Shag Lake Northeast Basin
Marquette County, WisconsinLimited DataOligotrophic
Shag Lake Northeast Basin is a cold, clear oligotrophic lake in Marquette County, MI. Water quality is graded B based on 1 sampling years through 2023. The lake supports 7 documented fish species including Blacknose shiner, Golden shiner, and Iowa darter. Compared to the 9 other monitored lakes in Marquette County, Shag Lake Northeast Basin ranks #6 for water quality.
Source: EPA Water Quality Portal sampling records, local state DNR records, last sampled 2023-09-23. Grade methodology: LakeGrade methodology.
Swimming Safety
Good for swimming, clear water with low algae levels
Water Quality Grade: B, Good
Good clarity, visible to about 14.3 ft. Trophic State Index: 39.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 14.3 ft | B |
| Phosphorus | No data | |
| Chlorophyll-a (Algae) | No data | |
| Trophic State Index (TSI) | 39 | Oligotrophic |
Low nutrients, clear water, excellent for swimming
Fish Species
Click a species to see all Wisconsin and Minnesota lakes where it is found.
→ Best fishing times for Shag Lake Northeast Basin (14-day solunar calendar)
→ Is it safe to eat fish from Shag Lake Northeast Basin? (mercury & PFAS guide)
→ Shag Lake Northeast Basin fishing regulations (limits, seasons, special rules)
Location
County Ranking
Ranked #6 of 10 lakes in Marquette County
Nearby Lakes in Marquette County
More Wisconsin Lake Rankings
Other Grade B Lakes in Wisconsin
Lapeer County · Clarity: 9.5 ft
Livingston County · Clarity: 13 ft
Manistee County · Clarity: 11 ft
Lake County · Clarity: 14 ft
Cass County · Clarity: 10.5 ft
Genesee County · Clarity: 10 ft
Oligotrophic Lakes in Wisconsin
EPA Impairment Status
Shag Lake Northeast 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 MI040301100206-02 · Official waterbody report · Matched by proximity (0.76 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: 2023-09-23
Monitoring stations: 1