Long Lake
Gogebic County, Michigan172 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
- 60 ft max depth
- Limited data
Long Lake in Gogebic County, Michigan is not rated for water quality — its monitoring record does not meet the evidence bar. Water clarity: 12 ft visibility. Maximum depth: 60 ft. Surface area: 172.2 acres.
- Clarity
- 12 ft
- Max depth
- 60 ft
- Area
- 172 acres
- Trend
- ↑ Improving
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Watch Long Lake’s letter
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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.
Why Long Lake has no grade
Long 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, Long Lake is Not Rated — not an F. Its 12-foot median from 44 readings collected 2016–2021 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.
Long Lake is a 172-acre lake in Gogebic County, Michigan with a maximum depth of 60 feet. Overall water quality is improving over recent sampling years. The lake supports 40 documented fish species including Blackchin shiner, Blacknose shiner, and Blackside darter.
Source: EPA Water Quality Portal sampling records, EGLE, last sampled 2021-09-15. Grade methodology: LakeQuality methodology.
What Long Lake is good for
From access and monitoring records, not editorial picks.
- Clear water12 ft of visibility
- Fishing40 species recorded
- Deep water60 ft surveyed max depth
Swimming Safety
Not ratedLimited data
The letter is not a swimming clearance. Long Lake is listed impaired under Clean Water Act §303(d) (IR 4A) for mercury. Check local advisories before you swim.
Water quality measurements for Long 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 | 60 ft |
| Surface Area | 172 acres |
Fish Species
Click a species to see every graded lake where it is documented.
Fishing Long Lake
Water Quality Trend: ↑ Improving
Based on 7 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Water Clarity | ↑ Improving | +0.381 m/yr | 7 |
| Phosphorus | ↑ Improving | -0.63 µg/L/yr | 7 |
| Chlorophyll-a | ↓ Declining | +2.4 µg/L/yr | 2 |
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)
Graded lakes near Long Lake
Long Lake has no grade, but these lakes within a short drive do.
Nearby Lakes in Gogebic County
Frequently asked questions about Long Lake
Where is Long Lake?
- Long 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 Long Lake?
- Long Lake in Gogebic County, Michigan is not rated for water quality — its monitoring record does not meet the evidence bar. Water clarity: 12 ft visibility. Maximum depth: 60 ft. Surface area: 172.2 acres.
Is Long Lake safe to swim in?
- The letter is not a swimming clearance. Long Lake is listed impaired under Clean Water Act §303(d) (IR 4A) for mercury. Check local advisories before you swim.
How deep is Long Lake?
- Long Lake has a maximum depth of 60 feet. The lake covers 172.2 acres.
What fish are in Long Lake?
- Fish species found in Long Lake include Blackchin shiner, Blacknose shiner, Blackside darter, Blackstripe topminnow, Bluegill, Bluntnose minnow, Brook silverside, Brown bullhead, Central mudminnow, Central stoneroller, Creek chub, Golden redhorse, Golden shiner, Grass pickerel, Green sunfish, Hornyhead chub, Iowa darter, Johnny darter, Lake herring, Lake whitefish, Largemouth bass, Longnose gar, Mimic shiner, Northern logperch, Northern longear sunfish, Northern pearl dace, Northern pike, Pumpkinseed, Rainbow trout, Rock bass, Sand shiner, Smallmouth bass, Spotted gar, Striped shiner, Walleye, Warmouth, Western banded killifish, White sucker, Yellow bullhead, Yellow perch. Long Lake is located in Gogebic County, Michigan.
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Where this data comes from
44 measurements from 1 monitoring station, 2016–2021. Retrieved from the EPA Water Quality Portal on 2026-08-26.
Collected and reported by
- North American Lake Management Society
NALMS44 samples · 2016–2021
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