Golden Horseshoe County Lake Quality
Ontario, 3 lakes, average grade C (Fair)
Golden Horseshoe County has 3 graded lakes — a thin enough sample that one or two stressed lakes can move the county average noticeably. Use the per-lake pages below for what actually matters. Golden Horseshoe County averages to a C. The distribution behind that average matters more than the letter: a few stressed lakes versus many decent ones can produce the same average as the inverse.
The county's lakes lean shallow, which makes the grades sensitive to wind, sediment-resuspension, and any nutrient inputs from the watershed. The cleanest lake on the books is Erie Lake (A); the most-stressed is G Ross Lord Reservoir (F).
Quick Answers for Golden Horseshoe County
Planning a trip? Check special fishing regulations for Erie Lake — or check the official Ontario fishing regulations.
All Lakes in Golden Horseshoe County
| Rank | Lake | Grade | Clarity | Phosphorus |
|---|---|---|---|---|
| 1 | Erie Lake | A | 20.7 ft | 8.1 µg/L |
| 2 | Grenadier Pond | D | 3.3 ft | 63.1 µg/L |
| 3 | G Ross Lord Reservoir | F | 1.3 ft | - |
Other Counties in Ontario
See how Golden Horseshoe County stacks up in the national county water-quality rankings, or browse the full directory of graded lakes across all 38 states.
Where to stay near Golden Horseshoe County
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Source: EPA National Aquatic Resource Surveys, 2026.