Long Lake Southeast Basin; Lyndon Township is a mesotrophic lake in Washtenaw County, Michigan. Water quality is graded C based on 1 sampling years through 2023. Limited fish-species data available. Public access is available with 2 public boat landings. Compared to the 16 other monitored lakes in Washtenaw County, Long Lake Southeast Basin; Lyndon Township ranks #13 for water quality.
Source: EPA Water Quality Portal sampling records, Michigan DNR, last sampled 2023-08-30. Grade methodology: LakeGrade methodology.
Watch Long Lake Southeast Basin; Lyndon Township water quality
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Swimming Safety
Generally safe for swimming, moderate water quality
Water Quality Grade: C, Fair
Moderate clarity, visible to about 9 ft. Trophic State Index: 45.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 9 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 Long Lake Southeast Basin; Lyndon Township
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Fishing Long Lake Southeast Basin; Lyndon Township
Recreation & Access
Location & Depth Map
Free interactive depth-contour map of Long Lake Southeast Basin; Lyndon Township, reaching a maximum surveyed depth of 30 ft. Toggle Depth contours to overlay the bathymetric survey lines. Contour data from Michigan DNR.
County Ranking
Ranked #13 of 17 lakes in Washtenaw County
Cleaner Lakes Within 30 Miles
Long Lake Southeast Basin; Lyndon Township holds Grade C. 4 nearby lakes hold higher grades.
- ANorth Lake North Central Basin; Dexter TownshipWashtenaw County · 4 mi · Two grade letters higher (C → A)
- AClear Lake East Basin; Waterloo TownshipJackson County · 4.4 mi · Two grade letters higher (C → A)
- ASilver LakeWashtenaw County · 7 mi · Two grade letters higher (C → A)
- BSugarloaf Lake; Lyndon TwpWashtenaw County · 2.8 mi · Higher grade (C → B)
Nearby Lakes in Washtenaw County
Explore Long Lake Southeast Basin; Lyndon Township across LakeGrade
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Moderate nutrients, good water quality
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Other Grade C Lakes in Michigan
Livingston County · Clarity: 7 ft
Livingston County · Clarity: 8 ft
Livingston County · Clarity: 9.5 ft
Livingston County · Clarity: 9.5 ft
Livingston County · Clarity: 8 ft
Livingston County · Clarity: 5.5 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
1 EPA-permitted facility operate within about 5 miles of Long Lake Southeast Basin; Lyndon Township under Clean Water Act (NPDES) discharge permits, including 1 classified by the EPA as major discharger. 1 facility has a reported Clean Water Act violation in the past three years.
- Chelsea WwtpChelsea · 3 mi away · NPDES MI0020737MajorRecent violation
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
Public boat-access points from the USGS National Boat Ramps inventory
Most recent sample: 2023-08-30
Monitoring stations: 1