Mid Lake
Mid Lake in Oneida County, Wisconsin has a water quality grade of B (Good). Water clarity: 7 ft visibility. Phosphorus: 23.7 µg/L. Maximum depth: 12 ft. Surface area: 221 acres.
Wisconsin DNR lists Musky as common on Mid Lake. DNR survey details →
- Clarity
- 7 ft
- Typical in August
- 70°F
- Max depth
- 12 ft
- Area
- 221 acres
- Type
- Mesotrophic
- Trend
- ↑ Improving
- Public access
- Yes
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Mid Lake is a 221-acre mesotrophic lake in Oneida County, Wisconsin with a maximum depth of 12 feet. Water quality is graded B based on 1 sampling years through 2026. Overall water quality 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, Mid Lake ranks #16 for water quality.
Source: EPA Water Quality Portal sampling records, Wisconsin DNR Surface Water, last sampled 2026-06-15. 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)
Moderate clarity, visible to about 7 ft. Phosphorus level: 23.7 µg/L. Trophic State Index: 49.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 7 ft | Not graded |
| Phosphorus | 23.7 µg/L | Good |
| Chlorophyll-a (Algae) | No recent samples | |
| Trophic State Index (TSI) | 49 | Mesotrophic |
Moderate nutrients, good water quality
Where to stay near Mid Lake
Compare lakeside cabins, hotels, and vacation rentals near Mid 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 Mid Lake
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Planning a whole trip? See where to stay at Wisconsin’s top lakes →
Water Temperature
Mid Lake typically sits around 70°F at the surface in August. Summer average is about 72°F. Usually warmest in Jul (about 75°F) and coldest in Jun (about 70°F). These are typical values by month — not a live reading.
Typical surface water temperature by month, from 18 field readings (2024–2026) via the EPA Water Quality Portal. See the full Mid Lake water temperature breakdown →
Wisconsin DNR lists Musky as common on Mid Lake.
A DNR fisheries survey reports fish abundance and catch rates, not a water-quality grade. LakeQuality grades Mid Lake B from EPA Water Quality Portal chemistry, and the water-quality trend over 7 years of monitoring is improving. 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 2004. 2 stations on file (most recent sample 2025).
Fish Species (DNR-rated)
Lake Details
| Characteristic | Value |
|---|---|
| Maximum Depth | 12 ft |
| Surface Area | 221 acres |
| Public Access | Yes |
Lake Size & Watershed
Size, shoreline, and watershed area from HydroLAKES (HydroSHEDS).
Recreation & Access
- Tomahawk ThoroughfarePublic
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 Mid 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: ↑ Improving
Based on 7 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Water Clarity | ↑ Improving | +0.238 m/yr | 7 |
| Phosphorus | ↑ Improving | -1.47 µg/L/yr | 7 |
EPA Impairment Status
Mid 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 WI10008935 · Official waterbody report · Matched by proximity (2.42 km)
County Ranking
Ranked #16 of 67 lakes in Oneida County
Nearby Lakes in Oneida County
Frequently asked questions about Mid Lake
Where is Mid Lake?
- Mid 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 Mid Lake?
- Mid Lake in Oneida County, Wisconsin has a water quality grade of B (Good). Water clarity: 7 ft visibility. Phosphorus: 23.7 µg/L. Maximum depth: 12 ft. Surface area: 221 acres.
Is Mid Lake safe to swim in?
- Good for swimming, clear water with low algae levels. Mid Lake has a water quality grade of B (Good). Always check local health department advisories before swimming.
What is the water temperature of Mid Lake?
- Mid Lake typically sits around 70°F at the surface in August, from 18 EPA Water Quality Portal field readings (2024–2026). That is a typical value for the month, not a live reading.
How deep is Mid Lake?
- Mid Lake has a maximum depth of 12 feet. The lake covers 221 acres.
What fish are in Mid Lake?
- Fish species found in Mid Lake include Musky, Panfish, Largemouth Bass, Smallmouth Bass, Northern Pike, Walleye. Mid Lake is located in Oneida County, Wisconsin.
What did the DNR fisheries survey find at Mid Lake?
- Wisconsin DNR lists Musky as common on Mid Lake. A DNR fisheries survey reports fish abundance and catch rates, not a water-quality grade. LakeQuality grades Mid Lake B from EPA Water Quality Portal chemistry, and the water-quality trend over 7 years of monitoring is improving. Catch rate is not a swim clearance and is not a weekly bite report.
Are there boat ramps on Mid Lake?
- Mid Lake has 1 documented boat landing in the USGS National Boat Ramps inventory. Named access points include Tomahawk Thoroughfare. Public access is listed as yes.
Explore Mid Lake across LakeQuality
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Where this data comes from
44 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_WQX44 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