Round Lake
Hennepin County, Minnesota31 acresView mapDirections
Minnesota PCA publishes the water-quality measurements for Round Lake. Here is what has been measured.
- Eutrophic
- Impaired · Mercury
- Eurasian watermilfoil
- 37 ft max depth
- Public access
Round Lake in Hennepin County, Minnesota has water-quality measurements published by Minnesota PCA, shown here as reported. 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.
Minnesota DNR's Standard Survey on May 30, 2025 caught 0.50 northern pike per gill net at Round Lake. DNR survey details →
Round Lake is a 31-acre productive, nutrient-rich eutrophic lake in Hennepin County, Minnesota with a maximum depth of 37 feet. 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. Methodology: how these readings are compared.
What Round Lake is good for
From access and monitoring records, not editorial picks.
- Boat launch1 documented ramp
- Fishing8 species recorded
- Deep water37 ft surveyed max depth
Swimming conditions
Readings onlyModerate algae
Based on clarity and algae readings from past sampling — there is no live water temperature and a current cyanobacteria reading for this lake. Check your state or county health department before you swim.
Nutrient and algae readings are not a swimming clearance. Round Lake is listed impaired under Clean Water Act §303(d) (IR 4A) for mercury. Check local advisories before you swim.
Whether Round Lake is safe to swim in today is a call for the Minnesota Pollution Control Agency and the Minnesota DNR and the county health department, who post current advisories. LakeQuality does not issue swimming clearances.
Water quality measurements for Round Lake
These are the measurements Minnesota PCA publishes for Round Lake, shown as reported. The condition class beside each reading is the EPA National Lakes Assessment class for this lake’s ecoregion.
Murky, only visible to about 6.6 ft. Phosphorus 39 µg/L. Chlorophyll-a 14 µg/L. TSI 54.
| Measure | Reading | Where it sits |
|---|---|---|
| Water clarity (Secchi depth) | 6.6ft | Measured, not scored How deep a black-and-white disk stays visible from the surface. Higher is clearer. |
| Total phosphorus | 39µg/L | Fair GoodFairPoor |
| Chlorophyll-a (algae) | 14µg/L | Fair GoodFairPoor |
| Trophic state (TSI)Carlson's 0–100 index of how much algae a lake can support, from clarity, phosphorus and chlorophyll-a. | 54 | Eutrophic OligotrophicMesotrophicEutrophicHypereutrophic |
High nutrients, frequent algae, reduced clarity
Ask about Round Lake
Answers come straight from the public measurements and survey records on this page.
Water Temperature
Round Lake typically sits around 53°F at the surface in October. 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.
Column height runs from this lake’s coldest month (39°F) to its warmest (60°F).
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 →
Minnesota DNR's Standard Survey on May 30, 2025 caught 0.50 northern pike per gill net at Round Lake.
A DNR fisheries survey reports fish abundance and catch rates, not water quality. LakeQuality shows Round Lake’s water-quality measurements separately, and the water-quality trend over 5 years of monitoring is declining. Catch rate is not a swim clearance and is not a weekly bite report.
DNR Fisheries Survey Summary
14 surveys on file from MN DNR Fisheries. Most recent: 2025-05-30 (Standard Survey).
14 surveys on file · most recent 2025-05-30 (Standard Survey)
| Species | Catch rate (CPUE) | Size | Avg weight |
|---|---|---|---|
| Largemouth Bass | 176.05 | 5–10 in 2025-05-30 | 0.53 lb |
| Bluegill | 97.59 | 3–7 in 2025-05-30 | 0.16 lb |
| Walleye | 6.84 | 19–27 in 2000-06-05 | 1.54 lb |
| Pumpkinseed | 2.74 | 3–7 in 2025-05-30 | 0.22 lb |
| Yellow Bullhead | 1.92 | 8–12 in 2025-05-30 | 0.69 lb |
| Hybrid Sunfish | 1.79 | 6–7 in 2025-05-30 | 0.24 lb |
CPUE = catch per unit effort, fish caught per net per set in a standardised survey. It measures abundance, not size, and is not a weekly bite report.
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
Lake Details
Max depth
37 ft
Surface area
31 acres
Shoreline
0.8 mi
Littoral zone
75%
Share shallower than 15 ft
Public access
Yes
Listed by Minnesota PCA
Recreation & Access
- Round LakePublic
Named access points in the USGS National Boat Ramps inventory, within about 3 miles. More lakes with boat ramps
Stays via Stay22
Stays near Round Lake
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Top-rated places to stay near Round Lake
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Fish Species
Click a species to see every 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.
Water Quality Trend: Worsening
Based on 5 years of monitoring (2020–2025).
Water clarity
Worsening5 years
Phosphorus
Worsening+0.82 µg/L/yr5 years
Chlorophyll-a
Improving-0.78 µg/L/yr5 years
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
Designated uses not supporting: Fish consumption.
A Total Maximum Daily Load (TMDL) plan has been approved.
Source: EPA ATTAINS assessment unit MN27-0071-00 · Official waterbody report
Nearby Lakes in Hennepin County
Frequently asked questions about Round Lake
Where is Round Lake?
- Round Lake is a lake in Hennepin County, Minnesota. Its water-quality measurements are published by Minnesota PCA and shown on this page as reported.
What is the water quality of Round Lake?
- Round Lake in Hennepin County, Minnesota has water-quality measurements published by Minnesota PCA, shown here as reported. 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?
- Nutrient and algae readings are not a swimming clearance. Round Lake is listed impaired under Clean Water Act §303(d) (IR 4A) for mercury. Check local advisories before you swim.
What is the water temperature of Round Lake?
- Round Lake typically sits around 53°F at the surface in October, 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.
What did the DNR fisheries survey find at Round Lake?
- Minnesota DNR's Standard Survey on May 30, 2025 caught 0.50 northern pike per gill net at Round Lake. A DNR fisheries survey reports fish abundance and catch rates, not water quality. LakeQuality shows Round Lake’s water-quality measurements separately, and the water-quality trend over 5 years of monitoring is declining. Catch rate is not a swim clearance and is not a weekly bite report.
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.
Can I fish at Round Lake?
- Round Lake has 1 documented boat landing in the USGS National Boat Ramps inventory. Seasons, size and bag limits, and whether you need a license are set by Minnesota's fish and wildlife agency, so check its current regulations before you go.
Explore Round Lake across LakeQuality
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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)
EPA condition classes from the National Lakes Assessment (EPA 841-R-24-006, Table 6-3), applied by ecoregion. See where the data comes from 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