 years of monitoring is improving. Catch rate is not a swim clearance and is not a weekly bite report.
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Where this data comes from
63 measurements from 1 monitoring station, 2023–2026. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- Wisconsin Department of Natural Resources
WIDNR_WQX63 samples · 2023–2026
Analytical methods
- Phosphorus by Colorimetry
- Total Phosphorus After Block Digestion
- 2130 B ~ Nephelometric Method
Monitoring station identifiers (1)
EPA condition classes from the National Lakes Assessment (EPA 841-R-24-006, Table 6-3), applied by ecoregion. See where the data comes from and data sources.
Other records on this page
Lake size & watershed from HydroLAKES (HydroSHEDS)
Fish and recreation data from Wisconsin DNR Lakes