Washington County, Minnesota · Water Quality Report Card
Pool
Pool in Washington County, Minnesota has a water quality grade of B (Good). Water clarity: 5.9 ft visibility. Phosphorus: 31.1 µg/L. Maximum depth: 78 ft. Surface area: 8393.04 acres.
- Clarity
- 5.9 ft
- Max depth
- 78 ft
- Area
- 8,393 acres
- Type
- Eutrophic
- Trend
- → Stable
- Public access
- No
Pool is a 8,393-acre productive, nutrient-rich eutrophic lake in Washington County, Minnesota with a maximum depth of 78 feet. Water quality is graded B based on 1 sampling years through 2024. Water clarity is improving over recent sampling years. The lake supports 36 documented fish species including bigmouth buffalo, black bullhead, and black crappie. No public access — the lake is private or restricted. Compared to the 74 other monitored lakes in Washington County, Pool ranks #22 for water quality.
Source: EPA Water Quality Portal sampling records, Minnesota DNR LakeFinder, last sampled 2024-10-29. Grade methodology: LakeGrade methodology.
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Swimming Safety
Good for swimming, clear water with low algae levels
Water Quality Grade: B (Good)
Murky, only visible to about 5.9 ft. Phosphorus level: 31.1 µg/L. Trophic State Index: 53.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 5.9 ft | |
| Phosphorus | 31.1 µg/L | Good |
| Chlorophyll-a (Algae) | No data | |
| Trophic State Index (TSI) | 53 | Eutrophic |
High nutrients, frequent algae, reduced clarity
Lake Details
| Characteristic | Value |
|---|---|
| Maximum Depth | 78 ft |
| Surface Area | 8,393 acres |
| Shoreline Length | 124.5 mi |
| Public Access | No |
Where to stay near Pool
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Fish Species
Click a species to see every graded lake where it is documented.
Fishing Pool
Invasive & Introduced Species
Red chips are ecologically harmful invasive species. Gray chips are stocked or introduced fish that aren't a current ecological concern.
Water Quality Trend: → Stable
Based on 5 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Water Clarity | ↑ Improving | +0.084 m/yr | 5 |
| Phosphorus | ↓ Declining | +7.2 µg/L/yr | 5 |
Location
County Ranking
Ranked #22 of 75 lakes in Washington County
Nearby Lakes in Washington County
Explore Pool across LakeGrade
Fish species and top-graded lakes across Minnesota
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Species activity outlook by water temperature and season
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Lakes in the St. Croix Watershed, ranked by water quality
High nutrients, frequent algae, reduced clarity
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Eutrophic Lakes in Minnesota
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More records, surveys & data sources
Where this data comes from
71 measurements from 1 monitoring station, 2020–2024. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- National Park Service Water Resources Division
11NPSWRD_WQX71 samples · 2020–2024
Analytical methods
- Secchi Disk
- Alkaline Persulfate Digestion for Total N and P in Water
Monitoring station identifiers (1)
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
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: 2024-10-29
Monitoring stations: 1