What is the water quality grade for Juanita Lake?

Juanita Lake in Foster County, North Dakota received a water quality grade of F (Very Poor). Water clarity: 1 ft visibility. Chlorophyll-a (algae): 154.2 µg/L. Maximum depth: 9.9 ft. Surface area: 732.7 acres.

Is Juanita Lake safe to swim in?

Avoid swimming, very poor water quality, potential algae toxins. Juanita Lake has an overall water quality grade of F. Algae concentration (chlorophyll-a) is 154.2 µg/L. Always check local health department advisories before swimming.

How deep is Juanita Lake?

Juanita Lake has a maximum depth of 9.9 feet and an average depth of 6.8 feet. The lake covers 732.7 acres.

What fish are in Juanita Lake?

Fish species found in Juanita Lake include Northern Pike, Yellow Perch, Black Bullhead, Common Carp. Juanita Lake is located in Foster County, North Dakota.

Foster County, North Dakota

Juanita Lake

Grade FVery Poor · 1 ft clarity

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Hypereutrophic

Juanita Lake is a 733-acre highly nutrient-loaded hypereutrophic lake in Foster County, North Dakota with a maximum depth of 10 feet (7-foot average). Water quality is graded F based on 2 sampling years through 2021. The lake supports 4 documented fish species including Northern Pike, Yellow Perch, and Black Bullhead. Public access is available with 1 public boat landing.

Source: EPA Water Quality Portal sampling records, North Dakota DNR, last sampled 2021-10-04. Grade methodology: LakeGrade methodology.

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Swimming Safety

Avoid swimming, very poor water quality, potential algae toxins

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Water Quality Grade: F, Very Poor

Very murky, less than 1 ft of visibility. Chlorophyll-a: 154.2 µg/L. Trophic State Index: 79.

Metric	Value	Grade
Water Clarity (Secchi Depth)	1 ft	F
Phosphorus	No data
Chlorophyll-a (Algae)	154.2 µg/L	F
Trophic State Index (TSI)	79	Hypereutrophic

Very high nutrients, dense algae, poor clarity

Lake Details

Characteristic	Value
Maximum Depth	9.9 ft
Average Depth	6.8 ft
Surface Area	733 acres
Shoreline Length	10.9 mi
Public Access	Yes

Where to stay near Juanita Lake

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Fish Species

Northern Pike Yellow Perch Black Bullhead Common Carp

Click a species to see every graded lake where it is documented.

Fishing Juanita Lake

Recreation & Access

Boat Landings

Yes

Public Access

Water Temperature

Juanita Lake averages about 63°F at the surface in summer, usually warmest in Jul (about 69°F) and coldest in May (about 47°F). These are typical values by month — not a live reading.