Moen Lake
Moen Lake in Oneida County, Wisconsin has a water quality grade of C (Fair). Water clarity: 2.8 ft visibility. Phosphorus: 31 µg/L. Maximum depth: 11 ft. Surface area: 461 acres.
Wisconsin DNR lists Musky as common on Moen Lake. DNR survey details →
- Clarity
- 2.8 ft
- Typical in August
- 71°F
- Max depth
- 11 ft
- Area
- 461 acres
- Type
- Eutrophic
- Trend
- → Stable
- Public access
- Yes
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Moen Lake is a 461-acre productive, nutrient-rich eutrophic lake in Oneida County, Wisconsin with a maximum depth of 11 feet. Water quality is graded C based on 1 sampling years through 2026. Water clarity is declining over recent sampling years. The lake supports 6 documented fish species including Musky, Panfish, and Largemouth Bass. Public access is available with 1 public boat landing. Compared to the 66 other monitored lakes in Oneida County, Moen Lake ranks #57 for water quality.
Source: EPA Water Quality Portal sampling records, Wisconsin DNR Surface Water, last sampled 2026-07-11. Grade methodology: LakeQuality 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)
Very murky, less than 2.8 ft of visibility. Phosphorus level: 31 µg/L. Trophic State Index: 58.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 2.8 ft | Not graded |
| Phosphorus | 31 µg/L | Fair |
| Chlorophyll-a (Algae) | No recent samples | |
| Trophic State Index (TSI) | 58 | Eutrophic |
High nutrients, frequent algae, reduced clarity
Where to stay near Moen Lake
Compare lakeside cabins, hotels, and vacation rentals near Moen Lake in Oneida 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 Moen Lake
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Planning a whole trip? See where to stay at Wisconsin’s top lakes →
Water Temperature
Moen Lake typically sits around 71°F at the surface in August. Summer average is about 72°F. Usually warmest in Jul (about 75°F) and coldest in May (about 60°F). These are typical values by month — not a live reading.
Typical surface water temperature by month, from 58 field readings (2024–2026) via the EPA Water Quality Portal. See the full Moen Lake water temperature breakdown →
Blue-Green Algae (Cyanobacteria)
There’s no recent EPA CyAN cyanobacteria estimate for Moen Lake — clouds, ice, or an off-season gap in coverage. The most recent reading was high (337,287 cells/mL) on May 28, 2026.
Blue-green algae can appear and clear within days, so check your state’s current advisory before swimming. EPA CyAN ↗
Wisconsin DNR lists Musky as common on Moen Lake.
A DNR fisheries survey reports fish abundance and catch rates, not a water-quality grade. LakeQuality grades Moen Lake C from EPA Water Quality Portal chemistry, and the water-quality trend over 7 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 2006. 3 stations on file (most recent sample 2026).
Fish Species (DNR-rated)
Lake Details
| Characteristic | Value |
|---|---|
| Maximum Depth | 11 ft |
| Surface Area | 461 acres |
| Public Access | Yes |
Recreation & Access
- Moen 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 Moen 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.
Water Quality Trend: → Stable
Based on 7 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Water Clarity | ↓ Declining | -0.201 m/yr | 7 |
| Phosphorus | ↑ Improving | -0.79 µg/L/yr | 7 |
EPA Impairment Status
Moen Lake is officially listed as impaired under Clean Water Act §303(d) in the 2024 EPA reporting cycle (IR category 5).
Causes of impairment
Source: EPA ATTAINS assessment unit WI10008940 · Official waterbody report
County Ranking
Ranked #57 of 67 lakes in Oneida County
Nearby Lakes With Higher Grades
Moen Lake holds Grade C. 2 nearby lakes hold higher nutrient-and-algae grades — useful for a swim day, not a reason to skip lodging here.
See full comparison →Nearby Lakes in Oneida County
Frequently asked questions about Moen Lake
Where is Moen Lake?
- Moen Lake is a lake in Oneida County, Wisconsin. LakeQuality grades it C for nutrients and algae. The letter is not a swimming clearance.
What is the water quality grade for Moen Lake?
- Moen Lake in Oneida County, Wisconsin has a water quality grade of C (Fair). Water clarity: 2.8 ft visibility. Phosphorus: 31 µg/L. Maximum depth: 11 ft. Surface area: 461 acres.
Is Moen Lake safe to swim in?
- Generally safe for swimming, moderate water quality. Moen Lake has a water quality grade of C (Fair). Always check local health department advisories before swimming.
What is the water temperature of Moen Lake?
- Moen Lake typically sits around 71°F at the surface in August, from 58 EPA Water Quality Portal field readings (2024–2026). That is a typical value for the month, not a live reading.
How deep is Moen Lake?
- Moen Lake has a maximum depth of 11 feet. The lake covers 461 acres.
What fish are in Moen Lake?
- Fish species found in Moen Lake include Musky, Panfish, Largemouth Bass, Smallmouth Bass, Northern Pike, Walleye. Moen Lake is located in Oneida County, Wisconsin.
What did the DNR fisheries survey find at Moen Lake?
- Wisconsin DNR lists Musky as common on Moen Lake. A DNR fisheries survey reports fish abundance and catch rates, not a water-quality grade. LakeQuality grades Moen Lake C from EPA Water Quality Portal chemistry, and the water-quality trend over 7 years of monitoring is stable. Catch rate is not a swim clearance and is not a weekly bite report.
Does Moen Lake have blue-green algae?
- There is no recent EPA CyAN cyanobacteria estimate for Moen Lake (clouds, ice, or an off-season gap). The most recent reading was high (337,287 cells/mL). Blue-green algae can appear and clear within days, so check Wisconsin's current advisory before swimming.
Are there boat ramps on Moen Lake?
- Moen Lake has 1 documented boat landing in the USGS National Boat Ramps inventory. Named access points include Moen Lake. Public access is listed as yes.
Explore Moen Lake across LakeQuality
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Where this data comes from
67 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_WQX67 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
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