Guilford Lake vs Plymouth Reservoir
Water quality, depth, fish species, and recreation comparison.
Guilford Lake has a higher water quality grade (B, Good) than Plymouth Reservoir (D, Poor). Both are in Chenango County, Wisconsin.
Both Guilford Lake and Plymouth Reservoir sit in New York. A same-state comparison strips out the state-level water-quality regime as a variable: any grade differences here are about the lakes themselves, not the agencies grading them. The grades are meaningfully apart: Guilford Lake grades a B while Plymouth Reservoir grades a D. That two-letter spread reflects real underlying differences — different watershed inputs, different depth profiles, or different monitoring rigor.
For a recreational visitor, the wider grade gap is decisive — Guilford Lake is the better water-quality choice. For a researcher, the gap is the interesting part: what is different about the two watersheds, and which of those differences is mutable?
Guilford Lake
Good clarity, visible to about 13.8 ft.
Plymouth Reservoir
Murky, only visible to about 6.2 ft.
Side-by-Side Metrics
| Metric | Guilford Lake | Plymouth Reservoir |
|---|---|---|
| Overall Grade | B (Good) | D (Poor) |
| Water Clarity | 13.8 ft | 6.2 ft |
| Phosphorus | No data | No data |
| Chlorophyll-a (Algae) | No data | No data |
| Maximum Depth | - | - |
| Surface Area | 74 acres | 77 acres |
| Public Access | Unknown | Unknown |
| Fish Species | 0 | 0 |
| Trophic State | oligotrophic | eutrophic |
Bold value = better for that metric (lower phosphorus / chlorophyll = cleaner; higher Secchi / depth / species count = better).
Verdict
Guilford Lake wins on overall water quality with a Grade B versus Plymouth Reservoir's Grade D. Water clarity: 13.8 ft vs 6.2 ft. For fishing diversity, Guilford Lake also leads with 0 species.