Sugarloaf Lake
Washtenaw County, WisconsinLimited DataMesotrophic
Sugarloaf Lake is a 280-acre mesotrophic lake in Washtenaw County, MI. Water quality is graded C based on 1 sampling years through 2022. The lake supports 2 documented fish species including Northern pike and Spotted gar. Compared to the 16 other monitored lakes in Washtenaw County, Sugarloaf Lake ranks #12 for water quality.
Source: EPA Water Quality Portal sampling records, local state DNR records, last sampled 2022-09-12. Grade methodology: LakeGrade methodology.
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
Lake Details
| Characteristic | Value |
|---|---|
| Surface Area | 280 acres |
Fish Species
Click a species to see all Wisconsin and Minnesota lakes where it is found.
→ Best fishing times for Sugarloaf Lake (14-day solunar calendar)
→ Is it safe to eat fish from Sugarloaf Lake? (mercury & PFAS guide)
→ Sugarloaf Lake fishing regulations (limits, seasons, special rules)
Location
County Ranking
Ranked #12 of 17 lakes in Washtenaw County
Cleaner Lakes Within 30 Miles
Sugarloaf Lake holds Grade C. 4 nearby lakes hold higher grades.
- AClear Lake East Basin; Waterloo TownshipJackson County · 1.7 mi · Two grade letters higher (C → A)
- ANorth Lake North Central Basin; Dexter TownshipWashtenaw County · 6.5 mi · Two grade letters higher (C → A)
- ASilver LakeWashtenaw County · 9.6 mi · Two grade letters higher (C → A)
- BSugarloaf Lake; Lyndon TwpWashtenaw County · 0 mi · Higher grade (C → B)
Nearby Lakes in Washtenaw County
More Wisconsin Lake Rankings
Other Grade C Lakes in Wisconsin
Cass County · Clarity: 7 ft
Leelanau County · Clarity: 9.5 ft
Iosco County · Clarity: 5.5 ft
Muskegon County · Clarity: 6.8 ft
Gladwin County · Clarity: 9 ft
Montmorency County · Clarity: 9 ft
Mesotrophic Lakes in Wisconsin
Reservoir Info (USACE NID)
Sugarloaf Lake 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 (0.82 km)
Data Sources
Water quality data from the EPA Water Quality Portal
Grading methodology based on Metropolitan Council standards
Most recent sample: 2022-09-12
Monitoring stations: 1