Square Lake
Oakland County, Michigan81 acresView mapDirections
EGLE publishes the water-quality measurements for Square Lake. Here is what has been measured.
- 67 ft max depth
- Limited data
Square Lake in Oakland County, Michigan has water-quality measurements published by EGLE, shown here as reported. Water clarity: 23 ft visibility. Maximum depth: 67 ft. Surface area: 80.8 acres.
Free interactive depth-contour map of Square Lake, reaching a maximum surveyed depth of 67 ft. Toggle Depth contours to overlay the bathymetric survey lines. Contour data from Michigan DNR.
Square Lake is a 81-acre lake in Oakland County, Michigan with a maximum depth of 67 feet. Overall water quality is improving over recent sampling years. The lake supports 1 documented fish species including Lake herring.
Source: EPA Water Quality Portal sampling records, EGLE, last sampled 2022-09-09. Methodology: how these readings are compared.
What Square Lake is good for
From access and monitoring records, not editorial picks.
- Clear water23 ft of visibility
- Deep water67 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 Square 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 Square Lake
These are the measurements EGLE publishes for Square Lake, shown as reported. The condition class beside each reading is the EPA National Lakes Assessment class for this lake’s ecoregion.
Crystal clear, you can see 23 ft down. TSI 32.
| Measure | Reading | Where it sits |
|---|---|---|
| Water clarity (Secchi depth) | 23ft | 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. | 32 | Oligotrophic OligotrophicMesotrophicEutrophicHypereutrophic |
Low nutrients, clear water. No reading is a swimming clearance.
Ask about Square Lake
Answers come straight from the public measurements and survey records on this page.
Lake Details
Max depth
67 ft
Surface area
81 acres
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Stays near Square Lake
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Fish Species
Click a species to see every lake where it is documented.
Fishing Square Lake
Water Quality Trend: Improving
Based on 5 years of monitoring (2018–2023).
Water clarity
Improving5 years
Phosphorus
Improving-0.5 µg/L/yr4 years
Chlorophyll-a
Worsening+0.05 µg/L/yr3 years
Regulated Pollution Sources Nearby
11 EPA-permitted facilities operate within about 5 miles of Square Lake under Clean Water Act (NPDES) discharge permits, including 1 classified by the EPA as major discharger. 5 facilities have a reported Clean Water Act violation in the past three years.
- Oakland Co-Pontiac WwtpPontiac · 3.5 mi away · NPDES MI0023825MajorRecent violation
- Racer-Pontiac Sw Det FacPontiac · 2.2 mi away · NPDES MI0056031Recent violation
- Pontiac MS4-OaklandPontiac · 2.2 mi away · NPDES MI0060086Recent violation
- Gm-Pontiac Centerpoint CampusPontiac · 2.6 mi away · NPDES MIG250478Recent violation
- Bloomfield Hills MS4-OaklandBloomfield Hills · 3.9 mi away · NPDES MI0059975Recent violation
- Gmc Truck & Bus GroupPontiac · 1.4 mi away · NPDES MIP000125
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 Square Lake
Where is Square Lake?
- Square 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 Square Lake?
- Square Lake in Oakland County, Michigan has water-quality measurements published by EGLE, shown here as reported. Water clarity: 23 ft visibility. Maximum depth: 67 ft. Surface area: 80.8 acres.
Is Square Lake safe to swim in?
- Nutrient and algae readings are not a swimming clearance. Check local advisories before you swim.
How deep is Square Lake?
- Square Lake has a maximum depth of 67 feet. The lake covers 80.8 acres.
What fish are in Square Lake?
- Fish species found in Square Lake include Lake herring. Square Lake is located in Oakland County, Michigan.
Explore Square Lake across LakeQuality
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Where this data comes from
40 measurements from 1 monitoring station, 2021–2022. Retrieved from the EPA Water Quality Portal on 2026-08-26.
Collected and reported by
- North American Lake Management Society
NALMS40 samples · 2021–2022
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)