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Cody Lake

Rice County, MinnesotaHypereutrophic

On the LakeGrade rubric Cody Lake fails the cutoffs — a TSI of 76 and persistent algal pressure put it in the bottom tier. Clarity, phosphorus, and chlorophyll-a all rate similarly, so there is no obvious single lever to pull on watershed management.

Hypereutrophic conditions mean the lake is operating at the upper end of the productivity scale, with all the bloom risk that implies. A maximum depth of just 14 ft means sediment-bound phosphorus releases back into the water column whenever wind stirs the bottom — a classic shallow-lake dynamic. At 259 acres, Cody Lake fits the Minnesota median for monitored lakes, with 5.1 miles of shoreline. Cody Lake ranks 16 of 17 in Rice County — at the lower end of the locally monitored distribution.

No invasive species are currently listed at Cody Lake — the lake remains off the Minnesota infested-waters roster. The fishery includes walleye alongside the lake's other 7 documented species — a notable draw for Minnesota anglers. No formal public access is documented at Cody Lake — most use is by shoreline residents and their guests. The lake has a partial ice record — 13 observed ice-outs, centered near Mar 30. The grade is supported by multiple sampling years from Minnesota PCA volunteers and partner agencies, giving the letter a reasonably stable foundation.

Source: EPA Water Quality Portal sampling records, Minnesota DNR LakeFinder, last sampled 2025-09-10. Grade methodology: LakeGrade methodology.

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Swimming Safety

Avoid swimming, very poor water quality, potential algae toxins

Water Quality Grade: F, Very Poor

Very murky, less than 2 ft of visibility. Phosphorus level: 302 µg/L. Chlorophyll-a: 97 µg/L. Trophic State Index: 76.

MetricValueGrade
Water Clarity (Secchi Depth)2 ftF
Phosphorus302 µg/LF
Chlorophyll-a (Algae)97 µg/LF
Trophic State Index (TSI)76Hypereutrophic

Very high nutrients, dense algae, poor clarity

Lake Details

CharacteristicValue
Maximum Depth14 ft
Surface Area259.34 acres
Shoreline Length5.1 mi
Littoral Zone100%
Public AccessNo

Fish Species

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

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

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

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

Ice Season

Historical ice data from Minnesota DNR (15 observations).

Typical Ice-Out
Mar 30
EarliestLatest
Ice-Out2024-03-02 (2024)2018-04-28 (2018)
Ice-In2025-11-28 (2025)2024-11-29 (2024)

Most recent ice-out: 2025-03-19

Location

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County Ranking

Ranked #16 of 17 lakes in Rice County

Cleaner Lakes Within 30 Miles

Cody Lake holds Grade F. One nearby lake has a higher grade.

See full comparison →

Nearby Lakes in Rice County

Hypereutrophic Lakes in Minnesota

EPA Impairment Status

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

Causes of impairment

Nutrients (phosphorus, nitrogen)

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

Source: EPA ATTAINS assessment unit MN66-0061-00 · 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

Lake details from Minnesota DNR LakeFinder

Ice data from Minnesota DNR Climate

Most recent sample: 2025-09-10

Monitoring stations: 1