Round Lake
Round Lake in Hennepin County, Minnesota has a water quality grade of C (Fair). Water clarity: 6.6 ft visibility. Phosphorus: 39 µg/L. Chlorophyll-a (algae): 14 µg/L. Maximum depth: 37 ft. Surface area: 30.73 acres.
- Clarity
- 6.6 ft
- Typical in August
- 60°F
- Max depth
- 37 ft
- Area
- 31 acres
- Type
- Eutrophic
- Trend
- ↓ Declining
- Public access
- Yes
Next lake in Hennepin County
Round Lake is a 31-acre productive, nutrient-rich eutrophic lake in Hennepin County, Minnesota with a maximum depth of 37 feet. Water quality is graded C based on 2 sampling years through 2025. Overall water quality is declining over recent sampling years. The lake supports 8 documented fish species including black bullhead, black crappie, and bluegill. Public access is available with 1 public boat landing. Compared to the 80 other monitored lakes in Hennepin County, Round Lake ranks #8 for water quality.
Source: EPA Water Quality Portal sampling records, Minnesota DNR LakeFinder, last sampled 2025-02-06. Grade methodology: LakeGrade methodology.
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Swimming Safety
Grade onlyModerate
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.
Generally safe for swimming, moderate water quality
Water Quality Grade: C (Fair)
Murky, only visible to about 6.6 ft. Phosphorus level: 39 µg/L. Chlorophyll-a: 14 µg/L. Trophic State Index: 54.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 6.6 ft | Not graded |
| Phosphorus | 39 µg/L | Fair |
| Chlorophyll-a (Algae) | 14 µg/L | Fair |
| Trophic State Index (TSI) | 54 | Eutrophic |
High nutrients, frequent algae, reduced clarity
Where to stay near Round Lake
Compare lakeside cabins, hotels, and vacation rentals near Round Lake in Hennepin 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 60°F at the surface in August. Summer average is about 59°F. Usually warmest in Jul (about 60°F) and coldest in Jan (about 39°F). These are typical values by month — not a live reading.
Typical surface water temperature by month, from 516 field readings (2010–2025) via the EPA Water Quality Portal. See the full Round Lake water temperature breakdown →
Lake Details
| Characteristic | Value |
|---|---|
| Maximum Depth | 37 ft |
| Surface Area | 31 acres |
| Shoreline Length | 0.8 mi |
| Littoral Zone | 75% |
| Public Access | Yes |
Recreation & Access
- Round LakePublic
Fish Species
Click a species to see every graded lake where it is documented.
Fishing Round 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.
DNR Fisheries Survey Summary
14 surveys on file from MN DNR Fisheries. Most recent: 2025-05-30 (Standard Survey).
Top Species by Catch Rate
| Species | Avg CPUE | Avg Weight |
|---|---|---|
| Largemouth Bass | 176.05 | 0.53 lb |
| Bluegill | 97.59 | 0.16 lb |
| Walleye | 6.84 | 1.54 lb |
| Pumpkinseed | 2.74 | 0.22 lb |
| Yellow Bass | 1.92 | 0.69 lb |
| Hybrid Sunfish | 1.79 | 0.24 lb |
CPUE = catch per unit effort, averaged across surveys (excludes juvenile shoreline seining). Higher CPUE = more abundant in standardized sampling.
Length Distributions
Number of fish caught at each inch class in the most recent survey that recorded lengths. Red dashed line marks an approximate trophy threshold for that species.
Largemouth Bass
Bluegill
Walleye
Pumpkinseed
From the 2025-05-30 survey
Round Lake is a small (33-acre) bowl-shaped lake, with a maximum depth of 37 feet. Round is located within the city of Eden Prairie, which owns parkland surrounding the entire lake. In addition to a boat ramp, there is a fishing pier for anglers. Boaters may use electric motors only. Bluegill Sunfish are the dominant…
DNR Reports & Resources
Minnesota DNR LakeFinder publishes lake survey, fish stocking, water access, and aquatic plant data for Round Lake. 2 reports on file.
These links open on the official state DNR websites (Wisconsin DNR survey PDFs · Minnesota DNR LakeFinder).
- —Fisheries Lake Survey — RoundFisheries Lake Survey · MN DNR LakeFinder
- —Public Water Access Sites — RoundPublic Water Access Sites · MN DNR LakeFinder
Water Quality Trend: ↓ Declining
Based on 5 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Water Clarity | ↓ Declining | -0.061 m/yr | 5 |
| Phosphorus | ↓ Declining | +0.82 µg/L/yr | 5 |
| Chlorophyll-a | ↑ Improving | -0.78 µg/L/yr | 5 |
EPA Impairment Status
Round Lake is officially listed as impaired under Clean Water Act §303(d) in the 2024 EPA reporting cycle (IR category 4A).
Causes of impairment
A Total Maximum Daily Load (TMDL) plan has been approved.
Source: EPA ATTAINS assessment unit MN27-0071-00 · Official waterbody report
County Ranking
Ranked #8 of 81 lakes in Hennepin County
Nearby Lakes With Higher Grades
Round Lake holds Grade C. One nearby lake has a higher nutrient-and-algae grade — useful for a swim day, not a reason to skip lodging here.
See full comparison →Nearby Lakes in Hennepin County
Frequently asked questions about Round Lake
What is the water quality grade for Round Lake?
- Round Lake in Hennepin County, Minnesota has a water quality grade of C (Fair). Water clarity: 6.6 ft visibility. Phosphorus: 39 µg/L. Chlorophyll-a (algae): 14 µg/L. Maximum depth: 37 ft. Surface area: 30.73 acres.
Is Round Lake safe to swim in?
- Generally safe for swimming, moderate water quality. Round Lake has a water quality grade of C (Fair). Algae concentration (chlorophyll-a) is 14 µg/L. Always check local health department advisories before swimming.
What is the water temperature of Round Lake?
- Round Lake typically sits around 60°F at the surface in August, from 516 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 37 feet. The lake covers 30.73 acres.
What fish are in Round Lake?
- Fish species found in Round Lake include black bullhead, black crappie, bluegill, hybrid sunfish, largemouth bass, northern pike, pumpkinseed, yellow bullhead. Round Lake is located in Hennepin County, Minnesota.
Are there boat ramps on Round Lake?
- Round Lake has 1 documented boat landing in the USGS National Boat Ramps inventory. Named access points include Round Lake. Public access is listed as yes.
Explore Round Lake across LakeGrade
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Where this data comes from
352 measurements from 1 monitoring station, 2020–2025. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- Minnesota Pollution Control Agency - Ambient Surface Water
MNPCA352 samples · 2020–2025
Analytical methods
- Field measurement/observation, generic method
- Phosphorus by Two Reagent Colorimetry
- Analytical procedure not specified
- 10200 H ~ Chlorophyll a-b-c Determination
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
Impairment status from EPA ATTAINS 303(d) database
Lake details from Minnesota DNR LakeFinder
Named boat-access points from the USGS National Boat Ramps inventory