Lake Julia
Lake Julia in Oneida County, Wisconsin has a water quality grade of B (Good). 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 →
- Clarity
- 7 ft
- Max depth
- 45 ft
- Area
- 404 acres
- Type
- Mesotrophic
- Trend
- ↓ Declining
- Public access
- Yes
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Lake Julia is a 404-acre mesotrophic lake in Oneida County, Wisconsin with a maximum depth of 45 feet. Water quality is graded B based on 1 sampling years through 2025. 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. Grade methodology: LakeGrade 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)
Moderate clarity, visible to about 7 ft. Phosphorus level: 11.2 µg/L. Trophic State Index: 44.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 7 ft | Not graded |
| Phosphorus | 11.2 µg/L | Good |
| Chlorophyll-a (Algae) | No recent samples | |
| Trophic State Index (TSI) | 44 | Mesotrophic |
Moderate nutrients, good water quality
Where to stay near Lake Julia
Compare lakeside cabins, hotels, and vacation rentals near Lake Julia 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 Lake Julia
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Wisconsin DNR lists Musky as common on Lake Julia.
A DNR fisheries survey reports fish abundance and catch rates, not a water-quality grade. LakeQuality grades Lake Julia B from EPA Water Quality Portal chemistry, 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
| Characteristic | Value |
|---|---|
| Maximum Depth | 45 ft |
| Surface Area | 404 acres |
| Public Access | Yes |
Lake Size & Watershed
Size, shoreline, and watershed area from HydroLAKES (HydroSHEDS).
Fish Species
Click a species to see every graded 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 Trend: ↓ Declining
Based on 2 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Water Clarity | ↓ Declining | -1.5 m/yr | 2 |
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
Source: EPA ATTAINS assessment unit WI10008945 · Official waterbody report
County Ranking
Ranked #39 of 67 lakes in Oneida County
Nearby Lakes in Oneida County
Frequently asked questions about Lake Julia
Where is Lake Julia?
- Lake Julia 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 Lake Julia?
- Lake Julia in Oneida County, Wisconsin has a water quality grade of B (Good). 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?
- Good for swimming, clear water with low algae levels. Lake Julia has a water quality grade of B (Good). Always check local health department advisories before swimming.
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 a water-quality grade. LakeQuality grades Lake Julia B from EPA Water Quality Portal chemistry, 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.
Explore Lake Julia across LakeGrade
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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)
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