Lake Nancy is a lake in Washburn County, Wisconsin. Its water-quality measurements are published by Wisconsin DNR and shown on this page as reported.

How deep is Lake Nancy?

Lake Nancy has a maximum depth of 39 feet. The lake covers 757 acres.

Are there boat ramps on Lake Nancy?

Lake Nancy has 2 documented boat landings in the USGS National Boat Ramps inventory. Named access points include Nancy Lake, Lake Nancy. Public access is listed as yes.

Can I fish at Lake Nancy?

Lake Nancy has 2 documented boat landings in the USGS National Boat Ramps inventory. Seasons, size and bag limits, and whether you need a license are set by Wisconsin's fish and wildlife agency, so check its current regulations before you go.

Lake Nancy

Washburn County, Wisconsin757 acresView map Directions

Wisconsin DNR publishes the water-quality measurements for Lake Nancy. Here is what has been measured.

Clarity

14 ft

Clearer than most

Secchi · sampled 2025

Phosphorus

13.5 µg/L

Less phosphorus than most

Measured by Wisconsin DNR

Max depth

39 ft

Bathymetric survey

Area

757 acres

Surface area

Type

Mesotrophic

Trophic class

Trend

Improving

6 years of samples

Mesotrophic
2 aquatic invasives
39 ft max depth
Public access

See the measurements Directions Where to stay

Lake Nancy in Washburn County, Wisconsin has water-quality measurements published by Wisconsin DNR, shown here as reported. Water clarity: 14 ft visibility. Phosphorus: 13.5 µg/L. Maximum depth: 39 ft. Surface area: 757 acres.

Wisconsin DNR rates Panfish as abundant on Lake Nancy. DNR survey details →

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Lake Nancy is a 757-acre mesotrophic lake in Washburn County, Wisconsin with a maximum depth of 39 feet. Overall water quality is improving over recent sampling years. The lake supports 6 documented fish species including Musky, Panfish, and Largemouth Bass. Public access is available with 2 public boat landings. Compared to the 26 other monitored lakes in Washburn County, Lake Nancy ranks #15 for water quality.

Source: EPA Water Quality Portal sampling records, Wisconsin DNR Surface Water, last sampled 2025-08-17. Methodology: how these readings are compared.

Lake Nancy covers about 760 acres in Washburn County. It has 2 public boat landings, so a lakefront rental is not the only way to get a boat on the water. Vrbo is where to look for cabins and lake homes around Lake Nancy, and Booking.com and Expedia search hotels near the lake for your dates.

What Lake Nancy is good for

From access and monitoring records, not editorial picks.

Clear water14 ft of visibility
Boat launch2 documented ramps
Fishing6 species recorded
Deep water39 ft surveyed max depth

Swimming conditions

Readings only

Low 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. Check local advisories before you swim.

Whether Lake Nancy is safe to swim in today is a call for the Wisconsin Department of Natural Resources and the county health department, who post current advisories. LakeQuality does not issue swimming clearances.

Compare swimming lakes near Hayward →

Get alerts for Lake Nancy →

Water quality measurements for Lake Nancy

These are the measurements Wisconsin DNR publishes for Lake Nancy, shown as reported. The condition class beside each reading is the EPA National Lakes Assessment class for this lake’s ecoregion.

Good clarity, visible to about 14 ft. Phosphorus 13.5 µg/L. TSI 40.

Water quality readings
Measure	Reading	Where it sits
Water clarity (Secchi depth)	14ft	Measured, not scored How deep a black-and-white disk stays visible from the surface. Higher is clearer.
Total phosphorus	13.5µg/L	Good GoodFairPoor
Chlorophyll-a (algae)		No reading The green pigment in algae — a direct measure of how much algae is in the water.
Trophic state (TSI)Carlson's 0–100 index of how much algae a lake can support, from clarity, phosphorus and chlorophyll-a.	40	Mesotrophic OligotrophicMesotrophicEutrophicHypereutrophic

Moderate nutrients, good water quality

Ask about Lake Nancy

Answers come straight from the public measurements and survey records on this page.

DNR fisheries survey

Wisconsin DNR rates Panfish as abundant on Lake Nancy.

A DNR fisheries survey reports fish abundance and catch rates, not water quality. LakeQuality shows Lake Nancy’s water-quality measurements separately, and the water-quality trend over 6 years of monitoring is improving. Catch rate is not a swim clearance and is not a weekly bite report.

WI DNR Lake Profile

Authoritative data from the Wisconsin DNR LakePages. Monitored by volunteers since 2001. 4 stations on file (most recent sample 2025).

DNR Assessment

Excellent · Deep Seepage lake

Trophic State Index 39 (oligotrophic) · 5-year average

Fish Species (DNR-rated)

Panfish(Abundant)Largemouth Bass(Common)Northern Pike(Common)Walleye(Common)Musky(Present)Smallmouth Bass(Present)

Contour map (PDF) →Full WI DNR LakePage →Water quality stations →

Lake Details

Max depth

39 ft

Surface area

757 acres

Public access

Yes

Listed by Wisconsin DNR

Lake Size & Watershed

Watershed (drainage) area

5 sq mi

HydroLAKES / HydroSHEDS

Shoreline

9.5 mi

HydroLAKES / HydroSHEDS

Elevation

971 ft

Size, shoreline, and watershed area from HydroLAKES (HydroSHEDS).

