Long Lake is a mesotrophic lake in Gogebic County, Michigan. Water quality is graded B based on 1 sampling years through 2021. Water clarity is improving over recent sampling years. The lake supports 40 documented fish species including Blackchin shiner, Blacknose shiner, and Blackside darter. Public access is available. Compared to the 39 other monitored lakes in Gogebic County, Long Lake ranks #9 for water quality.
Source: EPA Water Quality Portal sampling records, Michigan DNR, last sampled 2021-09-15. Grade methodology: LakeGrade methodology.
Watch Long Lake water quality
Subscribe for LakeQuality updates by email. No spam, unsubscribe anytime.
Swimming Safety
Good for swimming, clear water with low algae levels
Water Quality Grade: B, Good
Good clarity, visible to about 11.5 ft. Trophic State Index: 42.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 11.5 ft | B |
| Phosphorus | No data | |
| Chlorophyll-a (Algae) | No data | |
| Trophic State Index (TSI) | 42 | Mesotrophic |
Moderate nutrients, good water quality
Where to stay near Long Lake
Compare lakeside cabins, hotels, and vacation rentals near Long Lake in Gogebic County, Michigan — live availability and prices for your trip. Switch the map to Satellite to see the lake and how close each stay is to the water.
Top-rated places to stay near Long Lake
Availability and prices from Stay22 partners (Booking.com, Vrbo, Expedia). We may earn a commission from bookings, at no extra cost to you.
Planning a trip to Long Lake?
Get lake water-quality report cards plus the best cabin & lodging deals near Long Lake — straight to your inbox. No spam, unsubscribe anytime.
Planning a whole trip? See where to stay at Michigan’s top lakes →
Fish Species
Click a species to see every graded lake where it is documented.
Fishing Long Lake
Water Quality Trend: → Stable
Based on 3 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Water Clarity | ↑ Improving | +3.085 m/yr | 3 |
| Chlorophyll-a | ↓ Declining | +2.1 µg/L/yr | 2 |
Location & Depth Map
Free interactive depth-contour map of Long Lake, reaching a maximum surveyed depth of 60 ft. Toggle Depth contours to overlay the bathymetric survey lines. Contour data from Michigan DNR.
County Ranking
Ranked #9 of 40 lakes in Gogebic County
Nearby Lakes in Gogebic County
Explore Long Lake across LakeGrade
Fish species and top-graded lakes across Michigan
Fish species and best lakes in Gogebic County
Species activity outlook by water temperature and season
Top lakes and where to stay in the Upper Peninsula area
Where to stay at Michigan's top lakes, each with its grade
Moderate nutrients, good water quality
Michigan's cleanest and most-polluted lakes, ranked
More Michigan Lake Rankings
Other Grade B Lakes in Michigan
Iron County · Clarity: 14.5 ft
Iron County · Clarity: 11 ft
Iron County · Clarity: 13.5 ft
Iron County · Clarity: 11 ft
Iron County · Clarity: 11 ft
Iron County · Clarity: 13 ft
Mesotrophic Lakes in Michigan
More records, surveys & data sources
EPA Impairment Status
Long Lake 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 MI040201020101-14 · Official waterbody report · Matched by proximity (2.37 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: 2021-09-15
Monitoring stations: 1