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LakeQuality
F

Ox Yoke Lake

Hennepin County, MinnesotaHypereutrophic

Ox Yoke Lake earns an F: 396 µg/L of phosphorus and clarity at 2.6 ft signal heavy nutrient loading from the surrounding watershed. Sub-grades cluster within a single letter of each other, which usually means the lake is in stable trophic balance rather than fighting one specific stressor.

The hypereutrophic status — TSI 77 — reflects sustained heavy nutrient loading from the surrounding watershed and frequent algal pressure. The lake's maximum depth is not yet documented in state morphometric records — context for its physical structure remains limited. The lake's surface area is not consistently recorded across state datasets — physical context remains partial. Within Hennepin County's 95 graded lakes, Ox Yoke Lake ranks 68 — below the local median, though not at the bottom.

Ox Yoke Lake has no invasive species recorded in Minnesota state databases as of 2023, though prevention practices still apply at all access points. The state fisheries records do not list documented species for Ox Yoke Lake, which usually reflects a lack of formal fisheries survey work rather than an empty lake. No formal public access is documented at Ox Yoke Lake — most use is by shoreline residents and their guests. Ice-out has been recorded 12 times at Ox Yoke Lake, with a median around Mar 29. 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, Minnesota DNR LakeFinder, last sampled 2023-06-06. Grade methodology: LakeGrade methodology.

Swimming Safety

Avoid swimming, very poor water quality, potential algae toxins

Water Quality Grade: F, Very Poor

Very murky, less than 2.6 ft of visibility. Phosphorus level: 396 µg/L. Trophic State Index: 77.

MetricValueGrade
Water Clarity (Secchi Depth)2.6 ftF
Phosphorus396 µg/LF
Chlorophyll-a (Algae)No data
Trophic State Index (TSI)77Hypereutrophic

Very high nutrients, dense algae, poor clarity

Water Quality Trend: Improving

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

MetricTrendChange/YearYears
Water Clarity Improving+0.1 m/yr2

Ice Season

Historical ice data from Minnesota DNR (22 observations).

Typical Ice-Out
Mar 29
Typical Ice-In
Nov 20

Estimated open water season: 236 days

EarliestLatest
Ice-Out2016-03-12 (2016)2014-04-28 (2014)
Ice-In2017-11-05 (2017)2006-12-01 (2006)

Most recent ice-out: 2018-04-22

Location

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County Ranking

Ranked #68 of 95 lakes in Hennepin County

Nearby Lakes in Hennepin County

Hypereutrophic Lakes in Minnesota

Data Sources

Water quality data from the EPA Water Quality Portal

Grading methodology based on Metropolitan Council standards

Ice data from Minnesota DNR Climate

Most recent sample: 2023-06-06

Monitoring stations: 1