Jellums Lake
Washington County, MinnesotaView mapDirections
Minnesota PCA publishes the water-quality measurements for Jellums Lake. Here is what has been measured.
- Eutrophic
- 2 aquatic invasives
- Public access
- Limited data
Jellums Lake in Washington County, Minnesota has water-quality measurements published by Minnesota PCA, shown here as reported. Water clarity: 6 ft visibility. Phosphorus: 27 µg/L. Chlorophyll-a (algae): 8.2 µg/L.
Jellums Lake is a productive, nutrient-rich eutrophic lake in Washington County, Minnesota. Limited fish-species data available. Public access is available with 1 public boat landing. Compared to the 74 other monitored lakes in Washington County, Jellums Lake ranks #42 for water quality.
Source: EPA Water Quality Portal sampling records, Minnesota DNR LakeFinder, last sampled 2024-10-14. Methodology: how these readings are compared.
What Jellums Lake is good for
From access and monitoring records, not editorial picks.
- Boat launch1 documented ramp
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 Jellums Lake is safe to swim in today is a call for the Minnesota Pollution Control Agency and the Minnesota DNR and the county health department, who post current advisories. LakeQuality does not issue swimming clearances.
Water quality measurements for Jellums Lake
These are the measurements Minnesota PCA publishes for Jellums 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 6 ft. Phosphorus 27 µg/L. Chlorophyll-a 8.2 µg/L. TSI 51.
| Measure | Reading | Where it sits |
|---|---|---|
| Water clarity (Secchi depth) | 6ft | Measured, not scored How deep a black-and-white disk stays visible from the surface. Higher is clearer. |
| Total phosphorus | 27µg/L | Fair GoodFairPoor |
| Chlorophyll-a (algae) | 8.2µg/L | Fair GoodFairPoor |
| Trophic state (TSI)Carlson's 0–100 index of how much algae a lake can support, from clarity, phosphorus and chlorophyll-a. | 51 | Eutrophic OligotrophicMesotrophicEutrophicHypereutrophic |
High nutrients, frequent algae, reduced clarity
Ask about Jellums Lake
Answers come straight from the public measurements and survey records on this page.
Water Temperature
Jellums Lake typically sits around 52°F at the surface in October. Summer average is about 70°F. Usually warmest in Jul (about 72°F) and coldest in Apr (about 47°F). These are typical values by month — not a live reading.
Column height runs from this lake’s coldest month (47°F) to its warmest (72°F).
Typical surface water temperature by month, from 195 field readings (2010–2024) via the EPA Water Quality Portal. See the full Jellums Lake water temperature breakdown →
Recreation & Access
- Big Marine Lake (North)Public
Named access points in the USGS National Boat Ramps inventory, within about 3 miles. More lakes with boat ramps
Stays via Stay22
Stays near Jellums Lake
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Top-rated places to stay near Jellums Lake
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Fishing Jellums Lake
Invasive & Introduced Species
Red chips are ecologically harmful invasive species. Gray chips are stocked or introduced fish that aren't a current ecological concern.
Nearby Lakes in Washington County
Frequently asked questions about Jellums Lake
Where is Jellums Lake?
- Jellums Lake is a lake in Washington County, Minnesota. Its water-quality measurements are published by Minnesota PCA and shown on this page as reported.
What is the water quality of Jellums Lake?
- Jellums Lake in Washington County, Minnesota has water-quality measurements published by Minnesota PCA, shown here as reported. Water clarity: 6 ft visibility. Phosphorus: 27 µg/L. Chlorophyll-a (algae): 8.2 µg/L.
Is Jellums Lake safe to swim in?
- Nutrient and algae readings are not a swimming clearance. Check local advisories before you swim.
What is the water temperature of Jellums Lake?
- Jellums Lake typically sits around 52°F at the surface in October, from 195 EPA Water Quality Portal field readings (2010–2024). That is a typical value for the month, not a live reading.
Are there boat ramps on Jellums Lake?
- Jellums Lake has 1 documented boat landing in the USGS National Boat Ramps inventory. Named access points include Big Marine Lake (North). Public access is listed as yes.
Can I fish at Jellums Lake?
- Jellums Lake has 1 documented boat landing in the USGS National Boat Ramps inventory. Seasons, size and bag limits, and whether you need a license are set by Minnesota's fish and wildlife agency, so check its current regulations before you go.
Explore Jellums Lake across LakeQuality
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Species activity outlook by water temperature and season
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Where this data comes from
28 measurements from 1 monitoring station, 2024. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- Minnesota Pollution Control Agency - Ambient Surface Water
MNPCA28 samples · 2024
Analytical methods
- Field measurement/observation, generic method
- Phosphorus by Colorimetry
- Analysis of Chlorophyll in Periphyton and Plankton
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
Named boat-access points from the USGS National Boat Ramps inventory