Upper Long Lake Northwest Basin; Bloomfield Township is a mesotrophic lake in Oakland County, Michigan. Water quality is graded B based on 2 sampling years through 2023. Water clarity is improving over recent sampling years. Compared to the 44 other monitored lakes in Oakland County, Upper Long Lake Northwest Basin; Bloomfield Township ranks #24 for water quality.
Source: EPA Water Quality Portal sampling records, Michigan DNR, last sampled 2023-09-25. Grade methodology: LakeGrade methodology.
Watch Upper Long Lake Northwest Basin; Bloomfield Township water quality
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Swimming Safety
Good for swimming, clear water with low algae levels
Water Quality Grade: B, Good
Moderate clarity, visible to about 8 ft. Chlorophyll-a: 2 µg/L. Trophic State Index: 42.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 8 ft | C |
| Phosphorus | No data | |
| Chlorophyll-a (Algae) | 2 µg/L | A |
| Trophic State Index (TSI) | 42 | Mesotrophic |
Moderate nutrients, good water quality
Where to stay near Upper Long Lake Northwest Basin; Bloomfield Township
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Fishing Upper Long Lake Northwest Basin; Bloomfield Township
Invasive & Introduced Species
Red chips are ecologically harmful invasive species. Gray chips are stocked or introduced fish that aren't a current ecological concern.
Source: USGS Nonindigenous Aquatic Species (NAS) Database. Hover a chip to see scientific name, ecological context, status, and first-observed year.
Water Quality Trend: → Stable
Based on 3 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Water Clarity | ↑ Improving | +4.64 m/yr | 3 |
| Chlorophyll-a | ↓ Declining | +0.45 µg/L/yr | 2 |
Water Temperature
Upper Long Lake Northwest Basin; Bloomfield Township averages about 74°F at the surface in summer, usually warmest in Aug (about 78°F) and coldest in May (about 62°F). These are typical values by month — not a live reading.
Typical surface water temperature by month, from 181 field readings (2019–2023) via the EPA Water Quality Portal. See the full Upper Long Lake Northwest Basin; Bloomfield Township water temperature breakdown →
Location
County Ranking
Ranked #24 of 45 lakes in Oakland County
Nearby Lakes in Oakland County
Explore Upper Long Lake Northwest Basin; Bloomfield Township across LakeGrade
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Species activity outlook by water temperature and season
Where to stay at Michigan's top lakes, each with its grade
Moderate nutrients, good water quality
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More Michigan Lake Rankings
Other Grade B Lakes in Michigan
Livingston County · Clarity: 12 ft
Livingston County · Clarity: 12 ft
Genesee County · Clarity: 12 ft
Genesee County · Clarity: 12 ft
Genesee County · Clarity: 10 ft
Genesee County · Clarity: 10 ft
Mesotrophic Lakes in Michigan
More records, surveys & data sources
EPA Impairment Status
Upper Long Lake Northwest Basin; Bloomfield Township is officially listed as impaired under Clean Water Act §303(d) in the 2024 EPA reporting cycle (IR category 5).
Causes of impairment
A Total Maximum Daily Load (TMDL) plan has been approved.
Source: EPA ATTAINS assessment unit MI040900040401-12 · Official waterbody report · Matched by proximity (0.29 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: 2023-09-25
Monitoring stations: 1