Mid Lake
Oneida County, Wisconsin221 acresView mapDirections
Wisconsin DNR publishes the water-quality measurements for Mid Lake. Here is what has been measured.
- Mesotrophic
- 4 aquatic invasives
- 12 ft max depth
- Public access
Mid Lake in Oneida County, Wisconsin has water-quality measurements published by Wisconsin DNR, shown here as reported. 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 →
Mid Lake is a 221-acre mesotrophic lake in Oneida County, Wisconsin with a maximum depth of 12 feet. 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. 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. Methodology: how these readings are compared.
What Mid Lake is good for
From access and monitoring records, not editorial picks.
- Fishing6 species recorded
Swimming conditions
Readings onlyLow algae
Based on clarity and algae readings from past sampling — there is no live water temperature and a current cyanobacteria reading for this lake. Check your state or county health department before you swim.
Nutrient and algae readings are not a swimming clearance. Check local advisories before you swim.
Whether Mid Lake is safe to swim in today is a call for the Wisconsin Department of Natural Resources and the county health department, who post current advisories. LakeQuality does not issue swimming clearances.
Water quality measurements for Mid Lake
These are the measurements Wisconsin DNR publishes for Mid Lake, shown as reported. The condition class beside each reading is the EPA National Lakes Assessment class for this lake’s ecoregion.
Moderate clarity, visible to about 7 ft. Phosphorus 23.7 µg/L. TSI 49.
| Measure | Reading | Where it sits |
|---|---|---|
| Water clarity (Secchi depth) | 7ft | Measured, not scored How deep a black-and-white disk stays visible from the surface. Higher is clearer. |
| Total phosphorus | 23.7µg/L | Good GoodFairPoor |
| Chlorophyll-a (algae) | No reading The green pigment in algae — a direct measure of how much algae is in the water. | |
| Trophic state (TSI)Carlson's 0–100 index of how much algae a lake can support, from clarity, phosphorus and chlorophyll-a. | 49 | Mesotrophic OligotrophicMesotrophicEutrophicHypereutrophic |
Moderate nutrients, good water quality
Ask about Mid Lake
Answers come straight from the public measurements and survey records on this page.
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.
Column height runs from this lake’s coldest month (70°F) to its warmest (75°F).
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 water quality. LakeQuality shows Mid Lake’s water-quality measurements separately, 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
Max depth
12 ft
Surface area
221 acres
Public access
Yes
Listed by Wisconsin DNR
Lake Size & Watershed
Watershed (drainage) area
1 sq mi
HydroLAKES / HydroSHEDS
Shoreline
2.7 mi
HydroLAKES / HydroSHEDS
Elevation
1,581 ft
Size, shoreline, and watershed area from HydroLAKES (HydroSHEDS).
Stays via Stay22
Stays 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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Follow Mid Lake’s readings
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Fish Species
Click a species to see every 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 (2020–2026).
Water clarity
Improving7 years
Phosphorus
Improving-1.47 µg/L/yr7 years
Nearby Lakes in Oneida County
Frequently asked questions about Mid Lake
Where is Mid Lake?
- Mid Lake is a lake in Oneida County, Wisconsin. Its water-quality measurements are published by Wisconsin DNR and shown on this page as reported.
What is the water quality of Mid Lake?
- Mid Lake in Oneida County, Wisconsin has water-quality measurements published by Wisconsin DNR, shown here as reported. 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?
- Nutrient and algae readings are not a swimming clearance. Check local advisories before you swim.
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 water quality. LakeQuality shows Mid Lake’s water-quality measurements separately, 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.
Can I fish at Mid Lake?
- Public access to Mid Lake is listed as yes on the lake record. Seasons, size and bag limits, and whether you need a license are set by Wisconsin's fish and wildlife agency, so check its current regulations before you go.
Explore Mid Lake across LakeQuality
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Fish species and best lakes in Oneida County
Species activity outlook by water temperature and season
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Where to stay at Wisconsin's top lakes, each with its readings
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Wisconsin's cleanest lakes, ranked on agency measurements
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Mesotrophic Lakes in Wisconsin
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)
EPA condition classes from the National Lakes Assessment (EPA 841-R-24-006, Table 6-3), applied by ecoregion. See where the data comes from and data sources.
Other records on this page
Lake size & watershed from HydroLAKES (HydroSHEDS)
Fish and recreation data from Wisconsin DNR Lakes