Bass Lake
Oconto County, WisconsinMesotrophic
On the LakeGrade scale Bass Lake grades a B, with clarity at 6.0 ft and 16 µg/L of phosphorus placing it above the Wisconsin median. Clarity is the limiting factor — phosphorus is reasonable but suspended particles or algal cells keep water transparency below Wisconsin norms.
A TSI near 48 places Bass Lake in the mesotrophic band — moderate productivity, with seasonal swings between clearer spring water and richer late-summer conditions. Bass Lake is a shallow lake at 11 ft maximum depth, which means it warms quickly, mixes constantly, and amplifies nutrient inputs. Bass Lake is small — 13 acres alongside partial shoreline records — which makes it sensitive to even modest changes in watershed runoff or recreational pressure. Bass Lake sits at rank 46 of 62 in Oconto County, in the lower half of the local distribution.
Eurasian watermilfoil is established at Bass Lake, which can dampen recreational access and pressure the native plant community. Bass fishing is part of the appeal: the species list runs to 3, anchored by largemouth and/or smallmouth bass. Monitoring depth is thin here: the LakeGrade rubric is applied to a small number of sample years, and the grade will be revised as more data accumulates.
Source: EPA Water Quality Portal sampling records, Wisconsin DNR Surface Water, last sampled 2024-09-10. Grade methodology: LakeGrade methodology.
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Swimming Safety
Good for swimming, clear water with low algae levels
Water Quality Grade: B, Good
Murky, only visible to about 6 ft. Phosphorus level: 15.9 µg/L. Trophic State Index: 48.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 6 ft | D |
| Phosphorus | 15.9 µg/L | A |
| Chlorophyll-a (Algae) | No data | |
| Trophic State Index (TSI) | 48 | Mesotrophic |
Moderate nutrients, good water quality
Lake Details
| Characteristic | Value |
|---|---|
| Maximum Depth | 11 ft |
| Surface Area | 13 acres |
Fish Species
Click a species to see all Wisconsin and Minnesota lakes where it is found.
→ Best fishing times for Bass Lake (14-day solunar calendar)
→ Is it safe to eat fish from Bass Lake? (mercury & PFAS guide)
→ Bass Lake fishing regulations (limits, seasons, special rules)
Invasive & Introduced Species
Red chips are ecologically harmful invasive species. Gray chips are stocked or introduced fish that aren't a current ecological concern.
Water Quality Trend: → Stable
Based on 6 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Water Clarity | ↓ Declining | -2.269 m/yr | 3 |
| Phosphorus | ↑ Improving | -0.35 µg/L/yr | 6 |
Location
County Ranking
Ranked #46 of 62 lakes in Oconto County
Cleaner Lakes Within 30 Miles
Bass Lake holds Grade B. 5 nearby lakes hold higher grades.
- ANeligan LakeOconto County · mi · Higher grade (B → A)
- ABear Paw LakeOconto County · mi · Higher grade (B → A)
- AThunder LakeMarinette County · mi · Higher grade (B → A)
- ACrooked LakeOconto County · mi · Higher grade (B → A)
- ABoundary LakeOconto County · mi · Higher grade (B → A)
Nearby Lakes in Oconto County
More Wisconsin Lake Rankings
State Parks Near Bass Lake
Other Grade B Lakes in Wisconsin
Mesotrophic Lakes in Wisconsin
WI DNR Lake Profile
Authoritative data from the Wisconsin DNR LakePages. 6 stations on file (most recent sample 2025).
Fish Species (DNR-rated)
Data Sources
Water quality data from the EPA Water Quality Portal
Grading methodology based on Metropolitan Council standards
Most recent sample: 2024-09-10
Monitoring stations: 1