Lake Julia
Lake Julia in Oneida County, Wisconsin has a water quality grade of B (Good). Water clarity: 9.9 ft visibility. Phosphorus: 14.3 µg/L. Maximum depth: 19 ft. Surface area: 241 acres.
Wisconsin DNR rates Panfish as abundant on Lake Julia. DNR survey details →
- Clarity
- 9.9 ft
- Max depth
- 19 ft
- Area
- 241 acres
- Type
- Mesotrophic
- Trend
- ↑ Improving
- Public access
- Yes
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Lake Julia is a 241-acre mesotrophic lake in Oneida County, Wisconsin with a maximum depth of 19 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, Lake Julia ranks #38 for water quality.
Source: EPA Water Quality Portal sampling records, Wisconsin DNR Surface Water, last sampled 2026-05-06. 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)
Good clarity, visible to about 9.9 ft. Phosphorus level: 14.3 µg/L. Trophic State Index: 43.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 9.9 ft | Not graded |
| Phosphorus | 14.3 µg/L | Good |
| Chlorophyll-a (Algae) | No recent samples | |
| Trophic State Index (TSI) | 43 | 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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Planning a whole trip? See where to stay at Wisconsin’s top lakes →
Wisconsin DNR rates Panfish as abundant 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 6 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 1995. 1 station on file (most recent sample 2025).
Fish Species (DNR-rated)
Lake Details
| Characteristic | Value |
|---|---|
| Maximum Depth | 19 ft |
| Surface Area | 241 acres |
| Public Access | Yes |
Lake Size & Watershed
Size, shoreline, and watershed area from HydroLAKES (HydroSHEDS).
Recreation & Access
- Julia 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 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: ↑ Improving
Based on 6 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Water Clarity | ↑ Improving | +0.419 m/yr | 4 |
| Phosphorus | → Stable | -0.03 µg/L/yr | 6 |
Regulated Pollution Sources Nearby
1 EPA-permitted facility operate within about 5 miles of Lake Julia under Clean Water Act (NPDES) discharge permits, including 1 classified by the EPA as major discharger. 1 facility has a reported Clean Water Act violation in the past three years.
- Rhinelander City OfRhinelander · 1.2 mi away · NPDES WI0020044MajorRecent violation
Facilities permitted to discharge under the Clean Water Act within ~5 miles; proximity does not by itself mean a facility affects this lake. Source: EPA ECHO (ICIS-NPDES), as of 2026-07.
County Ranking
Ranked #38 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: 9.9 ft visibility. Phosphorus: 14.3 µg/L. Maximum depth: 19 ft. Surface area: 241 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 19 feet. The lake covers 241 acres.
What fish are in Lake Julia?
- Fish species found in Lake Julia include Musky, Panfish, Largemouth Bass, Smallmouth Bass, Northern Pike, Walleye. Lake Julia is located in Oneida County, Wisconsin.
What did the DNR fisheries survey find at Lake Julia?
- Wisconsin DNR rates Panfish as abundant 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 6 years of monitoring is improving. Catch rate is not a swim clearance and is not a weekly bite report.
Are there boat ramps on Lake Julia?
- Lake Julia has 1 documented boat landing in the USGS National Boat Ramps inventory. Named access points include Julia Lake. Public access is listed as yes.
Explore Lake Julia across LakeQuality
Depth, room, public access, and the state wake-sport rules
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Species activity outlook by water temperature and season
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Moderate nutrients, good water quality
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More Wisconsin Lake Rankings
Other Grade B Lakes in Wisconsin
Mesotrophic Lakes in Wisconsin
Where this data comes from
38 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_WQX38 samples · 2020–2026
Analytical methods
- Phosphorus by Colorimetry
- Total Phosphorus After Block Digestion
- 2130 B ~ Nephelometric Method
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
Regulated discharger data from EPA ECHO (ICIS-NPDES)
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