Island Lake
Marquette County, Michigan48 acresView mapDirections
Not Rated: one monitoring station are on record, but they measured water clarity only. LakeQuality’s A–F method grades total phosphorus, total nitrogen, chlorophyll-a, and turbidity; clarity is shown, not scored.
- 28 ft max depth
- Public access
- Limited data
Island Lake in Marquette County, Michigan is not rated for water quality — its monitoring record does not meet the evidence bar. Water clarity: 12 ft visibility. Maximum depth: 28 ft. Surface area: 47.6 acres.
- Clarity
- 12 ft
- Max depth
- 28 ft
- Area
- 48 acres
- Trend
- ↑ Improving
- Public access
- Yes
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Watch Island Lake’s letter
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Free interactive depth-contour map of Island Lake, reaching a maximum surveyed depth of 28 ft. Toggle Depth contours to overlay the bathymetric survey lines. Contour data from Michigan DNR.
Why Island Lake has no grade
Island Lake has monitoring on record from one station, but only water clarity was measured. LakeQuality’s A–F letter uses total phosphorus, total nitrogen, chlorophyll-a, and turbidity against EPA National Lakes Assessment condition classes. With none of those grading measurements on record, Island Lake is Not Rated — not an F. Its 12-foot median from 16 readings collected 2023 is still shown as clarity, but clarity alone cannot earn a letter.
Not Rated is EPA Integrated Reporting Category 3 — insufficient information. Everything below that has been measured is still reported on this page.
Sampling is run by EGLE and volunteer programs, and published through the EPA Water Quality Portal. Read the full grading methodology.
Island Lake is a 48-acre lake in Marquette County, Michigan with a maximum depth of 28 feet. Overall water quality is improving over recent sampling years. The lake supports 4 documented fish species including Largemouth bass, Pumpkinseed, and Walleye. Public access is available with 1 public boat landing.
Source: EPA Water Quality Portal sampling records, EGLE, last sampled 2023-09-12. Grade methodology: LakeQuality methodology.
What Island Lake is good for
From access and monitoring records, not editorial picks.
- Clear water12 ft of visibility
- Boat launch1 documented ramp
- Fishing4 species recorded
Swimming Safety
Not ratedLimited data
The letter is not a swimming clearance. Check local advisories before you swim.
Water quality measurements for Island Lake
These readings exist but are not enough for an A–F grade — see why.
Good clarity, visible to about 12 ft. TSI 41.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 12 ft | Not graded |
| Phosphorus | No recent samples | |
| Chlorophyll-a (Algae) | No recent samples | |
| Trophic State Index (TSI) | 41 | Mesotrophic |
Moderate nutrients, good water quality
Lake Details
| Characteristic | Value |
|---|---|
| Maximum Depth | 28 ft |
| Surface Area | 48 acres |
| Public Access | Yes |
Lake Size & Watershed
Size, shoreline, and watershed area from HydroLAKES (HydroSHEDS).
Recreation & Access
- Twin LakesPublic
Named access points in the USGS National Boat Ramps inventory, within about 3 miles. More lakes with boat ramps
Fish Species
Click a species to see every graded lake where it is documented.
Fishing Island Lake
Water Quality Trend: ↑ Improving
Based on 2 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Water Clarity | ↑ Improving | +1.733 m/yr | 2 |
Graded lakes near Island Lake
Island Lake has no grade, but these lakes within a short drive do.
Nearby Lakes in Marquette County
Frequently asked questions about Island Lake
Where is Island Lake?
- Island Lake is a lake in Marquette County, Michigan. LakeQuality has not rated this lake (UNRATED) — the only measurement available is water clarity, which is not a water-quality indicator on its own — EPA's National Lakes Assessment does not grade clarity.
What is the water quality grade for Island Lake?
- Island Lake in Marquette County, Michigan is not rated for water quality — its monitoring record does not meet the evidence bar. Water clarity: 12 ft visibility. Maximum depth: 28 ft. Surface area: 47.6 acres.
Is Island Lake safe to swim in?
- The letter is not a swimming clearance. Check local advisories before you swim.
How deep is Island Lake?
- Island Lake has a maximum depth of 28 feet. The lake covers 47.6 acres.
What fish are in Island Lake?
- Fish species found in Island Lake include Largemouth bass, Pumpkinseed, Walleye, Yellow perch. Island Lake is located in Marquette County, Michigan.
Are there boat ramps on Island Lake?
- Island Lake has 1 documented boat landing in the USGS National Boat Ramps inventory. Named access points include Twin Lakes. Public access is listed as yes.
Explore Island Lake across LakeQuality
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Where this data comes from
16 measurements from 1 monitoring station, 2023. Retrieved from the EPA Water Quality Portal on 2026-08-26.
Collected and reported by
- Michigan EGLE - MiCorps
21MICH_MICORPS16 samples · 2023
Monitoring station identifiers (1)
Grade thresholds from the EPA National Lakes Assessment (EPA 841-R-24-006, Table 6-3), applied by ecoregion. See how grades are calculated and data sources.
Other records on this page
Lake size & watershed from HydroLAKES (HydroSHEDS)
Named boat-access points from the USGS National Boat Ramps inventory