Gonz Lake
Wright County, MinnesotaLimited DataHypereutrophic
On the LakeGrade rubric Gonz Lake fails the cutoffs — a TSI of 88 and persistent algal pressure put it in the bottom tier.
A TSI above 70 puts Gonz Lake in hypereutrophic territory: visible blooms are common, and clarity rarely climbs even in early summer. 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. Gonz Lake ranks 64 of 64 in Wright County — at the lower end of the locally monitored distribution.
No invasive species are currently listed at Gonz Lake — the lake remains off the Minnesota infested-waters roster. The state fisheries records do not list documented species for Gonz Lake, which usually reflects a lack of formal fisheries survey work rather than an empty lake. No formal public access is documented at Gonz Lake — most use is by shoreline residents and their guests. 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 2021-09-15. 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
No clarity data. Phosphorus level: 338 µg/L. Trophic State Index: 88.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | No data | |
| Phosphorus | 338 µg/L | F |
| Chlorophyll-a (Algae) | No data | |
| Trophic State Index (TSI) | 88 | Hypereutrophic |
Very high nutrients, dense algae, poor clarity
Water Quality Trend: ↑ Improving
Based on 5 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Water Clarity | ↑ Improving | +0.1 m/yr | 3 |
| Phosphorus | ↑ Improving | -49.85 µg/L/yr | 5 |
Location
County Ranking
Ranked #64 of 64 lakes in Wright County
Cleaner Lakes Within 30 Miles
Gonz Lake holds Grade F. 4 nearby lakes hold higher grades.
Nearby Lakes in Wright County
More Minnesota Lake Rankings
State Parks Near Gonz Lake
Other Grade F Lakes in Minnesota
EPA Impairment Status
Gonz 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 MN86-0020-00 · Official waterbody report · Matched by proximity (1.87 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
Most recent sample: 2021-09-15
Monitoring stations: 2