Juno Lake Central Basin; Mason Township is a productive, nutrient-rich eutrophic lake in Cass County, Michigan. Water quality is graded C based on 2 sampling years through 2023. Overall water quality is improving over recent sampling years. Compared to the 22 other monitored lakes in Cass County, Juno Lake Central Basin; Mason Township ranks #17 for water quality.
Source: EPA Water Quality Portal sampling records, Michigan DNR, last sampled 2023-09-20. Grade methodology: LakeGrade methodology.
Watch Juno Lake Central Basin; Mason Township water quality
Subscribe for LakeQuality updates by email. No spam, unsubscribe anytime.
Swimming Safety
Generally safe for swimming, moderate water quality
Water Quality Grade: C, Fair
Moderate clarity, visible to about 7 ft. Chlorophyll-a: 11.5 µg/L. Trophic State Index: 52.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 7 ft | C |
| Phosphorus | No data | |
| Chlorophyll-a (Algae) | 11.5 µg/L | C |
| Trophic State Index (TSI) | 52 | Eutrophic |
High nutrients, frequent algae, reduced clarity
Where to stay near Juno Lake Central Basin; Mason Township
Compare lakeside cabins, hotels, and vacation rentals near Juno Lake Central Basin; Mason Township in Cass County, Michigan — live availability and prices for your trip. Switch the map to Satellite to see the lake and how close each stay is to the water.
Top-rated places to stay near Juno Lake Central Basin; Mason Township
Availability and prices from Stay22 partners (Booking.com, Vrbo, Expedia). We may earn a commission from bookings, at no extra cost to you.
Planning a trip to Juno Lake Central Basin; Mason Township?
Get lake water-quality report cards plus the best cabin & lodging deals near Juno Lake Central Basin; Mason Township — straight to your inbox. No spam, unsubscribe anytime.
Planning a whole trip? See where to stay at Michigan’s top lakes →
Fishing Juno Lake Central Basin; Mason Township
Water Quality Trend: ↑ Improving
Based on 2 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Water Clarity | ↑ Improving | +3.38 m/yr | 2 |
Water Temperature
Juno Lake Central Basin; Mason Township averages about 66°F at the surface in summer, usually warmest in Aug (about 69°F) and coldest in May (about 58°F). These are typical values by month — not a live reading.
Typical surface water temperature by month, from 485 field readings (2012–2022) via the EPA Water Quality Portal. See the full Juno Lake Central Basin; Mason Township water temperature breakdown →
Location
County Ranking
Ranked #17 of 23 lakes in Cass County
Cleaner Lakes Within 30 Miles
Juno Lake Central Basin; Mason Township holds Grade C. 2 nearby lakes hold higher grades.
- BChristiana Lake Central Basin; Ontwa TownshipCass County · 0.6 mi · Higher grade (C → B)
- BEagle Lake West Central Basin; Ontwa TownshipCass County · 2.2 mi · Higher grade (C → B)
Nearby Lakes in Cass County
Explore Juno Lake Central Basin; Mason Township across LakeGrade
Fish species and top-graded lakes across Michigan
Fish species and best lakes in Cass County
Species activity outlook by water temperature and season
Where to stay at Michigan's top lakes, each with its grade
High nutrients, frequent algae, reduced clarity
Michigan's cleanest and most-polluted lakes, ranked
More Michigan Lake Rankings
Other Grade C Lakes in Michigan
Van Buren County · Clarity: 8 ft
Kalamazoo County · Clarity: 9 ft
St. Joseph County · Clarity: 9.5 ft
Kalamazoo County · Clarity: 8 ft
St. Joseph County · Clarity: 6 ft
Van Buren County · Clarity: 8.3 ft
Eutrophic Lakes in Michigan
More records, surveys & data sources
EPA Impairment Status
Juno Lake Central Basin; Mason Township is officially listed as impaired under Clean Water Act §303(d) in the 2024 EPA reporting cycle (IR category 4A).
Causes of impairment
A Total Maximum Daily Load (TMDL) plan has been approved.
Source: EPA ATTAINS assessment unit MI040500011403-03 · Official waterbody report · Matched by proximity (0.27 km)
Lake Size & Watershed
Size, shoreline, and watershed area from HydroLAKES (HydroSHEDS). Mean depth is a modeled estimate.
Data Sources
Water quality data from the EPA Water Quality Portal
Impairment status from EPA ATTAINS 303(d) database
Lake size & watershed from HydroLAKES (HydroSHEDS)
Grading methodology based on Metropolitan Council standards
Most recent sample: 2023-09-20
Monitoring stations: 1