Great Bass Lake
Great Bass Lake in Oneida County, Wisconsin has a water quality grade of B (Good). 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 →
- Clarity
- 10.5 ft
- Typical in August
- 75°F
- Max depth
- 24 ft
- Area
- 116 acres
- Type
- Mesotrophic
- Trend
- ↑ Improving
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Great Bass Lake is a 116-acre mesotrophic lake in Oneida County, Wisconsin with a maximum depth of 24 feet. Water quality is graded B based on 1 sampling years through 2026. 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. Grade methodology: LakeQuality 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)
Good clarity, visible to about 10.5 ft. Phosphorus level: 14.2 µg/L. Trophic State Index: 43.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 10.5 ft | Not graded |
| Phosphorus | 14.2 µg/L | Good |
| Chlorophyll-a (Algae) | No recent samples | |
| Trophic State Index (TSI) | 43 | Mesotrophic |
Moderate nutrients, good water quality
Where to stay 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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Planning a whole trip? See where to stay at Wisconsin’s top lakes →
Water Temperature
Great Bass Lake typically sits around 75°F at the surface in August. 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.
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 a water-quality grade. LakeQuality grades Great Bass Lake B from EPA Water Quality Portal chemistry, 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
| Characteristic | Value |
|---|---|
| Maximum Depth | 24 ft |
| Surface Area | 116 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 Great Bass Lake
Water Quality Trend: ↑ Improving
Based on 4 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Water Clarity | ↑ Improving | +0.3 m/yr | 4 |
| Phosphorus | ↑ Improving | -1.66 µg/L/yr | 4 |
County Ranking
Ranked #48 of 67 lakes in Oneida County
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. LakeQuality grades it B for nutrients and algae. The letter is not a swimming clearance.
What is the water quality grade for Great Bass Lake?
- Great Bass Lake in Oneida County, Wisconsin has a water quality grade of B (Good). 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?
- Good for swimming, clear water with low algae levels. Great Bass Lake has a water quality grade of B (Good). Always check local health department advisories before swimming.
What is the water temperature of Great Bass Lake?
- Great Bass Lake typically sits around 75°F at the surface in August, 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 a water-quality grade. LakeQuality grades Great Bass Lake B from EPA Water Quality Portal chemistry, 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.
Explore Great Bass Lake across LakeQuality
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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)
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