Lake Eau Galle
Lake Eau Galle in Dunn County, Wisconsin has a water quality grade of D (Nutrient-rich). Water clarity: 3 ft visibility. Phosphorus: 68.6 µg/L. Surface area: 350 acres.
- Clarity
- 3 ft
- Max depth
- ~35 ft est.
- Area
- 350 acres
- Type
- Eutrophic
- Trend
- ↓ Declining
- Public access
- Yes
Grade D measures nutrients and algae, not whether this is a good place for a cabin trip. Cabins and rentals near Lake Eau Galle →
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Lake Eau Galle is a 350-acre productive, nutrient-rich eutrophic lake in Dunn County, Wisconsin with an estimated average depth of about 35 feet. Water quality is graded D based on 1 sampling years through 2025. Overall water quality is declining over recent sampling years. Limited fish-species data available. Public access is available with 2 public boat landings. Compared to the 2 other monitored lakes in Dunn County, Lake Eau Galle ranks #3 for water quality.
Source: EPA Water Quality Portal sampling records, Wisconsin DNR Surface Water, last sampled 2025-09-13. Grade methodology: LakeQuality methodology.
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Swimming Safety
Grade onlyLimited data
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.
Nutrients and algae run higher than average — check local advisories before swimming, and skip the water if you see scum
Water Quality Grade: D (Nutrient-rich)
Very murky, less than 3 ft of visibility. Phosphorus level: 68.6 µg/L. Trophic State Index: 63.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 3 ft | Not graded |
| Phosphorus | 68.6 µg/L | Poor |
| Chlorophyll-a (Algae) | No recent samples | |
| Trophic State Index (TSI) | 63 | Eutrophic |
High nutrients, frequent algae, reduced clarity
Where to stay near Lake Eau Galle
Compare lakeside cabins, hotels, and vacation rentals near Lake Eau Galle in Dunn 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. The water-quality grade measures nutrients and algae, not lodging — cabins and rentals around Lake Eau Galle are listed below.
Top-rated places to stay near Lake Eau Galle
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DNR Reports & Resources
Wisconsin DNR Fisheries scientists publish multi-year survey reports for Lake Eau Galle covering fish populations, stocking, water quality, and management. 1 report on file.
These links open on the official state DNR websites (Wisconsin DNR survey PDFs · Minnesota DNR LakeFinder).
- 2023Lake Eau Galle spring survey, 2023Fisheries Survey · WI DNR · 2023 (PDF)
Lake Details
| Characteristic | Value |
|---|---|
| Maximum Depth | ~35 ft est. |
| Average Depth | ~18 ft est. |
| Surface Area | 350 acres |
| Public Access | Yes |
Depth marked “est.” is a modeled maximum from GLOBathy (Khazaei et al. 2022, CC0), not a measured survey. Wisconsin has not published bathymetry for Lake Eau Galle.
Lake Size & Watershed
Size, shoreline, and watershed area from HydroLAKES (HydroSHEDS). Mean depth here is modelled, not surveyed — HydroLAKES v1.0 estimates lake depth from surrounding terrain rather than from soundings. Treat it as an approximation, and prefer a state bathymetric survey where one exists.
Recreation & Access
- Pineview ParkPublic
- 43rd AvenuePublic
Named access points in the USGS National Boat Ramps inventory, within about 3 miles. More lakes with boat ramps
Fishing Lake Eau Galle
Water Quality Trend: ↓ Declining
Based on 3 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Water Clarity | ↓ Declining | -0.114 m/yr | 3 |
| Phosphorus | ↓ Declining | +2 µg/L/yr | 2 |
Reservoir Info (USACE NID)
Lake Eau Galle is a man-made reservoir impounded by the Eau Galle (completed 1913), built primarily for hydroelectric on the Eau Galle; buttress-type dam, 31 ft tall and 171 ft long.
- Surface area
- 350 ac
- Normal storage
- 2,070 ac-ft
- Max storage
- 2,070 ac-ft
- Drainage area
- 173 sq mi
- Hazard class
- Low
- Owner
- Eau Galle Renewable Energy Co.
All listed purposes: Hydroelectric;Recreation.
Source: USACE National Inventory of Dams, NID ID WI00008 · Operator website
Regulated Pollution Sources Nearby
1 EPA-permitted facility operate within about 5 miles of Lake Eau Galle under Clean Water Act (NPDES) discharge permits.
- Eau Galle Cheese Factory IncDurand · 1.1 mi away · NPDES WI0003182
Facilities permitted to discharge under the Clean Water Act within ~5 miles; proximity does not by itself mean a facility affects this lake. Source: EPA ECHO (ICIS-NPDES), as of 2026-07.
County Ranking
Ranked #3 of 3 lakes in Dunn County
Nearby Lakes in Dunn County
Frequently asked questions about Lake Eau Galle
Where is Lake Eau Galle?
- Lake Eau Galle is a lake in Dunn County, Wisconsin. LakeQuality grades it D for nutrients and algae. The letter is not a swimming clearance.
What is the water quality grade for Lake Eau Galle?
- Lake Eau Galle in Dunn County, Wisconsin has a water quality grade of D (Nutrient-rich). Water clarity: 3 ft visibility. Phosphorus: 68.6 µg/L. Surface area: 350 acres.
Is Lake Eau Galle safe to swim in?
- Nutrients and algae run higher than average — check local advisories before swimming, and skip the water if you see scum. Lake Eau Galle has a water quality grade of D (Nutrient-rich). Always check local health department advisories before swimming.
How deep is Lake Eau Galle?
- No published bathymetric survey covers Lake Eau Galle, so its depth has not been measured. The HydroLAKES global model estimates an average depth of about 35 feet, but that is a modelled estimate derived from surrounding terrain rather than a measurement on the water, so treat it as approximate. The lake covers 350 acres.
Are there boat ramps on Lake Eau Galle?
- Lake Eau Galle has 2 documented boat landings in the USGS National Boat Ramps inventory. Named access points include Pineview Park, 43rd Avenue. Public access is listed as yes.
Explore Lake Eau Galle across LakeQuality
Depth, room, public access, and the state wake-sport rules
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High nutrients, frequent algae, reduced clarity
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Where this data comes from
18 measurements from 2 monitoring stations, 2022–2025. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- Wisconsin Department of Natural Resources
WIDNR_WQX18 samples · 2022–2025
Analytical methods
- Phosphorus by Colorimetry
Monitoring station identifiers (2)
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
Regulated discharger data from EPA ECHO (ICIS-NPDES)
Lake size & watershed from HydroLAKES (HydroSHEDS)
Named boat-access points from the USGS National Boat Ramps inventory