What is the difference between Deer Lake and North Turtle Lake?

Deer Lake (Otter Tail County) holds Grade A with 12.3 ft clarity and 26 ft max depth. North Turtle Lake (Otter Tail County) holds Grade D with 4 ft clarity and 19 ft max depth.

Is Deer Lake or North Turtle Lake better for fishing?

Deer Lake has 16 documented fish species. North Turtle Lake has 12. The lake with more species and better water clarity (Secchi depth) generally supports more diverse and successful fishing.

Deer Lake vs North Turtle Lake

Water quality, depth, fish species, and recreation comparison.

Deer Lake has a higher water quality grade (A, Excellent) than North Turtle Lake (D, Poor). Both are in Otter Tail County, Minnesota.

Reviewed by LakeQuality Editorial Team · Updated Aug 2, 2026

Deer Lake and North Turtle Lake are both in Minnesota — a same-state head-to-head where the comparison comes down to lake-specific differences in depth, watershed, and monitoring history rather than the broader state-level water-quality regime. Deer Lake (A) is materially cleaner than North Turtle Lake (D). A gap that wide is unlikely to close in a single year of remediation work; it reflects multi-decade differences in the lakes themselves.

For a recreational visitor, the wider grade gap is decisive — Deer 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?

Deer Lake

Otter Tail County, Minnesota

Good clarity, visible to about 12.3 ft.

North Turtle Lake

Otter Tail County, Minnesota

Murky, only visible to about 4 ft.

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Side-by-Side Metrics

Metric	Deer Lake	North Turtle Lake
Overall Grade	A (Excellent) Better	D (Poor)
Water Clarity	12.3 ft Better	4 ft
Phosphorus	21 µg/L Better	54.5 µg/L
Chlorophyll-a (Algae)	4.8 µg/L Better	22 µg/L
Maximum Depth	26 ft Better	19 ft
Surface Area	447 acres	1,773 acres
Public Access	Yes	Yes
Fish Species	16 Better	12
Trophic State	mesotrophic	eutrophic

A green ✓ marks the better value for that metric (lower phosphorus / chlorophyll = cleaner; higher Secchi / depth / species count = better). Surface area and trophic state carry no tick — a bigger lake is not a better lake.

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Compare Deer Lake or North Turtle Lake against a different lake.

Deer Lake vs Pickerel Lake Deer Lake vs Silver Lake Deer Lake vs Pelican Lake North Turtle Lake vs South Turtle Lake North Turtle Lake vs Silver Lake North Turtle Lake vs Pelican Lake

Verdict

Deer Lake wins on overall water quality with a Grade A versus North Turtle Lake's Grade D. Water clarity: 12.3 ft vs 4 ft. For fishing diversity, Deer Lake also leads with 16 species.

Full Deer Lake report →Full North Turtle Lake report →All Otter Tail County lakes →Cleanest lakes in Minnesota →

Source: EPA National Aquatic Resource Surveys, 2026.