Big Moon Lake at
Big Moon Lake at in Barron County, Wisconsin has a water quality grade of B (Good). Water clarity: 10 ft visibility. Phosphorus: 23.3 µg/L. Maximum depth: 48 ft. Surface area: 187 acres.
Wisconsin DNR lists Panfish as common on Big Moon Lake at. DNR survey details →
- Clarity
- 10 ft
- Max depth
- 48 ft
- Area
- 187 acres
- Type
- Mesotrophic
- Trend
- → Stable
- Public access
- Yes
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Big Moon Lake at is a 187-acre mesotrophic lake in Barron County, Wisconsin with a maximum depth of 48 feet. Water quality is graded B based on 1 sampling years through 2026. The lake supports 5 documented fish species including Musky, Panfish, and Largemouth Bass. Public access is available with 1 public boat landing. Compared to the 27 other monitored lakes in Barron County, Big Moon Lake at ranks #14 for water quality.
Source: EPA Water Quality Portal sampling records, Wisconsin DNR Surface Water, last sampled 2026-06-29. 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 ft. Phosphorus level: 23.3 µg/L. Trophic State Index: 47.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 10 ft | Not graded |
| Phosphorus | 23.3 µg/L | Good |
| Chlorophyll-a (Algae) | No recent samples | |
| Trophic State Index (TSI) | 47 | Mesotrophic |
Moderate nutrients, good water quality
Where to stay near Big Moon Lake at
Compare lakeside cabins, hotels, and vacation rentals near Big Moon Lake at in Barron 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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Wisconsin DNR lists Panfish as common on Big Moon Lake at.
A DNR fisheries survey reports fish abundance and catch rates, not a water-quality grade. LakeQuality grades Big Moon Lake at B from EPA Water Quality Portal chemistry, and the water-quality trend over 6 years of monitoring is stable. 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 1999. 1 station on file (most recent sample 2025).
Fish Species (DNR-rated)
Lake Details
| Characteristic | Value |
|---|---|
| Maximum Depth | 48 ft |
| Surface Area | 187 acres |
| Public Access | Yes |
Lake Size & Watershed
Size, shoreline, and watershed area from HydroLAKES (HydroSHEDS).
Recreation & Access
- Big Moon LakePublic
Named access points in the USGS National Boat Ramps inventory, within about 3 miles. More lakes with boat ramps
Fish Species
Click a species to see every graded lake where it is documented.
Fishing Big Moon Lake at
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 | → Stable | +0.036 m/yr | 4 |
| Phosphorus | → Stable | +0.19 µg/L/yr | 6 |
Reservoir Info (USACE NID)
Big Moon Lake at is a man-made reservoir impounded by the Big Moon Lake (completed 1968), built primarily for recreation on the Moon Creek; earth-type dam, 9 ft tall and 500 ft long.
- Surface area
- 187 ac
- Normal storage
- 900 ac-ft
- Max storage
- 2,000 ac-ft
- Drainage area
- 7 sq mi
- Hazard class
- Low
- Owner
- Barron County
Source: USACE National Inventory of Dams, NID ID WI00486 · Operator website · Matched by proximity (0.38 km)
EPA Impairment Status
Big Moon Lake at is officially listed as impaired under Clean Water Act §303(d) in the 2024 EPA reporting cycle (IR category 5R).
Causes of impairment
Source: EPA ATTAINS assessment unit WI10004359 · Official waterbody report · Matched by proximity (0.46 km)
Regulated Pollution Sources Nearby
1 EPA-permitted facility operate within about 5 miles of Big Moon Lake at under Clean Water Act (NPDES) discharge permits. 1 facility has a reported Clean Water Act violation in the past three years.
- Almena Village OfAlmena · 1.1 mi away · NPDES WI0023183Recent violation
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 #14 of 28 lakes in Barron County
Nearby Lakes in Barron County
Frequently asked questions about Big Moon Lake at
Where is Big Moon Lake at?
- Big Moon Lake at is a lake in Barron County, Wisconsin. LakeQuality grades it B for nutrients and algae. The letter is not a swimming clearance.
What is the water quality grade for Big Moon Lake at?
- Big Moon Lake at in Barron County, Wisconsin has a water quality grade of B (Good). Water clarity: 10 ft visibility. Phosphorus: 23.3 µg/L. Maximum depth: 48 ft. Surface area: 187 acres.
Is Big Moon Lake at safe to swim in?
- Good for swimming, clear water with low algae levels. Big Moon Lake at has a water quality grade of B (Good). Always check local health department advisories before swimming.
How deep is Big Moon Lake at?
- Big Moon Lake at has a maximum depth of 48 feet. The lake covers 187 acres.
What fish are in Big Moon Lake at?
- Fish species found in Big Moon Lake at include Musky, Panfish, Largemouth Bass, Northern Pike, Walleye. Big Moon Lake at is located in Barron County, Wisconsin.
What did the DNR fisheries survey find at Big Moon Lake at?
- Wisconsin DNR lists Panfish as common on Big Moon Lake at. A DNR fisheries survey reports fish abundance and catch rates, not a water-quality grade. LakeQuality grades Big Moon Lake at B from EPA Water Quality Portal chemistry, and the water-quality trend over 6 years of monitoring is stable. Catch rate is not a swim clearance and is not a weekly bite report.
Are there boat ramps on Big Moon Lake at?
- Big Moon Lake at has 1 documented boat landing in the USGS National Boat Ramps inventory. Named access points include Big Moon Lake. Public access is listed as yes.
Explore Big Moon Lake at across LakeQuality
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Moderate nutrients, good water quality
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Where this data comes from
25 measurements from 1 monitoring station, 2020–2026. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- Wisconsin Department of Natural Resources
WIDNR_WQX25 samples · 2020–2026
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
Impairment status from EPA ATTAINS 303(d) database
Regulated discharger data from EPA ECHO (ICIS-NPDES)
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