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.

How deep is Lake Julia?

Lake Julia has a maximum depth of 19 feet. The lake covers 241 acres.

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.

Can I fish at Lake Julia?

Lake Julia has 1 documented boat landing in the USGS National Boat Ramps inventory. 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.

Lake Julia

Oneida County, Wisconsin241 acresView map Directions

Wisconsin DNR publishes the water-quality measurements for Lake Julia. Here is what has been measured.

Clarity

9.9 ft

Typical for Wisconsin

Secchi · sampled 2026

Phosphorus

14.3 µg/L

Typical for Wisconsin

Measured by Wisconsin DNR

Max depth

19 ft

Bathymetric survey

Area

241 acres

Surface area

Type

Mesotrophic

Trophic class

Trend

Improving

6 years of samples

Mesotrophic
19 ft max depth
Public access

See the measurements Directions Where to stay

Lake Julia in Oneida County, Wisconsin has water-quality measurements published by Wisconsin DNR, shown here as reported. 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 →

Loading map…

Lake Julia is a 241-acre mesotrophic lake in Oneida County, Wisconsin with a maximum depth of 19 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 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. Methodology: how these readings are compared.

What Lake Julia is good for

From access and monitoring records, not editorial picks.

Clear water9.9 ft of visibility
Boat launch1 documented ramp
Fishing6 species recorded

Swimming conditions

Readings only

Low 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 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.

Compare swimming lakes near Rhinelander →

Get alerts for Lake Julia →

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.

Good clarity, visible to about 9.9 ft. Phosphorus 14.3 µg/L. TSI 43.

Water quality readings
Measure	Reading	Where it sits
Water clarity (Secchi depth)	9.9ft	Measured, not scored How deep a black-and-white disk stays visible from the surface. Higher is clearer.
Total phosphorus	14.3µg/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.	43	Mesotrophic OligotrophicMesotrophicEutrophicHypereutrophic

Moderate nutrients, good water quality

Ask about Lake Julia

Answers come straight from the public measurements and survey records on this page.

DNR fisheries survey

Wisconsin DNR rates Panfish as abundant 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 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).

DNR Assessment

Excellent · Shallow Seepage lake

Trophic State Index 44 (mesotrophic) · 5-year average

Fish Species (DNR-rated)

Panfish(Abundant)Musky(Present)Largemouth Bass(Present)Smallmouth Bass(Present)Northern Pike(Present)Walleye(Present)

Contour map (PDF) →Full WI DNR LakePage →Water quality stations →

Lake Details

Max depth

19 ft

Surface area

241 acres

Public access

Yes

Listed by Wisconsin DNR

Lake Size & Watershed

Watershed (drainage) area

2 sq mi

HydroLAKES / HydroSHEDS

Shoreline

2.9 mi

HydroLAKES / HydroSHEDS

Elevation

1,552 ft

Size, shoreline, and watershed area from HydroLAKES (HydroSHEDS).

Recreation & Access

Boat Landings

Yes

Public Access

Julia LakePublic

Named access points in the USGS National Boat Ramps inventory, within about 3 miles. More lakes with boat ramps

Stays via Stay22

Stays 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

Prices for Oct 16–18, 4 adults. Change dates on the map below.

Availability and prices from Stay22 partners (Booking.com, Vrbo, Expedia). We may earn a commission from bookings, at no extra cost to you.

Planning a whole trip? See where to stay at Wisconsin’s top lakes →

Follow Lake Julia’s readings

Email me when new measurements post for this lake. Updates stay free.

Or email

Fish Species

Musky Panfish Largemouth Bass Smallmouth Bass Northern Pike Walleye

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.

Chinese Mystery Snail

Water Quality Trend: Improving

Based on 6 years of monitoring (2020–2025).

Water clarity
Improving
4 years
Phosphorus
Stable
-0.03 µg/L/yr6 years

See year-by-year chart →

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 Of
Rhinelander · 1.2 mi away · NPDES WI0020044
MajorRecent 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.

Nearby Lakes in Oneida County

Buck Lake—View →Hanson Lake12.6 ft clear—View →Gross Lake—View →Hixon Lake—View →Cuenin Lake—View →Boom Lake4.5 ft clear—View →

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: 9.9 ft visibility. Phosphorus: 14.3 µg/L. Maximum depth: 19 ft. Surface area: 241 acres.
Is Lake Julia safe to swim in?: Nutrient and algae readings are not a swimming clearance. Check local advisories before you swim.
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 water quality. LakeQuality shows Lake Julia’s water-quality measurements separately, 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.
Can I fish at Lake Julia?: Lake Julia has 1 documented boat landing in the USGS National Boat Ramps inventory. 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

Wakesurfing on Lake Julia

Depth, room, public access, and the state wake-sport rules

Wisconsin Fishing Guide

Fish species and the cleanest lakes across Wisconsin

Oneida County Fishing

Fish species and best lakes in Oneida County

Lake Fishing Forecast

Species activity outlook by water temperature and season

Northwoods Wisconsin

Top lakes and where to stay in the Northwoods Wisconsin area

Minocqua Chain

Top lakes and where to stay in the Minocqua Chain area

Wisconsin Lake Trips

Where to stay at Wisconsin's top lakes, each with its readings

Wisconsin River Watershed

Lakes in the Wisconsin River Watershed, ranked by water quality

The State of Wisconsin's Lakes

Wisconsin's cleanest lakes, ranked on agency measurements

More lakes in Wisconsin

Clearest lakes in Wisconsin

Ranked by Secchi water clarity

All Wisconsin lakes

Every Wisconsin lake with its Wisconsin DNR measurements

Lake water quality by country

Official ratings and named-lake measurements

Other Lakes in Wisconsin

Lake Buteau

Lincoln County · 19.4 ft

Seven Island Lake

Lincoln County · 14 ft

Long Lake

Lincoln County · 14.5 ft

Pickerel Lake

Lincoln County · Measured

Bass Lake

Lincoln County · 12.5 ft

Mcdonald Lake

Vilas County · 8.6 ft

Mesotrophic Lakes in Wisconsin

Hilderbrand Lake Pickerel Lake Bass Lake Mcdonald Lake

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 ResourcesWIDNR_WQX38 samples · 2020–2026

Analytical methods

Phosphorus by Colorimetry
Total Phosphorus After Block Digestion
2130 B ~ Nephelometric Method

Monitoring station identifiers (2)

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.