Juno Lake
Cass County, Michigan241 acresView mapDirections
EGLE publishes the water-quality measurements for Juno Lake. Here is what has been measured.
- Eutrophic
- Impaired · Mercury
Juno Lake in Cass County, Michigan has water-quality measurements published by EGLE, shown here as reported. Water clarity: 7.5 ft visibility. Phosphorus: 22 µg/L. Chlorophyll-a (algae): 8.2 µg/L. Surface area: 240.8 acres.
Juno Lake is a 241-acre productive, nutrient-rich eutrophic lake in Cass County, Michigan. Water clarity is improving over recent sampling years. Compared to the 9 other monitored lakes in Cass County, Juno Lake ranks #7 for water quality.
Source: EPA Water Quality Portal sampling records, EGLE, last sampled 2023-09-20. Methodology: how these readings are compared.
Swimming conditions
Readings onlyModerate algae
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. Juno Lake is listed impaired under Clean Water Act §303(d) (IR 4A) for mercury. Check local advisories before you swim.
Whether Juno Lake is safe to swim in today is a call for the Michigan Department of Environment, Great Lakes, and Energy (EGLE) and the county health department, who post current advisories. LakeQuality does not issue swimming clearances.
Water quality measurements for Juno Lake
These are the measurements EGLE publishes for Juno Lake, shown as reported. The condition class beside each reading is the EPA National Lakes Assessment class for this lake’s ecoregion.
Moderate clarity, visible to about 7.5 ft. Phosphorus 22 µg/L. Chlorophyll-a 8.2 µg/L. TSI 49.
| Measure | Reading | Where it sits |
|---|---|---|
| Water clarity (Secchi depth) | 7.5ft | Measured, not scored How deep a black-and-white disk stays visible from the surface. Higher is clearer. |
| Total phosphorus | 22µg/L | Good 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. | 49 | Eutrophic OligotrophicMesotrophicEutrophicHypereutrophic |
High nutrients, frequent algae, reduced clarity
Ask about Juno Lake
Answers come straight from the public measurements and survey records on this page.
Water Temperature
Juno Lake typically sits around 67°F at the surface in September. Summer average is about 66°F. Usually warmest in Aug (about 69°F) and coldest in May (about 58°F). These are typical values by month — not a live reading.
Column height runs from this lake’s coldest month (58°F) to its warmest (69°F).
Typical surface water temperature by month, from 485 field readings (2012–2022) via the EPA Water Quality Portal. See the full Juno Lake water temperature breakdown →
Lake Details
Surface area
241 acres
No bathymetric survey has been published for Juno Lake, so its depth is not documented here.
Stays via Stay22
Stays near Juno Lake
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Fishing Juno Lake
Water Quality Trend: Stable
Based on 6 years of monitoring (2016–2023).
Water clarity
Improving6 years
Phosphorus
Stable+0.29 µg/L/yr5 years
Chlorophyll-a
Worsening+0.9 µg/L/yr4 years
EPA Impairment Status
Juno Lake is officially listed as impaired under Clean Water Act §303(d) in the 2024 EPA reporting cycle (IR category 4A).
Causes of impairment
Designated uses not supporting: Fish consumption.
A Total Maximum Daily Load (TMDL) plan has been approved.
Source: EPA ATTAINS assessment unit MI040500011403-03 · Official waterbody report
Nearby Lakes in Cass County
Frequently asked questions about Juno Lake
Where is Juno Lake?
- Juno Lake is a lake in Cass County, Michigan. Its water-quality measurements are published by EGLE and shown on this page as reported.
What is the water quality of Juno Lake?
- Juno Lake in Cass County, Michigan has water-quality measurements published by EGLE, shown here as reported. Water clarity: 7.5 ft visibility. Phosphorus: 22 µg/L. Chlorophyll-a (algae): 8.2 µg/L. Surface area: 240.8 acres.
Is Juno Lake safe to swim in?
- Nutrient and algae readings are not a swimming clearance. Juno Lake is listed impaired under Clean Water Act §303(d) (IR 4A) for mercury. Check local advisories before you swim.
What is the water temperature of Juno Lake?
- Juno Lake typically sits around 67°F at the surface in September, from 485 EPA Water Quality Portal field readings (2012–2022). That is a typical value for the month, not a live reading.
Explore Juno Lake across LakeQuality
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Where this data comes from
99 measurements from 1 monitoring station, 2016–2023. Retrieved from the EPA Water Quality Portal on 2026-08-26.
Collected and reported by
- Michigan EGLE - MiCorps
21MICH_MICORPS99 samples · 2016–2023
Analytical methods
- Phosphorus by Colorimetry
- 445.0 ~ EPA; Chlorophyll and Pheophytin in Algae by Fluorescence
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
Impairment status from EPA ATTAINS 303(d) database