Where is Ellwood Lake?

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

What is the water temperature of Ellwood Lake?

Ellwood Lake typically sits around 75°F at the surface in August, from 18 EPA Water Quality Portal field readings (2024–2025). That is a typical value for the month, not a live reading.

How deep is Ellwood Lake?

Ellwood Lake has a maximum depth of 25 feet. The lake covers 130 acres.

What fish are in Ellwood Lake?

Fish species found in Ellwood Lake include Panfish, Largemouth Bass, Smallmouth Bass, Northern Pike. Ellwood Lake is located in Florence County, Wisconsin.

Are there boat ramps on Ellwood Lake?

Ellwood Lake has 1 documented boat landing in the USGS National Boat Ramps inventory. Named access points include Ellwood Lake. Public access is listed as yes.

Can I fish at Ellwood Lake?

Ellwood 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 Wisconsin's fish and wildlife agency, so check its current regulations before you go.

Ellwood Lake

Florence County, Wisconsin130 acresView map Directions

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

Clarity

13 ft

Clearer than most

Secchi · sampled 2026

Phosphorus

12 µg/L

Less phosphorus than most

Measured by Wisconsin DNR

Water temp

~75°F

Typical for Aug · EPA WQP

Max depth

25 ft

Bathymetric survey

Area

130 acres

Surface area

Type

Mesotrophic

Trophic class

Mesotrophic
2 aquatic invasives
25 ft max depth
Public access

See the measurements Directions Where to stay

Ellwood Lake in Florence County, Wisconsin has water-quality measurements published by Wisconsin DNR, shown here as reported. Water clarity: 13 ft visibility. Phosphorus: 12 µg/L. Maximum depth: 25 ft. Surface area: 130 acres.

Wisconsin DNR lists Panfish as common on Ellwood Lake. DNR survey details →

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Ellwood Lake is a 130-acre mesotrophic lake in Florence County, Wisconsin with a maximum depth of 25 feet. Overall water quality is improving over recent sampling years. The lake supports 4 documented fish species including Panfish, Largemouth Bass, and Smallmouth Bass. Public access is available with 1 public boat landing. Compared to the 11 other monitored lakes in Florence County, Ellwood Lake ranks #7 for water quality.

Source: EPA Water Quality Portal sampling records, Wisconsin DNR Surface Water, last sampled 2026-06-20. Methodology: how these readings are compared.

What Ellwood Lake is good for

From access and monitoring records, not editorial picks.

Clear water13 ft of visibility
Boat launch1 documented ramp
Fishing4 species recorded

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 Ellwood Lake 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 Eagle River →

Get alerts for Ellwood Lake →

Water quality measurements for Ellwood Lake

These are the measurements Wisconsin DNR publishes for Ellwood Lake, 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 13 ft. Phosphorus 12 µg/L. TSI 40.

Water quality readings
Measure	Reading	Where it sits
Water clarity (Secchi depth)	13ft	Measured, not scored How deep a black-and-white disk stays visible from the surface. Higher is clearer.
Total phosphorus	12µg/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 Ellwood Lake

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

Water Temperature

Ellwood Lake typically sits around 75°F at the surface in August. Summer average is about 74°F. Usually warmest in Jul (about 76°F) and coldest in Jun (about 72°F). These are typical values by month — not a live reading.

Jan

Feb

Mar

Apr

May

72°

Jun

76°

Jul

75°

Aug

Sep

Oct

Nov

Dec

Column height runs from this lake’s coldest month (72°F) to its warmest (76°F).

Typical surface water temperature by month, from 18 field readings (2024–2025) via the EPA Water Quality Portal. See the full Ellwood Lake water temperature breakdown →

DNR fisheries survey

Wisconsin DNR lists Panfish as common on Ellwood Lake.

A DNR fisheries survey reports fish abundance and catch rates, not water quality. LakeQuality shows Ellwood Lake’s water-quality measurements separately, and the water-quality trend over 7 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 1994. 4 stations on file (most recent sample 2025).

DNR Assessment

Good · Deep Seepage lake

Trophic State Index 45 (mesotrophic) · 5-year average

Fish Species (DNR-rated)

Panfish(Common)Smallmouth Bass(Common)Largemouth Bass(Present)Northern Pike(Present)

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

DNR Reports & Resources

Wisconsin DNR Fisheries scientists publish multi-year survey reports for Ellwood Lake covering fish populations, stocking, water quality, and management. 1 report on file.

