Jones Slough Lake
Grant County, WisconsinView mapDirections
Wisconsin DNR publishes the water-quality measurements for Jones Slough Lake. Here is what has been measured.
- Eutrophic
- Public access
- Limited data
Jones Slough Lake in Grant County, Wisconsin has water-quality measurements published by Wisconsin DNR, shown here as reported. Water clarity: 4.9 ft visibility. Phosphorus: 31 µg/L.
Jones Slough Lake is a productive, nutrient-rich eutrophic lake in Grant County, Wisconsin. Overall water quality is declining over recent sampling years. Limited fish-species data available. Public access is available. Compared to the 2 other monitored lakes in Grant County, Jones Slough Lake ranks #1 for water quality.
Source: EPA Water Quality Portal sampling records, Wisconsin DNR Surface Water, last sampled 2023-10-30. Methodology: how these readings are compared.
Swimming conditions
Readings onlyLimited data
Based on clarity and algae readings from past sampling — there is no live water temperature and a current cyanobacteria reading for this lake. Check your state or county health department before you swim.
Nutrient and algae readings are not a swimming clearance. Check local advisories before you swim.
Whether Jones Slough Lake is safe to swim in today is a call for the Wisconsin Department of Natural Resources and the county health department, who post current advisories. LakeQuality does not issue swimming clearances.
Water quality measurements for Jones Slough Lake
These are the measurements Wisconsin DNR publishes for Jones Slough Lake, shown as reported. The condition class beside each reading is the EPA National Lakes Assessment class for this lake’s ecoregion.
Murky, only visible to about 4.9 ft. Phosphorus 31 µg/L. TSI 54.
| Measure | Reading | Where it sits |
|---|---|---|
| Water clarity (Secchi depth) | 4.9ft | Measured, not scored How deep a black-and-white disk stays visible from the surface. Higher is clearer. |
| Total phosphorus | 31µg/L | Fair GoodFairPoor |
| Chlorophyll-a (algae) | No reading The green pigment in algae — a direct measure of how much algae is in the water. | |
| Trophic state (TSI)Carlson's 0–100 index of how much algae a lake can support, from clarity, phosphorus and chlorophyll-a. | 54 | Eutrophic OligotrophicMesotrophicEutrophicHypereutrophic |
High nutrients, frequent algae, reduced clarity
Ask about Jones Slough Lake
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Fishing Jones Slough Lake
Water quality readings over time
2 seasons of samples on record (2023–2024). Calling a direction takes at least 4 years of the same measurement.
Water clarity
Worsening2 years
Phosphorus
Worsening+35.6 µg/L/yr2 years
Regulated Pollution Sources Nearby
1 EPA-permitted facility operate within about 5 miles of Jones Slough Lake under Clean Water Act (NPDES) discharge permits. 1 facility has a reported Clean Water Act violation in the past three years.
- Blue River Wastewater Treatment FacilityBlue River · 1.4 mi away · NPDES WI0023418Recent violation
Facilities permitted to discharge under the Clean Water Act within ~5 miles; proximity does not by itself mean a facility affects this lake. Source: EPA ECHO (ICIS-NPDES), as of 2026-07.
Nearby Lakes in Grant County
Frequently asked questions about Jones Slough Lake
Where is Jones Slough Lake?
- Jones Slough Lake is a lake in Grant County, Wisconsin. Its water-quality measurements are published by Wisconsin DNR and shown on this page as reported.
What is the water quality of Jones Slough Lake?
- Jones Slough Lake in Grant County, Wisconsin has water-quality measurements published by Wisconsin DNR, shown here as reported. Water clarity: 4.9 ft visibility. Phosphorus: 31 µg/L.
Is Jones Slough Lake safe to swim in?
- Nutrient and algae readings are not a swimming clearance. Check local advisories before you swim.
Can I fish at Jones Slough Lake?
- Public access to Jones Slough Lake is listed as yes on the lake record. Seasons, size and bag limits, and whether you need a license are set by Wisconsin's fish and wildlife agency, so check its current regulations before you go.
Explore Jones Slough Lake across LakeQuality
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Where this data comes from
12 measurements from 1 monitoring station, 2023. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- Wisconsin Department of Natural Resources
WIDNR_WQX12 samples · 2023
Analytical methods
- Phosphorus by Colorimetry
Monitoring station identifiers (1)
EPA condition classes from the National Lakes Assessment (EPA 841-R-24-006, Table 6-3), applied by ecoregion. See where the data comes from and data sources.
Other records on this page
Regulated discharger data from EPA ECHO (ICIS-NPDES)
Fish and recreation data from Wisconsin DNR Lakes