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B

Kelly Lake

Rice County, MinnesotaMesotrophic

Kelly Lake carries a solid B grade — strong on most parameters, with measurements that hold up well across the summer season. With clarity and phosphorus scored, the sub-grades cluster within a letter of each other, pointing to stable conditions rather than one specific stressor.

The lake sits in the mesotrophic zone — the band where most well-managed Minnesota lakes fall. 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. Kelly Lake ranks 1 of 12 in Rice County, putting it in the upper tier of locally monitored lakes.

No invasive species are currently listed at Kelly Lake — the lake remains off the Minnesota infested-waters roster. The state fisheries records do not list documented species for Kelly Lake, which usually reflects a lack of formal fisheries survey work rather than an empty lake. A documented public access point at Kelly Lake makes the lake usable for shore fishing, paddle craft, and trailered boats. The lake has a partial ice record — 13 observed ice-outs, centered near 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 2023-08-29. Grade methodology: LakeGrade methodology.

Reviewed by LakeQuality Editorial Team · Updated

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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 8.2 ft. Phosphorus level: 29 µg/L. Trophic State Index: 50.

MetricValueGrade
Water Clarity (Secchi Depth)8.2 ftC
Phosphorus29 µg/LB
Chlorophyll-a (Algae)No data
Trophic State Index (TSI)50Mesotrophic

Moderate nutrients, good water quality

Water Quality Trend: Declining

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

MetricTrendChange/YearYears
Phosphorus Declining+4.5 µg/L/yr2

Ice Season

Historical ice data from Minnesota DNR (22 observations).

Typical Ice-Out
Mar 29
Typical Ice-In
Dec 2

Estimated open water season: 248 days

EarliestLatest
Ice-Out2024-03-01 (2024)2018-04-29 (2018)
Ice-In2022-11-20 (2022)2015-12-19 (2015)

Most recent ice-out: 2026-03-26

Location

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County Ranking

Ranked #1 of 12 lakes in Rice County

Nearby Lakes in Rice County

DNR Reports & Resources

Minnesota DNR LakeFinder publishes lake survey, fish stocking, water access, and aquatic plant data for Kelly Lake. 2 reports on file.

EPA Impairment Status

Kelly Lake is officially listed as impaired under Clean Water Act §303(d) in the 2024 EPA reporting cycle (IR category 4A).

Causes of impairment

MercuryNutrients (phosphorus, nitrogen)

A Total Maximum Daily Load (TMDL) plan has been approved.

Source: EPA ATTAINS assessment unit MN66-0038-00 · Official waterbody report · Matched by proximity (2.32 km)

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

Ice data from Minnesota DNR Climate

Most recent sample: 2023-08-29

Monitoring stations: 1