Big Eau Pleine Southeast Point Lake
Big Eau Pleine Southeast Point Lake in Marathon County, Wisconsin is not rated for water quality — its monitoring record does not meet the evidence bar. Water clarity: 1.5 ft visibility. Maximum depth: 46 ft. Surface area: 6348 acres.
- Clarity
- 1.5 ft
- Max depth
- 46 ft
- Area
- 6,348 acres
- Trend
- ↑ Improving
- Public access
- Yes
Next lake in Marathon County
Why Big Eau Pleine Southeast Point Lake has no grade
We grade a lake only when its monitoring record clears the evidence bar: at least three phosphorus or chlorophyll-a samples in the last ten years, scored against EPA National Lakes Assessment thresholds for this lake’s ecoregion. For Big Eau Pleine Southeast Point Lake, the only measurement available is water clarity, which is not a water-quality indicator on its own — EPA's National Lakes Assessment does not grade clarity. Sampling here has recorded water clarity, but not phosphorus and algae (chlorophyll-a).
Not Rated is not an F. It is EPA Integrated Reporting Category 3 — insufficient information. The water here may be excellent or poor; nobody has measured enough of it to say. Everything below that has been measured is still reported on this page.
Sampling is run by WI DNR and volunteer programs, and published through the EPA Water Quality Portal. Read the full grading methodology.
Big Eau Pleine Southeast Point Lake is a 6,348-acre lake in Marathon County, Wisconsin with a maximum depth of 46 feet. Overall water quality is improving over recent sampling years. The lake supports 4 documented fish species including Musky, Smallmouth Bass, and Northern Pike. Public access is available with 3 public boat landings.
Source: EPA Water Quality Portal sampling records, Wisconsin DNR Surface Water, last sampled 2023-06-26. Grade methodology: LakeGrade methodology.
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Swimming Safety
Not ratedLimited data
Not rated for swimming — there is not enough monitoring data to judge this lake
Water quality measurements for Big Eau Pleine Southeast Point Lake
These readings exist but do not meet the evidence bar for an A–F grade — see why.
Very murky, less than 1.5 ft of visibility. Trophic State Index: 71.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 1.5 ft | Not graded |
| Phosphorus | No recent samples | |
| Chlorophyll-a (Algae) | No recent samples | |
| Trophic State Index (TSI) | 71 | Hypereutrophic |
Very high nutrients, dense algae, poor clarity
Where to stay near Big Eau Pleine Southeast Point Lake
Compare lakeside cabins, hotels, and vacation rentals near Big Eau Pleine Southeast Point Lake in Marathon 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 Big Eau Pleine Southeast Point Lake
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Lake Details
| Characteristic | Value |
|---|---|
| Maximum Depth | 46 ft |
| Surface Area | 6,348 acres |
| Public Access | Yes |
Lake Size & Watershed
Size, shoreline, and watershed area from HydroLAKES (HydroSHEDS).
Recreation & Access
- Sandy Shore DrivePublic
- Highway OPublic
- Highway O - SouthSemi-private
Fish Species
Click a species to see every graded lake where it is documented.
Fishing Big Eau Pleine Southeast Point Lake
WI DNR Lake Profile
Authoritative data from the Wisconsin DNR LakePages. Monitored by volunteers since 2006. 15 stations on file (most recent sample 2026).
Fish Species (DNR-rated)
Water Quality Trend: ↑ Improving
Based on 7 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Water Clarity | ↑ Improving | +0.046 m/yr | 7 |
| Phosphorus | ↑ Improving | -4.75 µg/L/yr | 3 |
Graded lakes near Big Eau Pleine Southeast Point Lake
Big Eau Pleine Southeast Point Lake has no grade, but these lakes within a short drive do.
Nearby Lakes in Marathon County
Frequently asked questions about Big Eau Pleine Southeast Point Lake
What is the water quality grade for Big Eau Pleine Southeast Point Lake?
- Big Eau Pleine Southeast Point Lake in Marathon County, Wisconsin is not rated for water quality — its monitoring record does not meet the evidence bar. Water clarity: 1.5 ft visibility. Maximum depth: 46 ft. Surface area: 6348 acres.
Is Big Eau Pleine Southeast Point Lake safe to swim in?
- Not rated for swimming — there is not enough monitoring data to judge this lake. Big Eau Pleine Southeast Point Lake is not rated for water quality — its monitoring record does not meet the evidence bar. Always check local health department advisories before swimming.
How deep is Big Eau Pleine Southeast Point Lake?
- Big Eau Pleine Southeast Point Lake has a maximum depth of 46 feet. The lake covers 6348 acres.
What fish are in Big Eau Pleine Southeast Point Lake?
- Fish species found in Big Eau Pleine Southeast Point Lake include Musky, Smallmouth Bass, Northern Pike, Walleye. Big Eau Pleine Southeast Point Lake is located in Marathon County, Wisconsin.
Are there boat ramps on Big Eau Pleine Southeast Point Lake?
- Big Eau Pleine Southeast Point Lake has 3 documented boat landings in the USGS National Boat Ramps inventory. Named access points include Sandy Shore Drive, Highway O, Highway O - South. Public access is listed as yes.
Explore Big Eau Pleine Southeast Point Lake across LakeGrade
Depth, room, public access, and the state wake-sport rules
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Where this data comes from
11 measurements from 1 monitoring station, 2022–2023. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- Wisconsin Department of Natural Resources
WIDNR_WQX11 samples · 2022–2023
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