Cook County, Minnesota · Water Quality Report Card
Swamp Lake Inlet
Swamp Lake Inlet in Cook County, Minnesota is not rated for water quality — its monitoring record does not meet the evidence bar.
- Mean depth
- ~11 ft est.
- Trend
- ↓ Declining
Swamp Lake Inlet is a lake in Cook County, Minnesota with an estimated average depth of about 11 feet. Overall water quality is declining over recent sampling years.
Source: EPA Water Quality Portal sampling records, Minnesota DNR LakeFinder, last sampled 2024-09-10. Grade methodology: LakeGrade methodology.
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Swimming Safety
Not rated for swimming — there is not enough monitoring data to judge this lake
Water Quality Grade: Not rated
No clarity data.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | No data | |
| Phosphorus | No data | |
| Chlorophyll-a (Algae) | No data |
Lake Details
| Characteristic | Value |
|---|---|
| Average Depth | ~11 ft est. |
Depth marked “est.” is a modeled estimate from HydroLAKES, not a measured survey. Minnesota has not published bathymetry for Swamp Lake Inlet.
Where to stay near Swamp Lake Inlet
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Fishing Swamp Lake Inlet
Water Quality Trend: ↓ Declining
Based on 3 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Water Clarity | ↓ Declining | -1.375 m/yr | 2 |
| Phosphorus | ↓ Declining | +2.03 µg/L/yr | 3 |
| Chlorophyll-a | → Stable | +0.1 µg/L/yr | 3 |
Location
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Lake Size & Watershed
Size, shoreline, and watershed area from HydroLAKES (HydroSHEDS). Mean depth here is modelled, not surveyed — HydroLAKES v1.0 estimates lake depth from surrounding terrain rather than from soundings. Treat it as an approximation, and prefer a state bathymetric survey where one exists.
Where this data comes from
11 measurements from 2 monitoring stations, 2020–2024. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- Grand Portage Reservation
GPC5_WQX8 samples · 2022–2024 - 21GPBCH - Grand Portage Beaches (Tribal)
21GPBCH3 samples · 2020
Analytical methods
- Turbidity by Nephelometry
Monitoring station identifiers (2)
Grade thresholds come from the U.S. EPA National Lakes Assessment 2022 Technical Support Document (EPA 841-R-24-006, Table 6-3), applied by ecoregion. See how grades are calculated.
Data Sources
Water quality data from the EPA Water Quality Portal
Lake size & watershed from HydroLAKES (HydroSHEDS)
Grade thresholds from the EPA National Lakes Assessment (EPA 841-R-24-006, Table 6-3), applied by ecoregion
Lake details from Minnesota DNR LakeFinder
Most recent sample: 2024-09-10
Monitoring stations: 2