Lake Julia
Oneida County, Wisconsin404 acresView mapDirections
Wisconsin DNR publishes the water-quality measurements for Lake Julia. Here is what has been measured.
- Mesotrophic
- Impaired · Mercury
- 2 aquatic invasives
- 45 ft max depth
- Public access
- Limited data
Lake Julia in Oneida County, Wisconsin has water-quality measurements published by Wisconsin DNR, shown here as reported. Water clarity: 7 ft visibility. Phosphorus: 11.2 µg/L. Maximum depth: 45 ft. Surface area: 404 acres.
Wisconsin DNR lists Musky as common on Lake Julia. DNR survey details →
Lake Julia is a 404-acre mesotrophic lake in Oneida County, Wisconsin with a maximum depth of 45 feet. Overall water quality is declining over recent sampling years. The lake supports 7 documented fish species including Musky, Panfish, and Largemouth Bass. Public access is available. Compared to the 66 other monitored lakes in Oneida County, Lake Julia ranks #39 for water quality.
Source: EPA Water Quality Portal sampling records, Wisconsin DNR Surface Water, last sampled 2025-10-14. Methodology: how these readings are compared.
What Lake Julia is good for
From access and monitoring records, not editorial picks.
- Fishing7 species recorded
- Deep water45 ft surveyed max depth
Swimming conditions
Readings onlyLimited data
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. Lake Julia is listed impaired under Clean Water Act §303(d) (IR 5) for mercury. Check local advisories before you swim.
Whether Lake Julia 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 Lake Julia
These are the measurements Wisconsin DNR publishes for Lake Julia, 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 11.2 µg/L. TSI 44.
| 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 | 11.2µg/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. | 44 | Mesotrophic OligotrophicMesotrophicEutrophicHypereutrophic |
Moderate nutrients, good water quality
Ask about Lake Julia
Answers come straight from the public measurements and survey records on this page.
Wisconsin DNR lists Musky as common on Lake Julia.
A DNR fisheries survey reports fish abundance and catch rates, not water quality. LakeQuality shows Lake Julia’s water-quality measurements separately, and the water-quality trend over 2 years of monitoring is declining. 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. 1 station on file (most recent sample 2025).
Fish Species (DNR-rated)
Lake Details
Max depth
45 ft
Surface area
404 acres
Public access
Yes
Listed by Wisconsin DNR
Lake Size & Watershed
Watershed (drainage) area
18 sq mi
HydroLAKES / HydroSHEDS
Shoreline
6 mi
HydroLAKES / HydroSHEDS
Elevation
1,627 ft
Size, shoreline, and watershed area from HydroLAKES (HydroSHEDS).
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Stays near Lake Julia
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Fish Species
Click a species to see every lake where it is documented.
Fishing Lake Julia
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 readings over time
2 seasons of samples on record (2024–2025). Calling a direction takes at least 4 years of the same measurement.
Water clarity
Worsening2 years
EPA Impairment Status
Lake Julia is officially listed as impaired under Clean Water Act §303(d) in the 2024 EPA reporting cycle (IR category 5).
Causes of impairment
Designated uses not supporting: Fish consumption.
Source: EPA ATTAINS assessment unit WI10008945 · Official waterbody report
Nearby Lakes in Oneida County
Frequently asked questions about Lake Julia
Where is Lake Julia?
- Lake Julia 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 Lake Julia?
- Lake Julia in Oneida County, Wisconsin has water-quality measurements published by Wisconsin DNR, shown here as reported. Water clarity: 7 ft visibility. Phosphorus: 11.2 µg/L. Maximum depth: 45 ft. Surface area: 404 acres.
Is Lake Julia safe to swim in?
- Nutrient and algae readings are not a swimming clearance. Lake Julia is listed impaired under Clean Water Act §303(d) (IR 5) for mercury. Check local advisories before you swim.
How deep is Lake Julia?
- Lake Julia has a maximum depth of 45 feet. The lake covers 404 acres.
What fish are in Lake Julia?
- Fish species found in Lake Julia include Musky, Panfish, Largemouth Bass, Smallmouth Bass, Northern Pike, Trout, Walleye. Lake Julia is located in Oneida County, Wisconsin.
What did the DNR fisheries survey find at Lake Julia?
- Wisconsin DNR lists Musky as common on Lake Julia. A DNR fisheries survey reports fish abundance and catch rates, not water quality. LakeQuality shows Lake Julia’s water-quality measurements separately, and the water-quality trend over 2 years of monitoring is declining. Catch rate is not a swim clearance and is not a weekly bite report.
Can I fish at Lake Julia?
- Public access to Lake Julia 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 Lake Julia across LakeQuality
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Where this data comes from
13 measurements from 1 monitoring station, 2024–2025. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- Wisconsin Department of Natural Resources
WIDNR_WQX13 samples · 2024–2025
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
Impairment status from EPA ATTAINS 303(d) database
Lake size & watershed from HydroLAKES (HydroSHEDS)
Fish and recreation data from Wisconsin DNR Lakes