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D

Swartout Lake

Wright County, MinnesotaHypereutrophic

Swartout Lake earns a D — measurements through 2024 show persistent nutrient pressure that limits clarity through the summer. The two scored sub-grades — clarity and phosphorus — track close together, so neither one is dragging the average down.

A TSI above 70 puts Swartout 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. At 171 acres, Swartout Lake fits the Minnesota median for monitored lakes, with partial shoreline records. Swartout Lake ranks 50 of 64 in Wright County — at the lower end of the locally monitored distribution.

No invasive species are currently listed at Swartout Lake — the lake remains off the Minnesota infested-waters roster. The lake's fish records list 3 species — a varied community without one dominant gamefish. No formal public access is documented at Swartout 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 2024-07-30. Grade methodology: LakeGrade methodology.

Reviewed by LakeQuality Editorial Team · Updated

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Swimming Safety

Swimming not recommended, poor water quality with high algae risk

Water Quality Grade: D, Poor

Murky, only visible to about 5.2 ft. Phosphorus level: 570 µg/L. Trophic State Index: 75.

MetricValueGrade
Water Clarity (Secchi Depth)5.2 ftD
Phosphorus570 µg/LF
Chlorophyll-a (Algae)No data
Trophic State Index (TSI)75Hypereutrophic

Very high nutrients, dense algae, poor clarity

Lake Details

CharacteristicValue
Surface Area171 acres
Public AccessNo

Fish Species

black bullhead,common carp,northern pike

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

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

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

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

Water Quality Trend: Stable

Based on 4 years of monitoring data (2020-2025).

MetricTrendChange/YearYears
Water Clarity Declining-0.225 m/yr3
Phosphorus Improving-11.97 µg/L/yr4
See year-by-year chart →

Location

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County Ranking

Ranked #50 of 64 lakes in Wright County

Cleaner Lakes Within 30 Miles

Swartout Lake holds Grade D. 5 nearby lakes hold higher grades.

See full comparison →

Nearby Lakes in Wright County

Hypereutrophic Lakes in Minnesota

Reservoir Info (USACE NID)

Swartout Lake is a man-made reservoir impounded by the Swart Watts Lake (completed 1941), built primarily for recreation on the Clearwater River-TR; gravity-type dam, 8 ft tall and 30 ft long.

Surface area
171 ac
Normal storage
1,026 ac-ft
Max storage
1,539 ac-ft
Drainage area
3.4 sq mi
Hazard class
Low
Owner
MNDNR

Source: USACE National Inventory of Dams, NID ID MN00532 · Operator website

EPA Impairment Status

Swartout 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 MN86-0208-00 · 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

Most recent sample: 2024-07-30

Monitoring stations: 1