Lucy Lake
Lucy Lake in Carver County, Minnesota has a water quality grade of D (Nutrient-rich). Water clarity: 3.9 ft visibility. Phosphorus: 62 µg/L. Chlorophyll-a (algae): 20.7 µg/L. Maximum depth: 20 ft. Surface area: 87.53 acres.
- Clarity
- 3.9 ft
- Typical in August
- 70°F
- Max depth
- 20 ft
- Area
- 88 acres
- Type
- Eutrophic
- Trend
- ↓ Declining
- Public access
- No
Grade D measures nutrients and algae, not whether this is a good place for a cabin trip. Cabins and rentals near Lucy Lake →
Next lake in Carver County
Lucy Lake is a 88-acre productive, nutrient-rich eutrophic lake in Carver County, Minnesota with a maximum depth of 20 feet. Water quality is graded D based on 2 sampling years through 2025. Overall water quality is declining over recent sampling years. The lake supports 9 documented fish species including black bullhead, black crappie, and bluegill. No public access — the lake is private or restricted. Compared to the 37 other monitored lakes in Carver County, Lucy Lake ranks #15 for water quality.
Source: EPA Water Quality Portal sampling records, Minnesota DNR LakeFinder, last sampled 2025-09-15. Grade methodology: LakeGrade methodology.
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Swimming Safety
Grade onlyAlgae risk
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.
Nutrients and algae run higher than average — check local advisories before swimming, and skip the water if you see scum
Water Quality Grade: D (Nutrient-rich)
Murky, only visible to about 3.9 ft. Phosphorus level: 62 µg/L. Chlorophyll-a: 20.7 µg/L. Trophic State Index: 60.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 3.9 ft | Not graded |
| Phosphorus | 62 µg/L | Poor |
| Chlorophyll-a (Algae) | 20.7 µg/L | Poor |
| Trophic State Index (TSI) | 60 | Eutrophic |
High nutrients, frequent algae, reduced clarity
Where to stay near Lucy Lake
Compare lakeside cabins, hotels, and vacation rentals near Lucy Lake in Carver 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. The water-quality grade measures nutrients and algae, not lodging — cabins and rentals around Lucy Lake are listed below.
Top-rated places to stay near Lucy Lake
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Planning a whole trip? See where to stay at Minnesota’s top lakes →
Water Temperature
Lucy Lake typically sits around 70°F at the surface in August. Summer average is about 69°F. Usually warmest in Jul (about 70°F) and coldest in Jan (about 37°F). These are typical values by month — not a live reading.
Typical surface water temperature by month, from 582 field readings (2010–2025) via the EPA Water Quality Portal. See the full Lucy Lake water temperature breakdown →
Lake Details
| Characteristic | Value |
|---|---|
| Maximum Depth | 20 ft |
| Surface Area | 88 acres |
| Shoreline Length | 2.3 mi |
| Littoral Zone | 98% |
| Public Access | No |
Lake Size & Watershed
Size, shoreline, and watershed area from HydroLAKES (HydroSHEDS).
Fish Species
Click a species to see every graded lake where it is documented.
Fishing Lucy 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.
DNR Fisheries Survey Summary
3 surveys on file from MN DNR Fisheries. Most recent: 2012-06-13 (Standard Survey).
Top Species by Catch Rate
| Species | Avg CPUE | Avg Weight |
|---|---|---|
| Bluegill | 34.12 | 0.2 lb |
| Pumpkinseed | 18.51 | 0.09 lb |
| Yellow Bass | 7.30 | 0.45 lb |
| Northern Pike | 6.54 | 2.41 lb |
| Black Bullhead | 4.20 | 0.67 lb |
| Hybrid Sunfish | 2.82 | 0.25 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.
Bluegill
Pumpkinseed
Yellow Bass
Northern Pike
From the 2012-06-13 survey
Lucy is a small, productive, 92-acre lake located in Chanhassen, Carver County. The lake has been subject to periodic partial winterkills, and, as a result, fish populations have fluctuated, at times dramatically. Most recently, oxygen was low enough in the winter of 2010-11 to induce another partial winterkill.…
DNR Reports & Resources
Minnesota DNR LakeFinder publishes lake survey, fish stocking, water access, and aquatic plant data for Lucy Lake. 1 report on file.
These links open on the official state DNR websites (Wisconsin DNR survey PDFs · Minnesota DNR LakeFinder).
- —Fisheries Lake Survey — LucyFisheries Lake Survey · MN DNR LakeFinder
Water Quality Trend: ↓ Declining
Based on 6 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Water Clarity | ↓ Declining | -0.257 m/yr | 6 |
| Phosphorus | ↓ Declining | +6.69 µg/L/yr | 5 |
| Chlorophyll-a | ↓ Declining | +3.11 µg/L/yr | 5 |
EPA Impairment Status
Lucy 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 MN10-0007-00 · Official waterbody report
County Ranking
Ranked #15 of 38 lakes in Carver County
Nearby Lakes With Higher Grades
Lucy Lake holds Grade D. 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 Carver County
Frequently asked questions about Lucy Lake
What is the water quality grade for Lucy Lake?
- Lucy Lake in Carver County, Minnesota has a water quality grade of D (Nutrient-rich). Water clarity: 3.9 ft visibility. Phosphorus: 62 µg/L. Chlorophyll-a (algae): 20.7 µg/L. Maximum depth: 20 ft. Surface area: 87.53 acres.
Is Lucy Lake safe to swim in?
- Nutrients and algae run higher than average — check local advisories before swimming, and skip the water if you see scum. Lucy Lake has a water quality grade of D (Nutrient-rich). Algae concentration (chlorophyll-a) is 20.7 µg/L. Always check local health department advisories before swimming.
What is the water temperature of Lucy Lake?
- Lucy Lake typically sits around 70°F at the surface in August, from 582 EPA Water Quality Portal field readings (2010–2025). That is a typical value for the month, not a live reading.
How deep is Lucy Lake?
- Lucy Lake has a maximum depth of 20 feet. The lake covers 87.53 acres.
What fish are in Lucy Lake?
- Fish species found in Lucy Lake include black bullhead, black crappie, bluegill, common carp, hybrid sunfish, northern pike, pumpkinseed, yellow bullhead, yellow perch. Lucy Lake is located in Carver County, Minnesota.
Explore Lucy Lake across LakeGrade
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Where this data comes from
295 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
MNPCA295 samples · 2020–2025
Analytical methods
- Field measurement/observation, generic method
- Phosphorus by Two Reagent Colorimetry
- Phosphorus by Colorimetry
- Analysis of Chlorophyll in Periphyton and Plankton
- 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 size & watershed from HydroLAKES (HydroSHEDS)
Lake details from Minnesota DNR LakeFinder