Belcourt Inlet Lake is a 635-acre productive, nutrient-rich eutrophic lake in Rolette County, North Dakota with a maximum depth of 25 feet (11-foot average). Water quality is graded D based on 2 sampling years through 2025. Overall water quality is improving over recent sampling years. The lake supports 3 documented fish species including Northern Pike, Walleye, and Yellow Perch. Compared to the 13 other monitored lakes in Rolette County, Belcourt Inlet Lake ranks #11 for water quality.
Source: EPA Water Quality Portal sampling records, North Dakota DNR, last sampled 2025-09-16. Grade methodology: LakeGrade methodology.
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Swimming Safety
Swimming not recommended, poor water quality with high algae risk
Water Quality Grade: D, Poor
Very murky, less than 3.3 ft of visibility. Chlorophyll-a: 10.7 µg/L. Trophic State Index: 57.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 3.3 ft | F |
| Phosphorus | No data | |
| Chlorophyll-a (Algae) | 10.7 µg/L | C |
| Trophic State Index (TSI) | 57 | Eutrophic |
High nutrients, frequent algae, reduced clarity
Lake Details
| Characteristic | Value |
|---|---|
| Maximum Depth | 24.5 ft |
| Average Depth | 10.8 ft |
| Surface Area | 635 acres |
| Shoreline Length | 13.4 mi |
Where to stay near Belcourt Inlet Lake
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Fish Species
Click a species to see every graded lake where it is documented.
Fishing Belcourt Inlet Lake
Water Quality Trend: ↑ Improving
Based on 5 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Water Clarity | ↑ Improving | +0.17 m/yr | 5 |
| Chlorophyll-a | ↑ Improving | -0.53 µg/L/yr | 4 |
Water Temperature
Belcourt Inlet Lake averages about 69°F at the surface in summer, usually warmest in Jul (about 72°F) and coldest in May (about 57°F). These are typical values by month — not a live reading.
Typical surface water temperature by month, from 141 field readings (2010–2025) via the EPA Water Quality Portal.
Location
County Ranking
Ranked #11 of 14 lakes in Rolette County
Cleaner Lakes Within 30 Miles
Belcourt Inlet Lake holds Grade D. 2 nearby lakes hold higher grades.
- BGordon Center LakeRolette County · 2.5 mi · Two grade letters higher (D → B)
- BWheaton LakeRolette County · 2.6 mi · Two grade letters higher (D → B)
Nearby Lakes in Rolette County
Explore Belcourt Inlet Lake across LakeGrade
Fish species and top-graded lakes across North Dakota
Fish species and best lakes in Rolette County
Species activity outlook by water temperature and season
Where to stay at North Dakota's top lakes, each with its grade
High nutrients, frequent algae, reduced clarity
North Dakota's cleanest and most-polluted lakes, ranked
More North Dakota Lake Rankings
Other Grade D Lakes in North Dakota
Eutrophic Lakes in North Dakota
Compare Belcourt Inlet Lake With Nearby Lakes
More records, surveys & data sources
Lake Size & Watershed
Size, shoreline, and watershed area from HydroLAKES (HydroSHEDS). Mean depth is a modeled estimate.
Data Sources
Water quality data from the EPA Water Quality Portal
Lake size & watershed from HydroLAKES (HydroSHEDS)
Grading methodology based on Metropolitan Council standards
Depth, fish, and access data from North Dakota Game & Fish
Most recent sample: 2025-09-16
Monitoring stations: 1