Long Lake
Oakland County, Michigan104 acresView mapDirections
EGLE publishes the water-quality measurements for Long Lake. Here is what has been measured.
- 50 ft max depth
- Limited data
Long Lake in Oakland County, Michigan has water-quality measurements published by EGLE, shown here as reported. Water clarity: 13 ft visibility. Maximum depth: 50 ft. Surface area: 103.8 acres.
Free interactive depth-contour map of Long Lake, reaching a maximum surveyed depth of 50 ft. Toggle Depth contours to overlay the bathymetric survey lines. Contour data from Michigan DNR.
Long Lake is a 104-acre lake in Oakland County, Michigan with a maximum depth of 50 feet. Overall water quality is declining over recent sampling years. The lake supports 1 documented fish species including Yellow bullhead.
Source: EPA Water Quality Portal sampling records, EGLE, last sampled 2022-09-11. Methodology: how these readings are compared.
What Long Lake is good for
From access and monitoring records, not editorial picks.
- Clear water13 ft of visibility
- Deep water50 ft surveyed max depth
Swimming conditions
No readingLimited data
Nutrient and algae readings are not a swimming clearance. Check local advisories before you swim.
Whether Long Lake is safe to swim in today is a call for the Michigan Department of Environment, Great Lakes, and Energy (EGLE) and the county health department, who post current advisories. LakeQuality does not issue swimming clearances.
Water quality measurements for Long Lake
These are the measurements EGLE publishes for Long Lake, shown as reported. The condition class beside each reading is the EPA National Lakes Assessment class for this lake’s ecoregion.
Good clarity, visible to about 13 ft. TSI 40.
| Measure | Reading | Where it sits |
|---|---|---|
| Water clarity (Secchi depth) | 13ft | Measured, not scored How deep a black-and-white disk stays visible from the surface. Higher is clearer. |
| Total phosphorus | No reading The nutrient that most limits algae growth in freshwater. More phosphorus, more algae potential. | |
| Chlorophyll-a (algae) | No reading The green pigment in algae — a direct measure of how much algae is in the water. | |
| Trophic state (TSI)Carlson's 0–100 index of how much algae a lake can support, from clarity, phosphorus and chlorophyll-a. | 40 | Mesotrophic OligotrophicMesotrophicEutrophicHypereutrophic |
Moderate nutrients, good water quality
Ask about Long Lake
Answers come straight from the public measurements and survey records on this page.
Lake Details
Max depth
50 ft
Surface area
104 acres
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Stays near Long Lake
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Fish Species
Click a species to see every lake where it is documented.
Fishing Long Lake
Water Quality Trend: Worsening
Based on 8 years of monitoring (2016–2023).
Water clarity
Stable8 years
Phosphorus
Worsening+1 µg/L/yr7 years
Chlorophyll-a
Stable+0.02 µg/L/yr7 years
Regulated Pollution Sources Nearby
5 EPA-permitted facilities operate within about 5 miles of Long Lake under Clean Water Act (NPDES) discharge permits. 3 facilities have a reported Clean Water Act violation in the past three years.
- Lake Orion MS4-OaklandLake Orion · 0.4 mi away · NPDES MI0060148Recent violation
- Oxford Ps MS4-OaklandOxford · 2.4 mi away · NPDES MI0060187Recent violation
- Oxford MS4-OaklandOxford · 2.8 mi away · NPDES MI0060186Recent violation
- Aam-OxfordOxford · 4.4 mi away · NPDES MI0054054
- American Aggregates Of MichOxford · 4.4 mi away · NPDES MIG490246
Facilities permitted to discharge under the Clean Water Act within ~5 miles; proximity does not by itself mean a facility affects this lake. Source: EPA ECHO (ICIS-NPDES), as of 2026-07.
Nearby Lakes in Oakland County
Frequently asked questions about Long Lake
Where is Long Lake?
- Long Lake is a lake in Oakland County, Michigan. Its water-quality measurements are published by EGLE and shown on this page as reported.
What is the water quality of Long Lake?
- Long Lake in Oakland County, Michigan has water-quality measurements published by EGLE, shown here as reported. Water clarity: 13 ft visibility. Maximum depth: 50 ft. Surface area: 103.8 acres.
Is Long Lake safe to swim in?
- Nutrient and algae readings are not a swimming clearance. Check local advisories before you swim.
How deep is Long Lake?
- Long Lake has a maximum depth of 50 feet. The lake covers 103.8 acres.
What fish are in Long Lake?
- Fish species found in Long Lake include Yellow bullhead. Long Lake is located in Oakland County, Michigan.
Explore Long Lake across LakeQuality
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Where this data comes from
107 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
NALMS107 samples · 2016–2022
Monitoring station identifiers (1)
EPA condition classes from the National Lakes Assessment (EPA 841-R-24-006, Table 6-3), applied by ecoregion. See where the data comes from and data sources.
Other records on this page
Regulated discharger data from EPA ECHO (ICIS-NPDES)