Townline Lake
Townline Lake in Oneida County, Wisconsin has a water quality grade of C (Fair). Water clarity: 6.4 ft visibility. Phosphorus: 29.2 µg/L. Maximum depth: 19 ft. Surface area: 142 acres.
Wisconsin DNR lists Panfish as common on Townline Lake. DNR survey details →
- Clarity
- 6.4 ft
- Typical in July
- 65°F
- Max depth
- 19 ft
- Area
- 142 acres
- Type
- Eutrophic
- Trend
- → Stable
- Public access
- Yes
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Townline Lake is a 142-acre productive, nutrient-rich eutrophic lake in Oneida County, Wisconsin with a maximum depth of 19 feet. Water quality is graded C based on 1 sampling years through 2026. Water clarity is improving 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, Townline Lake ranks #53 for water quality.
Source: EPA Water Quality Portal sampling records, Wisconsin DNR Surface Water, last sampled 2026-02-24. 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.
Generally safe for swimming, moderate water quality
Water Quality Grade: C (Fair)
Murky, only visible to about 6.4 ft. Phosphorus level: 29.2 µg/L. Trophic State Index: 52.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 6.4 ft | Not graded |
| Phosphorus | 29.2 µg/L | Fair |
| Chlorophyll-a (Algae) | No recent samples | |
| Trophic State Index (TSI) | 52 | Eutrophic |
High nutrients, frequent algae, reduced clarity
Where to stay near Townline Lake
Compare lakeside cabins, hotels, and vacation rentals near Townline 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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Water Temperature
Townline Lake typically sits around 65°F at the surface in July. Summer average is about 66°F. Usually warmest in Jun (about 67°F) and coldest in Feb (about 38°F). These are typical values by month — not a live reading.
Typical surface water temperature by month, from 14 field readings (2025–2026) via the EPA Water Quality Portal. See the full Townline Lake water temperature breakdown →
Wisconsin DNR lists Panfish as common on Townline Lake.
A DNR fisheries survey reports fish abundance and catch rates, not a water-quality grade. LakeQuality grades Townline Lake C 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 1993. 2 stations on file (most recent sample 2026).
Fish Species (DNR-rated)
DNR Reports & Resources
Wisconsin DNR Fisheries scientists publish multi-year survey reports for Townline 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).
- 2025Townline Lake spring shocking survey, 2025Spring Shocking Survey · WI DNR · 2025 (PDF)
Lake Details
| Characteristic | Value |
|---|---|
| Maximum Depth | 19 ft |
| Surface Area | 142 acres |
| Public Access | Yes |
Recreation & Access
- Range Line 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 Townline 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)
Townline 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 · Matched by proximity (0.99 km)
EPA Impairment Status
Townline 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 (0.95 km)
County Ranking
Ranked #53 of 67 lakes in Oneida County
Nearby Lakes in Oneida County
Frequently asked questions about Townline Lake
Where is Townline Lake?
- Townline 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 Townline Lake?
- Townline Lake in Oneida County, Wisconsin has a water quality grade of C (Fair). Water clarity: 6.4 ft visibility. Phosphorus: 29.2 µg/L. Maximum depth: 19 ft. Surface area: 142 acres.
Is Townline Lake safe to swim in?
- Generally safe for swimming, moderate water quality. Townline Lake has a water quality grade of C (Fair). Always check local health department advisories before swimming.
What is the water temperature of Townline Lake?
- Townline Lake typically sits around 65°F at the surface in July, from 14 EPA Water Quality Portal field readings (2025–2026). That is a typical value for the month, not a live reading.
How deep is Townline Lake?
- Townline Lake has a maximum depth of 19 feet. The lake covers 142 acres.
What fish are in Townline Lake?
- Fish species found in Townline Lake include Musky, Panfish, Largemouth Bass, Smallmouth Bass, Northern Pike, Walleye. Townline Lake is located in Oneida County, Wisconsin.
What did the DNR fisheries survey find at Townline Lake?
- Wisconsin DNR lists Panfish as common on Townline Lake. A DNR fisheries survey reports fish abundance and catch rates, not a water-quality grade. LakeQuality grades Townline Lake C 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 Townline Lake?
- Townline Lake has 1 documented boat landing in the USGS National Boat Ramps inventory. Named access points include Range Line Lake. Public access is listed as yes.
Explore Townline Lake across LakeQuality
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Where this data comes from
73 measurements from 2 monitoring stations, 2020–2026. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- Wisconsin Department of Natural Resources
WIDNR_WQX73 samples · 2020–2026
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