Thousand Island Lake
Gogebic County, Michigan1,008 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.
- Impaired · Mercury
- 40 ft max depth
- Public access
- Limited data
Thousand Island Lake in Gogebic County, Michigan is not rated for water quality — its monitoring record does not meet the evidence bar. Water clarity: 10 ft visibility. Maximum depth: 40 ft. Surface area: 1007.5 acres.
- Clarity
- 10 ft
- Max depth
- 40 ft
- Area
- 1,008 acres
- Trend
- ↑ Improving
- Public access
- Yes
Stays via Stay22
Stays near Thousand Island Lake
Compare lakeside cabins, hotels, and vacation rentals near Thousand Island 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 Thousand Island Lake
Prices for Sep 11–13, 4 adults. Change dates on the map below.
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 whole trip? See where to stay at Michigan’s top lakes →
Watch Thousand Island Lake’s letter
Email me if this lake’s grade moves. Grades stay free.
Or email
Free interactive depth-contour map of Thousand Island Lake, reaching a maximum surveyed depth of 40 ft. Toggle Depth contours to overlay the bathymetric survey lines. Contour data from Michigan DNR.
Why Thousand Island Lake has no grade
Thousand 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, Thousand Island Lake is Not Rated — not an F. Its 10-foot median from 80 readings collected 2016–2022 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.
Thousand Island Lake is a 1,008-acre lake in Gogebic County, Michigan with a maximum depth of 40 feet. Overall water quality is improving over recent sampling years. The lake supports 1 documented fish species including Lake herring. Public access is available with 1 public boat landing.
Source: EPA Water Quality Portal sampling records, EGLE, last sampled 2022-09-13. Grade methodology: LakeQuality methodology.
What Thousand Island Lake is good for
From access and monitoring records, not editorial picks.
- Clear water10 ft of visibility
- Boat launch1 documented ramp
- Deep water40 ft surveyed max depth
- Big water1,008 acres
Swimming Safety
Not ratedLimited data
The letter is not a swimming clearance. Thousand Island Lake is listed impaired under Clean Water Act §303(d) (IR 4A) for mercury. Check local advisories before you swim.
Water quality measurements for Thousand Island Lake
These readings exist but are not enough for an A–F grade — see why.
Good clarity, visible to about 10 ft. TSI 44.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 10 ft | Not graded |
| Phosphorus | No recent samples | |
| Chlorophyll-a (Algae) | No recent samples | |
| Trophic State Index (TSI) | 44 | Mesotrophic |
Moderate nutrients, good water quality
Lake Details
| Characteristic | Value |
|---|---|
| Maximum Depth | 40 ft |
| Surface Area | 1,008 acres |
| Public Access | Yes |
Recreation & Access
- Thousand Island LakePublic
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 Thousand Island Lake
Water Quality Trend: ↑ Improving
Based on 7 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Water Clarity | ↑ Improving | +0.451 m/yr | 7 |
| Phosphorus | ↑ Improving | -0.46 µg/L/yr | 7 |
EPA Impairment Status
Thousand Island 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 MI040201020101-03 · Official waterbody report
Graded lakes near Thousand Island Lake
Thousand Island Lake has no grade, but these lakes within a short drive do.
Nearby Lakes in Gogebic County
Frequently asked questions about Thousand Island Lake
Where is Thousand Island Lake?
- Thousand Island Lake is a lake in Gogebic 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 Thousand Island Lake?
- Thousand Island Lake in Gogebic County, Michigan is not rated for water quality — its monitoring record does not meet the evidence bar. Water clarity: 10 ft visibility. Maximum depth: 40 ft. Surface area: 1007.5 acres.
Is Thousand Island Lake safe to swim in?
- The letter is not a swimming clearance. Thousand Island Lake is listed impaired under Clean Water Act §303(d) (IR 4A) for mercury. Check local advisories before you swim.
How deep is Thousand Island Lake?
- Thousand Island Lake has a maximum depth of 40 feet. The lake covers 1007.5 acres.
What fish are in Thousand Island Lake?
- Fish species found in Thousand Island Lake include Lake herring. Thousand Island Lake is located in Gogebic County, Michigan.
Are there boat ramps on Thousand Island Lake?
- Thousand Island Lake has 1 documented boat landing in the USGS National Boat Ramps inventory. Named access points include Thousand Island Lake. Public access is listed as yes.
Explore Thousand Island Lake across LakeQuality
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
Michigan's cleanest and most-polluted lakes, ranked
More Michigan Lake Rankings
Other Lakes in Michigan
Mesotrophic Lakes in Michigan
Where this data comes from
80 measurements from 1 monitoring station, 2016–2022. Retrieved from the EPA Water Quality Portal on 2026-08-26.
Collected and reported by
- North American Lake Management Society
NALMS80 samples · 2016–2022
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
Impairment status from EPA ATTAINS 303(d) database
Named boat-access points from the USGS National Boat Ramps inventory