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.
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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.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 5.2 ft | D |
| Phosphorus | 570 µg/L | F |
| Chlorophyll-a (Algae) | No data | |
| Trophic State Index (TSI) | 75 | Hypereutrophic |
Very high nutrients, dense algae, poor clarity
Lake Details
| Characteristic | Value |
|---|---|
| Surface Area | 171 acres |
| Public Access | No |
Fish Species
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).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Water Clarity | ↓ Declining | -0.225 m/yr | 3 |
| Phosphorus | ↑ Improving | -11.97 µg/L/yr | 4 |
Location
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.
- ACedar LakeWright County · mi · Two grade letters higher (D → A)
- BPleasant LakeWright County · mi · Two grade letters higher (D → B)
- CGranite LakeWright County · mi · Higher grade (D → C)
- CSomers LakeWright County · mi · Higher grade (D → C)
- CRamsey LakeWright County · mi · Higher grade (D → C)
Nearby Lakes in Wright County
More Minnesota Lake Rankings
State Parks Near Swartout Lake
Other Grade D 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
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