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F

Fountain Lake

Wright County, MinnesotaHypereutrophic

Fountain Lake grades an F: every scored parameter (clarity and phosphorus) rates poorly, placing it among the most stressed lakes monitored in Minnesota. clarity and phosphorus rate similarly, so there is no obvious single lever to pull on watershed management.

A TSI above 70 puts Fountain Lake in hypereutrophic territory: visible blooms are common, and clarity rarely climbs even in early summer. A maximum depth of just 10 ft means sediment-bound phosphorus releases back into the water column whenever wind stirs the bottom — a classic shallow-lake dynamic. At 435 acres, Fountain Lake fits the Minnesota median for monitored lakes, with 5.4 miles of shoreline. Within the 64 graded lakes of Wright County, Fountain Lake sits at rank 53, near the bottom of the county list.

No invasive species are currently listed at Fountain Lake — the lake remains off the Minnesota infested-waters roster. The fishery is panfish-dominated — bluegill, crappie, and sunfish among the 5 species documented for the lake. A documented public access point at Fountain Lake makes the lake usable for shore fishing, paddle craft, and trailered boats. The lake has a partial ice record — 6 observed ice-outs, centered near Apr 15. Monitoring depth is thin here: the LakeGrade rubric is applied to a small number of sample years, and the grade will be revised as more data accumulates.

Source: EPA Water Quality Portal sampling records, Minnesota DNR LakeFinder, last sampled 2024-10-17. Grade methodology: LakeGrade methodology.

Reviewed by LakeQuality Editorial Team · Updated

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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 1 ft of visibility. Phosphorus level: 135 µg/L. Trophic State Index: 76.

MetricValueGrade
Water Clarity (Secchi Depth)1 ftF
Phosphorus135 µg/LF
Chlorophyll-a (Algae)No data
Trophic State Index (TSI)76Hypereutrophic

Very high nutrients, dense algae, poor clarity

Lake Details

CharacteristicValue
Maximum Depth10 ft
Average Depth5 ft
Surface Area434.65 acres
Shoreline Length5.4 mi
Littoral Zone99%
Public AccessYes

Fish Species

black bullhead,brown bullhead,common carp,green sunfish,white sucker

Click a species to see all Minnesota and Wisconsin lakes where it is found.

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

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

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

Water Quality Trend: Declining

Based on 5 years of monitoring data (2020-2025).

MetricTrendChange/YearYears
Water Clarity Declining-0.03 m/yr5
See year-by-year chart →

Ice Season

Historical ice data from Minnesota DNR (10 observations).

Typical Ice-Out
Apr 15
Typical Ice-In
Nov 19

Estimated open water season: 218 days

EarliestLatest
Ice-Out2016-03-11 (2016)2015-04-29 (2015)
Ice-In2014-11-11 (2014)2007-11-24 (2007)

Most recent ice-out: 2022-04-11

Location

Loading map…

County Ranking

Ranked #53 of 64 lakes in Wright County

Cleaner Lakes Within 30 Miles

Fountain Lake holds Grade F. 4 nearby lakes hold higher grades.

See full comparison →

Nearby Lakes in Wright County

State Parks Near Fountain Lake

Hypereutrophic Lakes in Minnesota

DNR Fisheries Survey Summary

1 survey on file from MN DNR Fisheries. Most recent: 2017-09-11 (Targeted Survey).

Top Species by Catch Rate

SpeciesAvg CPUEAvg Weight
Black Bullhead71.500.09 lb
Green Sunfish39.670.06 lb
Common Carp1.674.56 lb
Brown Bullhead0.671.09 lb
White Sucker0.171.46 lb

CPUE = catch per unit effort, averaged across surveys (excludes juvenile shoreline seining). Higher CPUE = more abundant in standardized sampling.

Length Distributions

Number of fish caught at each inch class in the most recent survey that recorded lengths. Red dashed line marks an approximate trophy threshold for that species.

Black Bullhead

428 fish · 412 in · 2017-09-11
174870456789101112

Green Sunfish

238 fish · 37 in · 2017-09-11
11558034567

Common Carp

10 fish · 1829 in · 2017-09-11
320181920212223242526272829

Brown Bullhead

4 fish · 1015 in · 2017-09-11
10101112131415

From the 2017-09-11 survey

Fountain is a 430-acre lake located southeast of the City of Montrose in Wright County. It is a relatively shallow and eutrophic lake with a maximum depth of 10 feet. Fountain Lake has relatively large amounts of floating leaf and emergent plants such as yellow water lily, cattail and bulrush. However, little…

Source: MN DNR LakeFinder Fisheries Lake Survey

DNR Reports & Resources

Minnesota DNR LakeFinder publishes lake survey, fish stocking, water access, and aquatic plant data for Fountain Lake. 3 reports on file.

EPA Impairment Status

Fountain 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 MN86-0086-00 · 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: 2024-10-17

Monitoring stations: 2