Triangle Lake
Livingston County, Michigan53 acresView mapDirections
EGLE publishes the water-quality measurements for Triangle Lake. Here is what has been measured.
- 43 ft max depth
- Limited data
Triangle Lake in Livingston County, Michigan has water-quality measurements published by EGLE, shown here as reported. Water clarity: 9.5 ft visibility. Phosphorus: 24.5 µg/L. Surface area: 53.2 acres.
Triangle Lake is a 53-acre lake in Livingston County, Michigan with an estimated average depth of about 43 feet. Overall water quality is improving over recent sampling years.
Source: EPA Water Quality Portal sampling records, EGLE, last sampled 2023-09-18. Methodology: how these readings are compared.
Swimming conditions
No readingLimited data
Nutrient and algae readings are not a swimming clearance. Check local advisories before you swim.
Whether Triangle 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 Triangle Lake
These are the measurements EGLE publishes for Triangle Lake, shown as reported. The condition class beside each reading is the EPA National Lakes Assessment class for this lake’s ecoregion.
Moderate clarity, visible to about 9.5 ft. Phosphorus 24.5 µg/L. TSI 47.
| Measure | Reading | Where it sits |
|---|---|---|
| Water clarity (Secchi depth) | 9.5ft | Measured, not scored How deep a black-and-white disk stays visible from the surface. Higher is clearer. |
| Total phosphorus | 24.5µg/L | Measured, not scored 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. | 47 | Mesotrophic OligotrophicMesotrophicEutrophicHypereutrophic |
Moderate nutrients, good water quality
Ask about Triangle Lake
Answers come straight from the public measurements and survey records on this page.
Water Temperature
Triangle Lake typically sits around 70°F at the surface in September. Summer average is about 71°F. Usually warmest in Aug (about 74°F) and coldest in May (about 61°F). These are typical values by month — not a live reading.
Column height runs from this lake’s coldest month (61°F) to its warmest (74°F).
Typical surface water temperature by month, from 366 field readings (2010–2014) via the EPA Water Quality Portal. See the full Triangle Lake water temperature breakdown →
Lake Details
Max depth
~43 ft est.
Surface area
53 acres
Depth marked “est.” is a modeled maximum from GLOBathy (Khazaei et al. 2022, CC0), not a measured survey. Michigan has not published bathymetry for Triangle Lake.
Lake Size & Watershed
Watershed (drainage) area
2 sq mi
HydroLAKES / HydroSHEDS
Shoreline
1.2 mi
HydroLAKES / HydroSHEDS
Elevation
938 ft
Size, shoreline, and watershed area from HydroLAKES (HydroSHEDS). Mean depth here is modelled, not surveyed — HydroLAKES v1.0 estimates lake depth from surrounding terrain rather than from soundings. Treat it as an approximation, and prefer a state bathymetric survey where one exists.
Stays via Stay22
Stays near Triangle Lake
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Fishing Triangle Lake
Water quality readings over time
2 seasons of samples on record (2021–2023). Calling a direction takes at least 4 years of the same measurement.
Phosphorus
Improving-0.5 µg/L/yr2 years
Regulated Pollution Sources Nearby
3 EPA-permitted facilities operate within about 5 miles of Triangle Lake under Clean Water Act (NPDES) discharge permits.
- Marion TownshipHowell · 0.8 mi away · NPDES MIG610198
- D & J Gravel Co Inc-Plant IiHowell · 1.5 mi away · NPDES MIG490234
- Lakeland Montessori SchoolLakeland · 2.5 mi away · NPDES MIG081085
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 Livingston County
Frequently asked questions about Triangle Lake
Where is Triangle Lake?
- Triangle Lake is a lake in Livingston County, Michigan. Its water-quality measurements are published by EGLE and shown on this page as reported.
What is the water quality of Triangle Lake?
- Triangle Lake in Livingston County, Michigan has water-quality measurements published by EGLE, shown here as reported. Water clarity: 9.5 ft visibility. Phosphorus: 24.5 µg/L. Surface area: 53.2 acres.
Is Triangle Lake safe to swim in?
- Nutrient and algae readings are not a swimming clearance. Check local advisories before you swim.
What is the water temperature of Triangle Lake?
- Triangle Lake typically sits around 70°F at the surface in September, from 366 EPA Water Quality Portal field readings (2010–2014). That is a typical value for the month, not a live reading.
How deep is Triangle Lake?
- No published bathymetric survey covers Triangle Lake, so its depth has not been measured. The HydroLAKES global model estimates an average depth of about 43 feet, but that is a modelled estimate derived from surrounding terrain rather than a measurement on the water, so treat it as approximate. The lake covers 53.2 acres.
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Where this data comes from
15 measurements from 1 monitoring station, 2021–2023. Retrieved from the EPA Water Quality Portal on 2026-08-26.
Collected and reported by
- Michigan EGLE - MiCorps
21MICH_MICORPS15 samples · 2021–2023
Analytical methods
- Phosphorus by Colorimetry
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)
Lake size & watershed from HydroLAKES (HydroSHEDS)