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B

Lake Julia

Oneida County, WisconsinMesotrophic

On the LakeGrade scale Lake Julia grades a B, with clarity at 7.0 ft and 11 µg/L of phosphorus placing it above the Wisconsin median. Clarity is the limiting factor — phosphorus is reasonable but suspended particles or algal cells keep water transparency below Wisconsin norms.

The lake sits in the mesotrophic zone — the band where most well-managed Wisconsin lakes fall. Lake Julia reaches 45 ft at its deepest point — typical for Wisconsin mid-sized lakes, with seasonal stratification but limited cold-water refuge. At 404 acres, Lake Julia fits the Wisconsin median for monitored lakes, with partial shoreline records. Lake Julia ranks 49 of 134 in Oneida County — solidly in the upper half of the local distribution.

Lake Julia has at least one documented invasive species (Banded Mystery Snail), so boaters and anglers should observe clean-drain-dry steps when leaving the lake. Walleye are documented at Lake Julia, one of 7 fish species on record for the lake. A documented public access point at Lake Julia makes the lake usable for shore fishing, paddle craft, and trailered boats. Monitoring depth is thin here: the LakeGrade rubric is applied to a small number of sample years, and the grade will be revised as more data accumulates.

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

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.

MetricValueGrade
Water Clarity (Secchi Depth)7 ftC
Phosphorus11.2 µg/LA
Chlorophyll-a (Algae)No data
Trophic State Index (TSI)44Mesotrophic

Moderate nutrients, good water quality

Lake Details

CharacteristicValue
Maximum Depth45 ft
Surface Area404 acres
Public AccessYes

Fish Species

Click a species to see every graded lake where it is documented.

→ Best fishing times for Lake Julia (14-day solunar calendar)

→ Is it safe to eat fish from Lake Julia? (mercury & PFAS guide)

Lake Julia fishing regulations (limits, seasons, special rules)

Invasive & Introduced Species

Red chips are ecologically harmful invasive species. Gray chips are stocked or introduced fish that aren't a current ecological concern.

Banded Mystery SnailChinese Mystery SnailPurple LoosestrifeRusty Crayfish

Water Quality Trend: Declining

Based on 2 years of monitoring data (2020-2025).

MetricTrendChange/YearYears
Water Clarity Declining-1.5 m/yr2

Recreation & Access

1
Boat Landings
Yes
Public Access

Location

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County Ranking

Ranked #49 of 134 lakes in Oneida County

Cleaner Lakes Within 30 Miles

Lake Julia holds Grade B. One nearby lake has a higher grade.

See full comparison →

Nearby Lakes in Oneida County

WI DNR Lake Profile

Authoritative data from the Wisconsin DNR LakePages. 1 station on file (most recent sample 2025).

Fish Species (DNR-rated)

Musky(Common)Panfish(Present)Largemouth Bass(Present)Smallmouth Bass(Present)Northern Pike(Present)Trout(Present)Walleye(Present)

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

Mercury

Source: EPA ATTAINS assessment unit WI10008945 · Official waterbody report

Data Sources

Water quality data from the EPA Water Quality Portal

Impairment status from EPA ATTAINS 303(d) database

Grading methodology based on Metropolitan Council standards

Fish and recreation data from Wisconsin DNR Lakes

Public boat-access points from the USGS National Boat Ramps inventory

Most recent sample: 2025-10-14

Monitoring stations: 1

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.

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