Recreation & Access

Boat Landings

Yes

Public Access

Nancy LakePublic
Lake NancyPublic

Named access points in the USGS National Boat Ramps inventory, within about 3 miles. More lakes with boat ramps

Stays via Stay22

Stays near Lake Nancy

Compare lakeside cabins, hotels, and vacation rentals near Lake Nancy in Washburn County, Wisconsin — 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.

Top-rated places to stay near Lake Nancy

Prices for Oct 16–18, 4 adults. Change dates on the map below.

Availability and prices from Stay22 partners (Booking.com, Vrbo, Expedia). We may earn a commission from bookings, at no extra cost to you.

Planning a whole trip? See where to stay at Wisconsin’s top lakes →

Follow Lake Nancy’s readings

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Fish Species

Musky Panfish Largemouth Bass Smallmouth Bass Northern Pike Walleye

Click a species to see every lake where it is documented.

Fishing Lake Nancy

Invasive & Introduced Species

Red chips are ecologically harmful invasive species. Gray chips are stocked or introduced fish that aren't a current ecological concern.

Banded Mystery SnailChinese Mystery SnailCurly-Leaf PondweedEurasian Water-MilfoilPurple Loosestrife

Water Quality Trend: Improving

Based on 6 years of monitoring (2020–2025).

Water clarity
Stable
6 years
Phosphorus
Improving
-0.55 µg/L/yr6 years

See year-by-year chart →

Nearby Lakes in Washburn County

Banks Lake—View →Sherman Lake—View →Middle Twin Lake at7.5 ft clear—View →South Twin Lake14 ft clear · Oligotrophic—View →North Twin Lake9 ft clear · Mesotrophic—View →Lower Kimball Lake6 ft clear · Mesotrophic—View →

Frequently asked questions about Lake Nancy

Where is Lake Nancy?: Lake Nancy is a lake in Washburn County, Wisconsin. Its water-quality measurements are published by Wisconsin DNR and shown on this page as reported.
What is the water quality of Lake Nancy?: Lake Nancy in Washburn County, Wisconsin has water-quality measurements published by Wisconsin DNR, shown here as reported. Water clarity: 14 ft visibility. Phosphorus: 13.5 µg/L. Maximum depth: 39 ft. Surface area: 757 acres.
Is Lake Nancy safe to swim in?: Nutrient and algae readings are not a swimming clearance. Check local advisories before you swim.
How deep is Lake Nancy?: Lake Nancy has a maximum depth of 39 feet. The lake covers 757 acres.
What fish are in Lake Nancy?: Fish species found in Lake Nancy include Musky, Panfish, Largemouth Bass, Smallmouth Bass, Northern Pike, Walleye. Lake Nancy is located in Washburn County, Wisconsin.
What did the DNR fisheries survey find at Lake Nancy?: Wisconsin DNR rates Panfish as abundant on Lake Nancy. A DNR fisheries survey reports fish abundance and catch rates, not water quality. LakeQuality shows Lake Nancy’s water-quality measurements separately, and the water-quality trend over 6 years of monitoring is improving. Catch rate is not a swim clearance and is not a weekly bite report.
Are there boat ramps on Lake Nancy?: Lake Nancy has 2 documented boat landings in the USGS National Boat Ramps inventory. Named access points include Nancy Lake, Lake Nancy. Public access is listed as yes.
Can I fish at Lake Nancy?: Lake Nancy has 2 documented boat landings in the USGS National Boat Ramps inventory. Seasons, size and bag limits, and whether you need a license are set by Wisconsin's fish and wildlife agency, so check its current regulations before you go.

Explore Lake Nancy across LakeQuality

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Other Lakes in Wisconsin

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Douglas County · 15.3 ft

Whitefish Lake

Douglas County · 25 ft

Middle Mckenzie Lake

Burnett County · 20 ft

Rooney Lake

Burnett County · 11 ft

Saint Croix Flowage Lake

Douglas County · 10.5 ft

St Croix Flowage Lake

Douglas County · 6.8 ft

Mesotrophic Lakes in Wisconsin

Person Lake Bardon Lake Rooney Lake Webb Lake

Compare Lake Nancy With Nearby Lakes

Lake Nancy vs Long Lake

Washburn County · 9.5 ft

Where this data comes from

71 measurements from 2 monitoring stations, 2020–2025. Retrieved from the EPA Water Quality Portal on 2026-08-02.

Collected and reported by

Wisconsin Department of Natural ResourcesWIDNR_WQX71 samples · 2020–2025

Analytical methods

Phosphorus by Colorimetry

Monitoring station identifiers (2)

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.