Burleigh County, North Dakota · Water Quality Report Card
Long Lake
Long Lake in Burleigh County, North Dakota is not rated for water quality — its monitoring record does not meet the evidence bar. Phosphorus: 420 µg/L.
- Mean depth
- ~12 ft est.
- Type
- Hypereutrophic
Long Lake is a highly nutrient-loaded hypereutrophic lake in Burleigh County, North Dakota with an estimated average depth of about 12 feet.
Source: EPA Water Quality Portal sampling records, NDDEQ, last sampled 2020-06-09. Grade methodology: LakeGrade methodology.
Watch Long Lake water quality
Subscribe for LakeQuality updates by email. No spam, unsubscribe anytime.
Swimming Safety
Not rated for swimming — there is not enough monitoring data to judge this lake
Water Quality Grade: Not rated
No clarity data. Phosphorus level: 420 µg/L. Trophic State Index: 91.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | No data | |
| Phosphorus | 420 µg/L | |
| Chlorophyll-a (Algae) | No data | |
| Trophic State Index (TSI) | 91 | Hypereutrophic |
Very high nutrients, dense algae, poor clarity
Lake Details
| Characteristic | Value |
|---|---|
| Average Depth | ~12 ft est. |
Depth marked “est.” is a modeled estimate from HydroLAKES, not a measured survey. North Dakota has not published bathymetry for Long Lake.
Where to stay near Long Lake
Compare lakeside cabins, hotels, and vacation rentals near Long Lake in Burleigh County, North Dakota — live availability and prices for your trip. Switch the map to Satellite to see the lake and how close each stay is to the water.
Top-rated places to stay near Long Lake
Availability and prices from Stay22 partners (Booking.com, Vrbo, Expedia). We may earn a commission from bookings, at no extra cost to you.
Planning a trip to Long Lake?
Get lake water-quality report cards plus the best cabin & lodging deals near Long Lake — straight to your inbox. No spam, unsubscribe anytime.
Planning a whole trip? See where to stay at North Dakota’s top lakes →
Fishing Long Lake
Location
Nearby Lakes in Burleigh County
Explore Long Lake across LakeGrade
Species activity outlook by water temperature and season
Where to stay at North Dakota's top lakes, each with its grade
Very high nutrients, dense algae, poor clarity
North Dakota's cleanest and most-polluted lakes, ranked
More North Dakota Lake Rankings
Other Lakes in North Dakota
Hypereutrophic Lakes in North Dakota
More records, surveys & data sources
Lake Size & Watershed
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.
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)
Grade thresholds come from the U.S. EPA National Lakes Assessment 2022 Technical Support Document (EPA 841-R-24-006, Table 6-3), applied by ecoregion. See how grades are calculated.
Data Sources
Water quality data from the EPA Water Quality Portal
Lake size & watershed from HydroLAKES (HydroSHEDS)
Grade thresholds from the EPA National Lakes Assessment (EPA 841-R-24-006, Table 6-3), applied by ecoregion
Depth, fish, and access data from North Dakota Game & Fish
Most recent sample: 2020-06-09
Monitoring stations: 1