Triangle Lake is a mesotrophic lake in Livingston County, Michigan. Water quality is graded C based on 1 sampling years through 2023. Limited fish-species data available. Public access is available. Compared to the 19 other monitored lakes in Livingston County, Triangle Lake ranks #17 for water quality.
Source: EPA Water Quality Portal sampling records, Michigan DNR, last sampled 2023-08-29. Grade methodology: LakeGrade methodology.
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Swimming Safety
Generally safe for swimming, moderate water quality
Water Quality Grade: C, Fair
Moderate clarity, visible to about 9.5 ft. Trophic State Index: 45.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 9.5 ft | C |
| Phosphorus | No data | |
| Chlorophyll-a (Algae) | No data | |
| Trophic State Index (TSI) | 45 | Mesotrophic |
Moderate nutrients, good water quality
Where to stay near Triangle Lake
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Fishing Triangle Lake
Water Temperature
Triangle Lake averages about 71°F at the surface in summer, usually warmest in Aug (about 74°F) and coldest in May (about 61°F). These are typical values by month — not a live reading.
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 →
Location
County Ranking
Ranked #17 of 20 lakes in Livingston County
Cleaner Lakes Within 30 Miles
Triangle Lake holds Grade C. 2 nearby lakes hold higher grades.
Nearby Lakes in Livingston County
Explore Triangle Lake across LakeGrade
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Species activity outlook by water temperature and season
Where to stay at Michigan's top lakes, each with its grade
Moderate nutrients, good water quality
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Other Grade C Lakes in Michigan
Washtenaw County · Clarity: 9 ft
Washtenaw County · Clarity: 9.5 ft
Genesee County · Clarity: 9 ft
Shiawassee County · Clarity: 5 ft
Shiawassee County · Clarity: 6 ft
Shiawassee County · Clarity: 8 ft
Mesotrophic Lakes in Michigan
More records, surveys & data sources
Lake Size & Watershed
Size, shoreline, and watershed area from HydroLAKES (HydroSHEDS). Mean depth is a modeled estimate.
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.
Data Sources
Water quality data from the EPA Water Quality Portal
Regulated discharger data from EPA ECHO (ICIS-NPDES)
Lake size & watershed from HydroLAKES (HydroSHEDS)
Grading methodology based on Metropolitan Council standards
Most recent sample: 2023-08-29
Monitoring stations: 1