Big Newton Lake
Big Newton Lake in Marinette County, Wisconsin has a water quality grade of B (Good). Water clarity: 17 ft visibility. Phosphorus: 10.7 µg/L. Maximum depth: 40 ft. Surface area: 69 acres.
- Clarity
- 17 ft
- Max depth
- 40 ft
- Area
- 69 acres
- Type
- Oligotrophic
- Trend
- ↓ Declining
- Public access
- Yes
Next lake in Marinette County
Big Newton Lake is a 69-acre cold, clear oligotrophic lake in Marinette County, Wisconsin with a maximum depth of 40 feet. Water quality is graded B based on 1 sampling years through 2025. Overall water quality is declining over recent sampling years. The lake supports 5 documented fish species including Panfish, Largemouth Bass, and Smallmouth Bass. Public access is available. Compared to the 9 other monitored lakes in Marinette County, Big Newton Lake ranks #8 for water quality.
Source: EPA Water Quality Portal sampling records, Wisconsin DNR Surface Water, last sampled 2025-08-29. Grade methodology: LakeGrade 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)
Crystal clear, you can see 17 ft down. Phosphorus level: 10.7 µg/L. Trophic State Index: 37.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 17 ft | Not graded |
| Phosphorus | 10.7 µg/L | Good |
| Chlorophyll-a (Algae) | No recent samples | |
| Trophic State Index (TSI) | 37 | Oligotrophic |
Low nutrients, clear water, excellent for swimming
Where to stay near Big Newton Lake
Compare lakeside cabins, hotels, and vacation rentals near Big Newton Lake in Marinette 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 | 40 ft |
| Surface Area | 69 acres |
| Public Access | Yes |
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 Big Newton Lake
Invasive & Introduced Species
Red chips are ecologically harmful invasive species. Gray chips are stocked or introduced fish that aren't a current ecological concern.
WI DNR Lake Profile
Authoritative data from the Wisconsin DNR LakePages. Monitored by volunteers since 1989. 2 stations on file (most recent sample 2025).
Fish Species (DNR-rated)
Water Quality Trend: ↓ Declining
Based on 7 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Water Clarity | → Stable | +0.125 m/yr | 7 |
| Phosphorus | ↓ Declining | +1.73 µg/L/yr | 6 |
County Ranking
Ranked #8 of 10 lakes in Marinette County
Nearby Lakes in Marinette County
Frequently asked questions about Big Newton Lake
What is the water quality grade for Big Newton Lake?
- Big Newton Lake in Marinette County, Wisconsin has a water quality grade of B (Good). Water clarity: 17 ft visibility. Phosphorus: 10.7 µg/L. Maximum depth: 40 ft. Surface area: 69 acres.
Is Big Newton Lake safe to swim in?
- Good for swimming, clear water with low algae levels. Big Newton Lake has a water quality grade of B (Good). Always check local health department advisories before swimming.
How deep is Big Newton Lake?
- Big Newton Lake has a maximum depth of 40 feet. The lake covers 69 acres.
What fish are in Big Newton Lake?
- Fish species found in Big Newton Lake include Panfish, Largemouth Bass, Smallmouth Bass, Northern Pike, Walleye. Big Newton Lake is located in Marinette County, Wisconsin.
Explore Big Newton Lake across LakeGrade
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Species activity outlook by water temperature and season
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Low nutrients, clear water, excellent for swimming
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State Parks Near Big Newton Lake
Other Grade B Lakes in Wisconsin
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Where this data comes from
29 measurements from 1 monitoring station, 2020–2025. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- Wisconsin Department of Natural Resources
WIDNR_WQX29 samples · 2020–2025
Analytical methods
- Phosphorus by Colorimetry
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