Moon Lake
Moon Lake in Barron County, Wisconsin has a water quality grade of C (Fair). Phosphorus: 39.9 µg/L. Maximum depth: 5 ft. Surface area: 74 acres.
- Max depth
- 5 ft
- Area
- 74 acres
- Type
- Eutrophic
- Trend
- → Stable
- Public access
- Yes
Next lake in Barron County
Moon Lake is a 74-acre productive, nutrient-rich eutrophic lake in Barron County, Wisconsin with a maximum depth of 5 feet. Water quality is graded C based on 1 sampling years through 2025. The lake supports 2 documented fish species including Panfish and Northern Pike. Public access is available with 1 public boat landing. Compared to the 27 other monitored lakes in Barron County, Moon Lake ranks #20 for water quality.
Source: EPA Water Quality Portal sampling records, Wisconsin DNR Surface Water, last sampled 2025-07-30. Grade methodology: LakeGrade methodology.
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Swimming Safety
Grade onlyModerate
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.
Generally safe for swimming, moderate water quality
Water Quality Grade: C (Fair)
No clarity data. Phosphorus level: 39.9 µg/L. Trophic State Index: 57.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | No recent samples | |
| Phosphorus | 39.9 µg/L | Fair |
| Chlorophyll-a (Algae) | No recent samples | |
| Trophic State Index (TSI) | 57 | Eutrophic |
High nutrients, frequent algae, reduced clarity
Where to stay near Moon Lake
Compare lakeside cabins, hotels, and vacation rentals near Moon Lake 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.
Top-rated places to stay near Moon Lake
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Lake Details
| Characteristic | Value |
|---|---|
| Maximum Depth | 5 ft |
| Surface Area | 74 acres |
| Public Access | Yes |
Lake Size & Watershed
Size, shoreline, and watershed area from HydroLAKES (HydroSHEDS).
Recreation & Access
- 19th Street Bridge SawyerPublic
Fish Species
Click a species to see every graded lake where it is documented.
Fishing Moon 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 2013. 1 station on file (most recent sample 2025).
Fish Species (DNR-rated)
DNR Reports & Resources
Wisconsin DNR Fisheries scientists publish multi-year survey reports for Moon Lake 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).
- 2021Big Moon Lake comprehensive survey, 2021Comprehensive Survey · WI DNR · 2021 (PDF)
Water Quality Trend: → Stable
Based on 7 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Water Clarity | → Stable | +0.02 m/yr | 7 |
| Phosphorus | → Stable | -0.5 µg/L/yr | 7 |
EPA Impairment Status
Moon Lake 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 WI10006654 · Official waterbody report
County Ranking
Ranked #20 of 28 lakes in Barron County
Nearby Lakes in Barron County
Frequently asked questions about Moon Lake
What is the water quality grade for Moon Lake?
- Moon Lake in Barron County, Wisconsin has a water quality grade of C (Fair). Phosphorus: 39.9 µg/L. Maximum depth: 5 ft. Surface area: 74 acres.
Is Moon Lake safe to swim in?
- Generally safe for swimming, moderate water quality. Moon Lake has a water quality grade of C (Fair). Always check local health department advisories before swimming.
How deep is Moon Lake?
- Moon Lake has a maximum depth of 5 feet. The lake covers 74 acres.
What fish are in Moon Lake?
- Fish species found in Moon Lake include Panfish, Northern Pike. Moon Lake is located in Barron County, Wisconsin.
Are there boat ramps on Moon Lake?
- Moon Lake has 1 documented boat landing in the USGS National Boat Ramps inventory. Named access points include 19th Street Bridge Sawyer. Public access is listed as yes.
Explore Moon Lake across LakeGrade
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High nutrients, frequent algae, reduced clarity
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Where this data comes from
12 measurements from 2 monitoring stations, 2020–2025. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- Wisconsin Department of Natural Resources
WIDNR_WQX12 samples · 2020–2025
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
Impairment status from EPA ATTAINS 303(d) database
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