Sugarloaf Lake; Lyndon Twp is a 280-acre mesotrophic lake in Washtenaw County, Michigan. Water quality is graded B based on 2 sampling years through 2023. Overall water quality is improving over recent sampling years. The lake supports 2 documented fish species including Northern pike and Spotted gar. Public access is available with 3 public boat landings. Compared to the 16 other monitored lakes in Washtenaw County, Sugarloaf Lake; Lyndon Twp ranks #9 for water quality.
Source: EPA Water Quality Portal sampling records, Michigan DNR, last sampled 2023-09-24. Grade methodology: LakeGrade methodology.
Watch Sugarloaf Lake; Lyndon Twp water quality
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Swimming Safety
Good for swimming, clear water with low algae levels
Water Quality Grade: B, Good
Moderate clarity, visible to about 9.5 ft. Chlorophyll-a: 1.9 µg/L. Trophic State Index: 41.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 9.5 ft | C |
| Phosphorus | No data | |
| Chlorophyll-a (Algae) | 1.9 µg/L | A |
| Trophic State Index (TSI) | 41 | Mesotrophic |
Moderate nutrients, good water quality
Lake Details
| Characteristic | Value |
|---|---|
| Surface Area | 280 acres |
| Public Access | Yes |
Where to stay near Sugarloaf Lake; Lyndon Twp
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Fish Species
Click a species to see every graded lake where it is documented.
Fishing Sugarloaf Lake; Lyndon Twp
Water Quality Trend: ↑ Improving
Based on 2 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Water Clarity | ↑ Improving | +3.98 m/yr | 2 |
Recreation & Access
Location & Depth Map
Free interactive depth-contour map of Sugarloaf Lake; Lyndon Twp, reaching a maximum surveyed depth of 10 ft. Toggle Depth contours to overlay the bathymetric survey lines. Contour data from Michigan DNR.
County Ranking
Ranked #9 of 17 lakes in Washtenaw County
Cleaner Lakes Within 30 Miles
Sugarloaf Lake; Lyndon Twp holds Grade B. 3 nearby lakes hold higher grades.
- AClear Lake East Basin; Waterloo TownshipJackson County · 1.7 mi · Higher grade (B → A)
- ANorth Lake North Central Basin; Dexter TownshipWashtenaw County · 6.5 mi · Higher grade (B → A)
- ASilver LakeWashtenaw County · 9.6 mi · Higher grade (B → A)
Nearby Lakes in Washtenaw County
Explore Sugarloaf Lake; Lyndon Twp across LakeGrade
Fish species and top-graded lakes across Michigan
Fish species and best lakes in Washtenaw County
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
Michigan's cleanest and most-polluted lakes, ranked
More Michigan Lake Rankings
Other Grade B Lakes in Michigan
Jackson County · Clarity: 10 ft
Livingston County · Clarity: 13 ft
Livingston County · Clarity: 10.5 ft
Livingston County · Clarity: 10.5 ft
Livingston County · Clarity: 10.5 ft
Livingston County · Clarity: 9.5 ft
Mesotrophic Lakes in Michigan
More records, surveys & data sources
Reservoir Info (USACE NID)
Sugarloaf Lake; Lyndon Twp is a man-made reservoir impounded by the Winnewana Dam (completed 1956), built primarily for recreation on the Tributary to Portage River; earth-type dam, 12 ft tall and 270 ft long.
- Surface area
- 280 ac
- Normal storage
- 1,000 ac-ft
- Max storage
- 1,560 ac-ft
- Drainage area
- 1.8 sq mi
- Hazard class
- Significant
- Owner
- MDNR Parks & Recreation
Source: USACE National Inventory of Dams, NID ID MI00327 · Operator website · Matched by proximity (0.8 km)
Lake Size & Watershed
Size, shoreline, and watershed area from HydroLAKES (HydroSHEDS). Mean depth is a modeled estimate.
Data Sources
Water quality data from the EPA Water Quality Portal
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: 2023-09-24
Monitoring stations: 1