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LakeQuality
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Hill Lake

Oneida County, WisconsinLimited DataOligotrophic

On the LakeGrade rubric, Hill Lake pulls an A: clarity at 39.4 ft and phosphorus readings still being added put it in the top bracket for Wisconsin. Clarity, phosphorus, and chlorophyll-a all rate similarly, so there is no obvious single lever to pull on watershed management.

The lake's low TSI puts it in oligotrophic territory — the cleanest of the four trophic classes, but also the most vulnerable to nutrient-driven shifts. A maximum depth of 40 ft puts Hill Lake in the middle of Wisconsin's depth distribution. The lake is compact at 33 acres, with partial shoreline records and little volume to buffer nutrient inputs. Among the 140 graded lakes in Oneida County, Hill Lake sits at rank 65, above the county median.

No invasive species are currently listed at Hill Lake — the lake remains off the Wisconsin infested-waters roster. The fishery is bass-led, with 4 documented species across the lake's records. The grade is based on limited monitoring — fewer than three independent measurement years contribute, so future updates may shift the letter.

Source: EPA Water Quality Portal sampling records, Wisconsin DNR Surface Water, last sampled 2025-10-13. Grade methodology: LakeGrade methodology.

Swimming Safety

Excellent for swimming, crystal clear water with minimal algae

Water Quality Grade: A, Excellent

Crystal clear, you can see 39.4 ft down. Trophic State Index: 24.

MetricValueGrade
Water Clarity (Secchi Depth)39.4 ftA
PhosphorusNo data
Chlorophyll-a (Algae)No data
Trophic State Index (TSI)24Oligotrophic

Low nutrients, clear water, excellent for swimming

Lake Details

CharacteristicValue
Maximum Depth40 ft
Surface Area33 acres

Fish Species

Click a species to see all Wisconsin and Minnesota lakes where it is found.

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

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

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

Water Quality Trend: Stable

Based on 6 years of monitoring data (2020-2025).

MetricTrendChange/YearYears
Water Clarity Stable+0.185 m/yr6
See year-by-year chart →

Location

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County Ranking

Ranked #65 of 140 lakes in Oneida County

Nearby Lakes in Oneida County

WI DNR Lake Profile

Authoritative data from the Wisconsin DNR LakePages. Monitored by volunteers since 2017. 2 stations on file (most recent sample 2025).

DNR Assessment
Excellent · Deep Seepage lake
Trophic State Index 33 (oligotrophic) · 5-year average

Fish Species (DNR-rated)

Panfish(Common)Largemouth Bass(Common)Musky(Present)Northern Pike(Present)

Data Sources

Water quality data from the EPA Water Quality Portal

Grading methodology based on Metropolitan Council standards

Fish and recreation data from Wisconsin DNR Lakes

Most recent sample: 2025-10-13

Monitoring stations: 1