Island Lake; Republic Township is a mesotrophic lake in Marquette County, Michigan. Water quality is graded B based on 1 sampling years through 2023. The lake supports 4 documented fish species including Largemouth bass, Pumpkinseed, and Walleye. Public access is available with 4 public boat landings. Compared to the 9 other monitored lakes in Marquette County, Island Lake; Republic Township ranks #8 for water quality.
Source: EPA Water Quality Portal sampling records, Michigan DNR, last sampled 2023-09-12. Grade methodology: LakeGrade methodology.
Watch Island Lake; Republic Township water quality
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Swimming Safety
Good for swimming, clear water with low algae levels
Water Quality Grade: B, Good
Good clarity, visible to about 12 ft. Trophic State Index: 41.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 12 ft | B |
| Phosphorus | No data | |
| Chlorophyll-a (Algae) | No data | |
| Trophic State Index (TSI) | 41 | Mesotrophic |
Moderate nutrients, good water quality
Where to stay near Island Lake; Republic Township
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Fish Species
Click a species to see every graded lake where it is documented.
Fishing Island Lake; Republic Township
Recreation & Access
Location & Depth Map
Free interactive depth-contour map of Island Lake; Republic Township, reaching a maximum surveyed depth of 28 ft. Toggle Depth contours to overlay the bathymetric survey lines. Contour data from Michigan DNR.
County Ranking
Ranked #8 of 10 lakes in Marquette County
Cleaner Lakes Within 30 Miles
Island Lake; Republic Township holds Grade B. 2 nearby lakes hold higher grades.
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Moderate nutrients, good water quality
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Other Grade B Lakes in Michigan
Iron County · Clarity: 13 ft
Iron County · Clarity: 12.5 ft
Iron County · Clarity: 11 ft
Iron County · Clarity: 11 ft
Iron County · Clarity: 13.5 ft
Iron County · Clarity: 11 ft
Mesotrophic Lakes in Michigan
More records, surveys & data sources
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
Lake size & watershed from HydroLAKES (HydroSHEDS)
Grading methodology based on Metropolitan Council standards
Public boat-access points from the USGS National Boat Ramps inventory
Most recent sample: 2023-09-12
Monitoring stations: 1