Juanita Lake
Foster County, North DakotaView mapDirections
ND DEQ publishes the water-quality measurements for Juanita Lake. Here is what has been measured.
- 52 ft max depth
- Public access
- Limited data
Juanita Lake in Foster County, North Dakota has water-quality measurements published by ND DEQ, shown here as reported. Water clarity: 1 ft visibility. Chlorophyll-a (algae): 154.2 µg/L.
Juanita Lake is a lake in Foster County, North Dakota with an estimated average depth of about 52 feet. Limited fish-species data available. Public access is available.
Source: EPA Water Quality Portal sampling records, NDDEQ, last sampled 2021-10-04. Methodology: how these readings are compared.
For a place on the water, look through cabin and lake-house rentals near Juanita Lake on Vrbo. For a hotel or motel room, Booking.com and Expedia both search around the lake.
Swimming conditions
No readingLimited data
Nutrient and algae readings are not a swimming clearance. Check local advisories before you swim.
Whether Juanita Lake is safe to swim in today is a call for the North Dakota Department of Environmental Quality and the county health department, who post current advisories. LakeQuality does not issue swimming clearances.
Water quality measurements for Juanita Lake
These are the measurements ND DEQ publishes for Juanita Lake, shown as reported. The condition class beside each reading is the EPA National Lakes Assessment class for this lake’s ecoregion.
Very murky, less than 1 ft of visibility. Chlorophyll-a 154.2 µg/L. TSI 79.
| Measure | Reading | Where it sits |
|---|---|---|
| Water clarity (Secchi depth) | 1ft | Measured, not scored How deep a black-and-white disk stays visible from the surface. Higher is clearer. |
| Total phosphorus | No reading The nutrient that most limits algae growth in freshwater. More phosphorus, more algae potential. | |
| Chlorophyll-a (algae) | 154µg/L | Measured, not scored The green pigment in algae — a direct measure of how much algae is in the water. |
| Trophic state (TSI)Carlson's 0–100 index of how much algae a lake can support, from clarity, phosphorus and chlorophyll-a. | 79 | Hypereutrophic OligotrophicMesotrophicEutrophicHypereutrophic |
Very high nutrients, dense algae, poor clarity
Ask about Juanita Lake
Answers come straight from the public measurements and survey records on this page.
Water Temperature
Juanita Lake typically sits around 55°F at the surface in October. Summer average is about 63°F. Usually warmest in Jul (about 69°F) and coldest in May (about 47°F). These are typical values by month — not a live reading.
Column height runs from this lake’s coldest month (47°F) to its warmest (69°F).
Typical surface water temperature by month, from 12 field readings (2021–2021) via the EPA Water Quality Portal. See the full Juanita Lake water temperature breakdown →
Lake Details
Max depth
~52 ft est.
Public access
Yes
Listed by ND DEQ
Depth marked “est.” is a modeled maximum from GLOBathy (Khazaei et al. 2022, CC0), not a measured survey. North Dakota has not published bathymetry for Juanita Lake.
Lake Size & Watershed
Watershed (drainage) area
137 sq mi
HydroLAKES / HydroSHEDS
Surface area
608 acres
HydroLAKES / HydroSHEDS
Shoreline
6.5 mi
HydroLAKES / HydroSHEDS
Elevation
1,444 ft
Size, shoreline, and watershed area from HydroLAKES (HydroSHEDS). Mean depth here is modelled, not surveyed — HydroLAKES v1.0 estimates lake depth from surrounding terrain rather than from soundings. Treat it as an approximation, and prefer a state bathymetric survey where one exists.
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Stays near Juanita Lake
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Fishing Juanita Lake
Nearby Lakes in Foster County
Frequently asked questions about Juanita Lake
Where is Juanita Lake?
- Juanita Lake is a lake in Foster County, North Dakota. Its water-quality measurements are published by ND DEQ and shown on this page as reported.
What is the water quality of Juanita Lake?
- Juanita Lake in Foster County, North Dakota has water-quality measurements published by ND DEQ, shown here as reported. Water clarity: 1 ft visibility. Chlorophyll-a (algae): 154.2 µg/L.
Is Juanita Lake safe to swim in?
- Nutrient and algae readings are not a swimming clearance. Check local advisories before you swim.
What is the water temperature of Juanita Lake?
- Juanita Lake typically sits around 55°F at the surface in October, from 12 EPA Water Quality Portal field readings (2021–2021). That is a typical value for the month, not a live reading.
How deep is Juanita Lake?
- No published bathymetric survey covers Juanita Lake, so its depth has not been measured. The HydroLAKES global model estimates an average depth of about 52 feet, but that is a modelled estimate derived from surrounding terrain rather than a measurement on the water, so treat it as approximate.
Can I fish at Juanita Lake?
- Public access to Juanita Lake is listed as yes on the lake record. Seasons, size and bag limits, and whether you need a license are set by North Dakota's fish and wildlife agency, so check its current regulations before you go.
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Where this data comes from
8 measurements from 1 monitoring station, 2021. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- North Dakota Department Of Environmental Quality
21NDHDWQ_WQX8 samples · 2021
Analytical methods
- 447.0 ~ EPA; Chlorophyll a and b in phytoplankton by HPLC/UV
Monitoring station identifiers (1)
EPA condition classes from the National Lakes Assessment (EPA 841-R-24-006, Table 6-3), applied by ecoregion. See where the data comes from and data sources.
Other records on this page
Lake size & watershed from HydroLAKES (HydroSHEDS)
Depth, fish, and access data from North Dakota Game & Fish