Long Lake
Burleigh County, North DakotaView mapDirections
ND DEQ publishes the water-quality measurements for Long Lake. Here is what has been measured.
- 53 ft max depth
- Limited data
Long Lake in Burleigh County, North Dakota has water-quality measurements published by ND DEQ, shown here as reported. Phosphorus: 420 µg/L.
Long Lake is a lake in Burleigh County, North Dakota with an estimated average depth of about 53 feet.
Source: EPA Water Quality Portal sampling records, NDDEQ, last sampled 2020-06-09. Methodology: how these readings are compared.
Swimming conditions
No readingLimited data
Nutrient and algae readings are not a swimming clearance. Check local advisories before you swim.
Whether Long 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 Long Lake
These are the measurements ND DEQ publishes for Long Lake, shown as reported. The condition class beside each reading is the EPA National Lakes Assessment class for this lake’s ecoregion.
No clarity data. Phosphorus 420 µg/L. TSI 91.
| Measure | Reading | Where it sits |
|---|---|---|
| Water clarity (Secchi depth) | No reading How deep a black-and-white disk stays visible from the surface. Higher is clearer. | |
| Total phosphorus | 420µg/L | Measured, not scored The nutrient that most limits algae growth in freshwater. More phosphorus, more algae potential. |
| Chlorophyll-a (algae) | No reading 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. | 91 | Hypereutrophic OligotrophicMesotrophicEutrophicHypereutrophic |
Very high nutrients, dense algae, poor clarity
Ask about Long Lake
Answers come straight from the public measurements and survey records on this page.
Lake Details
Max depth
~53 ft est.
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 Long Lake.
Lake Size & Watershed
Watershed (drainage) area
732 sq mi
HydroLAKES / HydroSHEDS
Surface area
14,891 acres
HydroLAKES / HydroSHEDS
Shoreline
46.7 mi
HydroLAKES / HydroSHEDS
Elevation
1,703 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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Fishing Long Lake
Nearby Lakes in Burleigh County
Frequently asked questions about Long Lake
Where is Long Lake?
- Long Lake is a lake in Burleigh 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 Long Lake?
- Long Lake in Burleigh County, North Dakota has water-quality measurements published by ND DEQ, shown here as reported. Phosphorus: 420 µg/L.
Is Long Lake safe to swim in?
- Nutrient and algae readings are not a swimming clearance. Check local advisories before you swim.
How deep is Long Lake?
- No published bathymetric survey covers Long Lake, so its depth has not been measured. The HydroLAKES global model estimates an average depth of about 53 feet, but that is a modelled estimate derived from surrounding terrain rather than a measurement on the water, so treat it as approximate.
Explore Long Lake across LakeQuality
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Where this data comes from
2 measurements from 1 monitoring station, 2020. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- North Dakota Department Of Environmental Quality
21NDHDWQ_WQX2 samples · 2020
Analytical methods
- Phosphorus by Colorimetry
- 4500 NO3 E ~ Nitrate in Water- Cadmium Reduction
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