Lake Leelanau; North Basin
Leelanau County, WisconsinLimited DataOligotrophic
Lake Leelanau; North Basin is a cold, clear oligotrophic lake in Leelanau County, MI. Water quality is graded A based on 1 sampling years through 2021. Compared to the 20 other monitored lakes in Leelanau County, Lake Leelanau; North Basin ranks #4 for water quality.
Source: EPA Water Quality Portal sampling records, local state DNR records, last sampled 2021-08-10. Grade methodology: LakeGrade methodology.
Swimming Safety
Excellent for swimming, crystal clear water with minimal algae
Water Quality Grade: A, Excellent
Crystal clear, you can see 18 ft down. Trophic State Index: 35.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 18 ft | A |
| Phosphorus | No data | |
| Chlorophyll-a (Algae) | No data | |
| Trophic State Index (TSI) | 35 | Oligotrophic |
Low nutrients, clear water, excellent for swimming
Location
County Ranking
Ranked #4 of 21 lakes in Leelanau County
Nearby Lakes in Leelanau County
More Wisconsin Lake Rankings
Other Grade A Lakes in Wisconsin
Mecosta County · Clarity: 12.8 ft
Benzie County · Clarity: 13.5 ft
Clare County · Clarity: 15 ft
Kalkaska County · Clarity: 16 ft
Gogebic County · Clarity: 18 ft
Iron County · Clarity: 16 ft
Oligotrophic Lakes in Wisconsin
EPA Impairment Status
Lake Leelanau; North Basin 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 MI040601040103-04 · Official waterbody report · Matched by proximity (2.15 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: 2021-08-10
Monitoring stations: 1