These links open on the official state DNR websites (Wisconsin DNR survey PDFs · Minnesota DNR LakeFinder).

2022
Ellwood Lake shocking and netting survey, 2022
Netting Survey · WI DNR · 2022 (PDF)

Lake Details

Max depth

25 ft

Surface area

130 acres

Public access

Yes

Listed by Wisconsin DNR

Lake Size & Watershed

Watershed (drainage) area

1 sq mi

HydroLAKES / HydroSHEDS

Shoreline

2 mi

HydroLAKES / HydroSHEDS

Elevation

1,115 ft

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

Recreation & Access

Boat Landings

Yes

Public Access

Ellwood 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 Ellwood Lake

Compare lakeside cabins, hotels, and vacation rentals near Ellwood Lake in Florence 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 Ellwood Lake

Prices for Oct 9–11, 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 Ellwood Lake’s readings

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Fish Species

Panfish Largemouth Bass Smallmouth Bass Northern Pike

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

Fishing Ellwood 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.

Banded Mystery SnailEurasian Water-MilfoilHybrid Eurasian / Northern Water-MilfoilRusty CrayfishZebra Mussel

Water Quality Trend: Improving

Based on 7 years of monitoring (2020–2026).

Water clarity
Improving
6 years
Phosphorus
Stable
+0.11 µg/L/yr7 years

See year-by-year chart →

Nearby Lakes in Florence County

Bass Lake12 ft clear · Mesotrophic—View →Frog Lake—View →Frog Lake9.5 ft clear · Mesotrophic—View →Lake Anna20.5 ft clear—View →West Lake -Spread Eagle Chain9.5 ft clear—View →Cosgrove Lake9.4 ft clear—View →

Frequently asked questions about Ellwood Lake

Where is Ellwood Lake?: Ellwood Lake is a lake in Florence County, Wisconsin. Its water-quality measurements are published by Wisconsin DNR and shown on this page as reported.
What is the water quality of Ellwood Lake?: Ellwood Lake in Florence County, Wisconsin has water-quality measurements published by Wisconsin DNR, shown here as reported. Water clarity: 13 ft visibility. Phosphorus: 12 µg/L. Maximum depth: 25 ft. Surface area: 130 acres.
Is Ellwood Lake safe to swim in?: Nutrient and algae readings are not a swimming clearance. Check local advisories before you swim.
What is the water temperature of Ellwood Lake?: Ellwood Lake typically sits around 75°F at the surface in August, from 18 EPA Water Quality Portal field readings (2024–2025). That is a typical value for the month, not a live reading.
How deep is Ellwood Lake?: Ellwood Lake has a maximum depth of 25 feet. The lake covers 130 acres.
What fish are in Ellwood Lake?: Fish species found in Ellwood Lake include Panfish, Largemouth Bass, Smallmouth Bass, Northern Pike. Ellwood Lake is located in Florence County, Wisconsin.
What did the DNR fisheries survey find at Ellwood Lake?: Wisconsin DNR lists Panfish as common on Ellwood Lake. A DNR fisheries survey reports fish abundance and catch rates, not water quality. LakeQuality shows Ellwood Lake’s water-quality measurements separately, and the water-quality trend over 7 years of monitoring is improving. Catch rate is not a swim clearance and is not a weekly bite report.
Are there boat ramps on Ellwood Lake?: Ellwood Lake has 1 documented boat landing in the USGS National Boat Ramps inventory. Named access points include Ellwood Lake. Public access is listed as yes.
Can I fish at Ellwood Lake?: Ellwood 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 Wisconsin's fish and wildlife agency, so check its current regulations before you go.

Explore Ellwood Lake across LakeQuality

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Mesotrophic Lakes in Wisconsin

Hilbert Lake Shannon Lake Smith Lake Oneonta Lake

Where this data comes from

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

Collected and reported by

Wisconsin Department of Natural ResourcesWIDNR_WQX51 samples · 2020–2026

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.

Other records on this page

Lake size & watershed from HydroLAKES (HydroSHEDS)

Fish and recreation data from Wisconsin DNR Lakes

Named boat-access points from the USGS National Boat Ramps inventory