Maple Lake
Maple Lake in Oneida County, Wisconsin has a water quality grade of B (Good). Water clarity: 12.5 ft visibility. Phosphorus: 15.8 µg/L. Maximum depth: 15 ft. Surface area: 131 acres.
Wisconsin DNR lists Panfish as common on Maple Lake. DNR survey details →
- Clarity
- 12.5 ft
- Max depth
- 15 ft
- Area
- 131 acres
- Type
- Mesotrophic
- Trend
- → Stable
- Public access
- Yes
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Maple Lake is a 131-acre mesotrophic lake in Oneida County, Wisconsin with a maximum depth of 15 feet. Water quality is graded B based on 1 sampling years through 2025. Water clarity is improving over recent sampling years. The lake supports 5 documented fish species including Musky, Panfish, and Largemouth Bass. Public access is available with 2 public boat landings. Compared to the 66 other monitored lakes in Oneida County, Maple Lake ranks #26 for water quality.
Source: EPA Water Quality Portal sampling records, Wisconsin DNR Surface Water, last sampled 2025-09-04. 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.
Good for swimming, clear water with low algae levels
Water Quality Grade: B (Good)
Good clarity, visible to about 12.5 ft. Phosphorus level: 15.8 µg/L. Trophic State Index: 42.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 12.5 ft | Not graded |
| Phosphorus | 15.8 µg/L | Good |
| Chlorophyll-a (Algae) | No recent samples | |
| Trophic State Index (TSI) | 42 | Mesotrophic |
Moderate nutrients, good water quality
Where to stay near Maple Lake
Compare lakeside cabins, hotels, and vacation rentals near Maple 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.
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Wisconsin DNR lists Panfish as common on Maple Lake.
A DNR fisheries survey reports fish abundance and catch rates, not a water-quality grade. LakeQuality grades Maple Lake 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 1991. 4 stations on file (most recent sample 2025).
Fish Species (DNR-rated)
Lake Details
| Characteristic | Value |
|---|---|
| Maximum Depth | 15 ft |
| Surface Area | 131 acres |
| Public Access | Yes |
Lake Size & Watershed
Size, shoreline, and watershed area from HydroLAKES (HydroSHEDS).
Recreation & Access
- Townline LakePublic
- Maple 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 Maple 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 6 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Water Clarity | ↑ Improving | +0.657 m/yr | 6 |
| Phosphorus | ↓ Declining | +6.7 µg/L/yr | 2 |
Reservoir Info (USACE NID)
Maple Lake is a man-made reservoir impounded by the Maple Lake (completed 1941), built primarily for recreation on the OUTLET TO TOWN LINE LAKE; gravity-type dam, 12 ft tall and 85 ft long.
- Surface area
- 144 ac
- Normal storage
- 900 ac-ft
- Max storage
- 1,330 ac-ft
- Drainage area
- 1 sq mi
- Hazard class
- High
- Owner
- Town of Three Lakes
Source: USACE National Inventory of Dams, NID ID WI00282 · Operator website
EPA Impairment Status
Maple 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 WI10007412 · Official waterbody report · Matched by proximity (2.08 km)
Regulated Pollution Sources Nearby
1 EPA-permitted facility operate within about 5 miles of Maple Lake under Clean Water Act (NPDES) discharge permits. 1 facility has a reported Clean Water Act violation in the past three years.
- Three Lakes Sanitary District #1Three Lakes · 0.3 mi away · NPDES WI0022853Recent 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 #26 of 67 lakes in Oneida County
Nearby Lakes in Oneida County
Frequently asked questions about Maple Lake
Where is Maple Lake?
- Maple Lake is a lake in Oneida County, Wisconsin. LakeQuality grades it B for nutrients and algae. The letter is not a swimming clearance.
What is the water quality grade for Maple Lake?
- Maple Lake in Oneida County, Wisconsin has a water quality grade of B (Good). Water clarity: 12.5 ft visibility. Phosphorus: 15.8 µg/L. Maximum depth: 15 ft. Surface area: 131 acres.
Is Maple Lake safe to swim in?
- Good for swimming, clear water with low algae levels. Maple Lake has a water quality grade of B (Good). Always check local health department advisories before swimming.
How deep is Maple Lake?
- Maple Lake has a maximum depth of 15 feet. The lake covers 131 acres.
What fish are in Maple Lake?
- Fish species found in Maple Lake include Musky, Panfish, Largemouth Bass, Northern Pike, Walleye. Maple Lake is located in Oneida County, Wisconsin.
What did the DNR fisheries survey find at Maple Lake?
- Wisconsin DNR lists Panfish as common on Maple Lake. A DNR fisheries survey reports fish abundance and catch rates, not a water-quality grade. LakeQuality grades Maple Lake 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 Maple Lake?
- Maple Lake has 2 documented boat landings in the USGS National Boat Ramps inventory. Named access points include Townline Lake, Maple Lake. Public access is listed as yes.
Explore Maple Lake across LakeQuality
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Where this data comes from
40 measurements from 1 monitoring station, 2020–2025. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- Wisconsin Department of Natural Resources
WIDNR_WQX40 samples · 2020–2025
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