Round Lake
Round Lake in Beltrami County, Minnesota has a water quality grade of A (Excellent). Water clarity: 18 ft visibility. Phosphorus: 7 µg/L. Chlorophyll-a (algae): 1.9 µg/L. Maximum depth: 38 ft. Surface area: 181.06 acres.
- Clarity
- 18 ft
- Typical in August
- 74°F
- Max depth
- 38 ft
- Area
- 181 acres
- Type
- Oligotrophic
- Trend
- ↑ Improving
- Public access
- No
Next lake in Beltrami County
Round Lake is a 181-acre cold, clear oligotrophic lake in Beltrami County, Minnesota with a maximum depth of 38 feet. Water quality is graded A based on 2 sampling years through 2025. Overall water quality is improving over recent sampling years. Limited fish-species data available. No public access — the lake is private or restricted. Compared to the 84 other monitored lakes in Beltrami County, Round Lake ranks #3 for water quality.
Source: EPA Water Quality Portal sampling records, Minnesota DNR LakeFinder, last sampled 2025-09-17. Grade methodology: LakeGrade methodology.
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Swimming Safety
Grade onlyLow algae
Based on clarity and algae grades from past sampling — we do not hold live water temperature and a current cyanobacteria reading for this lake. Check your state or county health department before you swim.
Excellent for swimming, crystal clear water with minimal algae
Water Quality Grade: A (Excellent)
Crystal clear, you can see 18 ft down. Phosphorus level: 7 µg/L. Chlorophyll-a: 1.9 µg/L. Trophic State Index: 35.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 18 ft | Not graded |
| Phosphorus | 7 µg/L | Good |
| Chlorophyll-a (Algae) | 1.9 µg/L | Good |
| Trophic State Index (TSI) | 35 | Oligotrophic |
Low nutrients, clear water, excellent for swimming
Where to stay near Round Lake
Compare lakeside cabins, hotels, and vacation rentals near Round Lake in Beltrami County, Minnesota — 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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Water Temperature
Round Lake typically sits around 74°F at the surface in August. Summer average is about 73°F. Usually warmest in Jul (about 75°F) and coldest in Jan (about 32°F). These are typical values by month — not a live reading.
Typical surface water temperature by month, from 75 field readings (2010–2025) via the EPA Water Quality Portal. See the full Round Lake water temperature breakdown →
Lake Details
| Characteristic | Value |
|---|---|
| Maximum Depth | 38 ft |
| Surface Area | 181 acres |
| Shoreline Length | 2.2 mi |
| Littoral Zone | 30% |
| Public Access | No |
Lake Size & Watershed
Size, shoreline, and watershed area from HydroLAKES (HydroSHEDS).
Fishing Round Lake
DNR Fisheries Survey Summary
1 survey on file from MN DNR Fisheries. Most recent: 1979-08-29 (Standard Survey).
Top Species by Catch Rate
| Species | Avg CPUE | Avg Weight |
|---|---|---|
| Rock Bass | 12.25 | 0.1 lb |
| Yellow Perch | 8.75 | 0.12 lb |
| White Sucker | 8.00 | 0.98 lb |
| Pumpkinseed | 7.88 | 0.15 lb |
| Bluegill | 6.25 | 0.08 lb |
| Largemouth Bass | 6.13 | 0.67 lb |
CPUE = catch per unit effort, averaged across surveys (excludes juvenile shoreline seining). Higher CPUE = more abundant in standardized sampling.
From the 1979-08-29 survey
Walleye, Yel Perch and N Pike pop. are about 1/2 of the cty mean and only lrg sized fish were capt. The LM Bass pop. is about 20 times lrgr than the cty mean. Bluegill and Pumpkinseed pop.s are 6 & 9 times respectively lrgr than the cty mean. The Rock Bass pop. is 8 times larger than the cty mean
DNR Reports & Resources
Minnesota DNR LakeFinder publishes lake survey, fish stocking, water access, and aquatic plant data for Round Lake. 1 report on file.
These links open on the official state DNR websites (Wisconsin DNR survey PDFs · Minnesota DNR LakeFinder).
- —Fisheries Lake Survey — SylviaFisheries Lake Survey · MN DNR LakeFinder
Water Quality Trend: ↑ Improving
Based on 6 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Water Clarity | → Stable | +0.25 m/yr | 6 |
| Phosphorus | ↑ Improving | -0.49 µg/L/yr | 6 |
| Chlorophyll-a | ↑ Improving | -0.11 µg/L/yr | 6 |
County Ranking
Ranked #3 of 85 lakes in Beltrami County
Nearby Lakes in Beltrami County
Frequently asked questions about Round Lake
What is the water quality grade for Round Lake?
- Round Lake in Beltrami County, Minnesota has a water quality grade of A (Excellent). Water clarity: 18 ft visibility. Phosphorus: 7 µg/L. Chlorophyll-a (algae): 1.9 µg/L. Maximum depth: 38 ft. Surface area: 181.06 acres.
Is Round Lake safe to swim in?
- Excellent for swimming, crystal clear water with minimal algae. Round Lake has a water quality grade of A (Excellent). Algae concentration (chlorophyll-a) is 1.9 µg/L. Always check local health department advisories before swimming.
What is the water temperature of Round Lake?
- Round Lake typically sits around 74°F at the surface in August, from 75 EPA Water Quality Portal field readings (2010–2025). That is a typical value for the month, not a live reading.
How deep is Round Lake?
- Round Lake has a maximum depth of 38 feet. The lake covers 181.06 acres.
Explore Round Lake across LakeGrade
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Where this data comes from
98 measurements from 1 monitoring station, 2020–2025. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- Red Lake DNR
REDLAKE_WQX98 samples · 2020–2025
Analytical methods
- Phosphorus by Two Reagent Colorimetry
- 10200 H ~ Chlorophyll a-b-c Determination
- Turbidity by Nephelometry
Monitoring station identifiers (1)
Grade thresholds from the EPA National Lakes Assessment (EPA 841-R-24-006, Table 6-3), applied by ecoregion. See how grades are calculated and data sources.
Other records on this page
Lake size & watershed from HydroLAKES (HydroSHEDS)
Lake details from Minnesota DNR LakeFinder