Dion Lake is a 90-acre mesotrophic lake in Rolette County, North Dakota with a maximum depth of 20 feet (10-foot average). Water quality is graded C based on 1 sampling years through 2025. The lake supports 4 documented fish species including Walleye, Yellow Perch, and Northern Pike. Public access is available with 1 public boat landing. Compared to the 13 other monitored lakes in Rolette County, Dion Lake ranks #8 for water quality.
Source: EPA Water Quality Portal sampling records, North Dakota DNR, last sampled 2025-10-01. Grade methodology: LakeGrade methodology.
Watch Dion Lake water quality
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Swimming Safety
Generally safe for swimming, moderate water quality
Water Quality Grade: C, Fair
Moderate clarity, visible to about 8.5 ft. Trophic State Index: 46.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 8.5 ft | C |
| Phosphorus | No data | |
| Chlorophyll-a (Algae) | No data | |
| Trophic State Index (TSI) | 46 | Mesotrophic |
Moderate nutrients, good water quality
Lake Details
| Characteristic | Value |
|---|---|
| Maximum Depth | 20.1 ft |
| Average Depth | 10.2 ft |
| Surface Area | 90 acres |
| Shoreline Length | 2 mi |
| Public Access | Yes |
Where to stay near Dion Lake
Compare lakeside cabins, hotels, and vacation rentals near Dion Lake in Rolette 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.
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Fish Species
Click a species to see every graded lake where it is documented.
Fishing Dion Lake
Invasive & Introduced Species
Red chips are ecologically harmful invasive species. Gray chips are stocked or introduced fish that aren't a current ecological concern.
Source: USGS Nonindigenous Aquatic Species (NAS) Database. Hover a chip to see scientific name, ecological context, status, and first-observed year.
Recreation & Access
Water Temperature
Dion Lake averages about 65°F at the surface in summer, usually warmest in Jun (about 68°F) and coldest in Sep (about 51°F). These are typical values by month — not a live reading.
Typical surface water temperature by month, from 17 field readings (2016–2025) via the EPA Water Quality Portal. See the full Dion Lake water temperature breakdown →
Location
County Ranking
Ranked #8 of 14 lakes in Rolette County
Cleaner Lakes Within 30 Miles
Dion Lake holds Grade C. 4 nearby lakes hold higher grades.
Nearby Lakes in Rolette County
Explore Dion 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
Moderate nutrients, good water quality
North Dakota's cleanest and most-polluted lakes, ranked
More North Dakota Lake Rankings
Other Grade C Lakes in North Dakota
Mesotrophic Lakes in North Dakota
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
Public boat-access points from the USGS National Boat Ramps inventory
Most recent sample: 2025-10-01
Monitoring stations: 1