Horsehead Lake Northwest Basin; Martiny Township
Mecosta County, WisconsinMesotrophic
Horsehead Lake Northwest Basin; Martiny Township is a mesotrophic lake in Mecosta County, MI. Water quality is graded A based on 2 sampling years through 2023. Compared to the 11 other monitored lakes in Mecosta County, Horsehead Lake Northwest Basin; Martiny Township ranks #2 for water quality.
Source: EPA Water Quality Portal sampling records, local state DNR records, last sampled 2023-09-14. Grade methodology: LakeGrade methodology.
Swimming Safety
Excellent for swimming, crystal clear water with minimal algae
Water Quality Grade: A, Excellent
Good clarity, visible to about 10 ft. Chlorophyll-a: 3.8 µg/L. Trophic State Index: 44.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 10 ft | B |
| Phosphorus | No data | |
| Chlorophyll-a (Algae) | 3.8 µg/L | A |
| Trophic State Index (TSI) | 44 | Mesotrophic |
Moderate nutrients, good water quality
Location
County Ranking
Ranked #2 of 12 lakes in Mecosta County
Nearby Lakes in Mecosta County
More Wisconsin Lake Rankings
Other Grade A Lakes in Wisconsin
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
Leelanau County · Clarity: 15.5 ft
Mesotrophic Lakes in Wisconsin
EPA Impairment Status
Horsehead Lake Northwest Basin; Martiny 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 MI040601020801-03 · Official waterbody report · Matched by proximity (0.49 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: 2023-09-14
Monitoring stations: 1