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.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 2 ft | F |
| Phosphorus | 302 µg/L | F |
| Chlorophyll-a (Algae) | 97 µg/L | F |
| Trophic State Index (TSI) | 76 | Hypereutrophic |
Very high nutrients, dense algae, poor clarity
Lake Details
| Characteristic | Value |
|---|---|
| Maximum Depth | 14 ft |
| Surface Area | 259.34 acres |
| Shoreline Length | 5.1 mi |
| Littoral Zone | 100% |
| Public Access | No |
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).
| Earliest | Latest | |
|---|---|---|
| Ice-Out | 2024-03-02 (2024) | 2018-04-28 (2018) |
| Ice-In | 2025-11-28 (2025) | 2024-11-29 (2024) |
Most recent ice-out: 2025-03-19
Location
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
More Minnesota Lake Rankings
State Parks Near Cody Lake
Other Grade F Lakes in Minnesota
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
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