Upper Long Lake
Oakland County, WisconsinLimited DataMesotrophic
Upper Long Lake is a mesotrophic lake in Oakland County, MI. Water quality is graded C based on 1 sampling years through 2022. Compared to the 44 other monitored lakes in Oakland County, Upper Long Lake ranks #40 for water quality.
Source: EPA Water Quality Portal sampling records, local state DNR records, last sampled 2022-09-18. Grade methodology: LakeGrade methodology.
Swimming Safety
Generally safe for swimming, moderate water quality
Water Quality Grade: C, Fair
Moderate clarity, visible to about 8 ft. Trophic State Index: 47.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 8 ft | C |
| Phosphorus | No data | |
| Chlorophyll-a (Algae) | No data | |
| Trophic State Index (TSI) | 47 | Mesotrophic |
Moderate nutrients, good water quality
Location
County Ranking
Ranked #40 of 45 lakes in Oakland County
Cleaner Lakes Within 30 Miles
Upper Long Lake holds Grade C. One nearby lake has a higher grade.
See full comparison →Nearby Lakes in Oakland County
More Wisconsin Lake Rankings
Other Grade C Lakes in Wisconsin
Cass County · Clarity: 7 ft
Leelanau County · Clarity: 9.5 ft
Iosco County · Clarity: 5.5 ft
Muskegon County · Clarity: 6.8 ft
Gladwin County · Clarity: 9 ft
Montmorency County · Clarity: 9 ft
Mesotrophic Lakes in Wisconsin
EPA Impairment Status
Upper Long Lake 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 (0.55 km)
Data Sources
Water quality data from the EPA Water Quality Portal
Impairment status from EPA ATTAINS 303(d) database
Grading methodology based on Metropolitan Council standards
Most recent sample: 2022-09-18
Monitoring stations: 1