Skip to main content
LakeQuality
B

Cate'S Lake

Scott County, MinnesotaMesotrophic

Cate'S Lake comes in at a B on the grading rubric — a respectable showing for a Minnesota lake of its size and depth. The lake's weakest score is on Secchi depth — the water looks more turbid than its phosphorus number alone would predict.

A TSI near 47 places Cate'S Lake in the mesotrophic band — moderate productivity, with seasonal swings between clearer spring water and richer late-summer conditions. 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. Among the 24 graded lakes in Scott County, Cate'S Lake ranks 4 — in the top quartile locally.

Eurasian watermilfoil is established at Cate'S Lake, which can dampen recreational access and pressure the native plant community. The state fisheries records do not list documented species for Cate'S Lake, which usually reflects a lack of formal fisheries survey work rather than an empty lake. The lake lacks a documented public access point, so visitor use is limited. 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 2024-10-18. Grade methodology: LakeGrade methodology.

Watch Cate'S Lake water quality

Subscribe for LakeQuality updates by email. No spam, unsubscribe anytime.

Swimming Safety

Good for swimming, clear water with low algae levels

Water Quality Grade: B, Good

Murky, only visible to about 5.6 ft. Phosphorus level: 20 µg/L. Chlorophyll-a: 3.1 µg/L. Trophic State Index: 47.

MetricValueGrade
Water Clarity (Secchi Depth)5.6 ftD
Phosphorus20 µg/LB
Chlorophyll-a (Algae)3.1 µg/LA
Trophic State Index (TSI)47Mesotrophic

Moderate nutrients, good water quality

Invasive & Introduced Species

Red chips are ecologically harmful invasive species. Gray chips are stocked or introduced fish that aren't a current ecological concern.

Eurasian watermilfoil

Water Quality Trend: Improving

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

MetricTrendChange/YearYears
Water Clarity Improving+2.82 m/yr2

Ice Season

Historical ice data from Minnesota DNR (17 observations).

Typical Ice-Out
Mar 30
Typical Ice-In
Nov 28

Estimated open water season: 243 days

EarliestLatest
Ice-Out2012-03-17 (2012)2009-04-01 (2009)
Ice-In2010-11-23 (2010)2009-12-05 (2009)

Most recent ice-out: 2012-03-17

Location

Loading map…

County Ranking

Ranked #4 of 24 lakes in Scott County

Cleaner Lakes Within 30 Miles

Cate'S Lake holds Grade B. One nearby lake has a higher grade.

See full comparison →

Nearby Lakes in Scott County

EPA Impairment Status

Cate'S Lake is officially listed as impaired under Clean Water Act §303(d) in the 2024 EPA reporting cycle (IR category 5).

Causes of impairment

Impaired biota (cause unknown)Mercury

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

Source: EPA ATTAINS assessment unit MN70-0026-00 · Official waterbody report · Matched by proximity (1.66 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: 2024-10-18

Monitoring stations: 1