Where is Big Moon Lake at?

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

How deep is Big Moon Lake at?

Big Moon Lake at has a maximum depth of 48 feet. The lake covers 187 acres.

What fish are in Big Moon Lake at?

Fish species found in Big Moon Lake at include Musky, Panfish, Largemouth Bass, Northern Pike, Walleye. Big Moon Lake at is located in Barron County, Wisconsin.

Can I fish at Big Moon Lake at?

Public access to Big Moon Lake at is listed as yes on the lake record. 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.

Big Moon Lake at

Barron County, Wisconsin187 acresView map Directions

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

Clarity

10 ft

Typical for Wisconsin

Secchi · sampled 2026

Phosphorus

23.3 µg/L

Typical for Wisconsin

Measured by Wisconsin DNR

Max depth

48 ft

Bathymetric survey

Area

187 acres

Surface area

Type

Mesotrophic

Trophic class

Trend

Stable

6 years of samples

Mesotrophic
Impaired · Nutrients (phosphorus, nitrogen)
Curly-Leaf Pondweed
48 ft max depth
Public access

See the measurements Directions Where to stay

Big Moon Lake at in Barron County, Wisconsin has water-quality measurements published by Wisconsin DNR, shown here as reported. Water clarity: 10 ft visibility. Phosphorus: 23.3 µg/L. Maximum depth: 48 ft. Surface area: 187 acres.

Wisconsin DNR lists Panfish as common on Big Moon Lake at. DNR survey details →

Loading map…

Big Moon Lake at is a 187-acre mesotrophic lake in Barron County, Wisconsin with a maximum depth of 48 feet. The lake supports 5 documented fish species including Musky, Panfish, and Largemouth Bass. Public access is available. Compared to the 27 other monitored lakes in Barron County, Big Moon Lake at ranks #14 for water quality.

Source: EPA Water Quality Portal sampling records, Wisconsin DNR Surface Water, last sampled 2026-06-29. Methodology: how these readings are compared.

What Big Moon Lake at is good for

From access and monitoring records, not editorial picks.

Clear water10 ft of visibility
Fishing5 species recorded
Deep water48 ft surveyed max depth

Swimming conditions

Readings only

Recreation use not supported

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. Big Moon Lake at is listed impaired under Clean Water Act §303(d) (IR 5R) for nutrients (phosphorus, nitrogen). Check local advisories before you swim.

Whether Big Moon Lake at 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 Eau Claire →

Get alerts for Big Moon Lake at →

Water quality measurements for Big Moon Lake at

These are the measurements Wisconsin DNR publishes for Big Moon Lake at, 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 10 ft. Phosphorus 23.3 µg/L. TSI 47.

Water quality readings
Measure	Reading	Where it sits
Water clarity (Secchi depth)	10ft	Measured, not scored How deep a black-and-white disk stays visible from the surface. Higher is clearer.
Total phosphorus	23.3µg/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.	47	Mesotrophic OligotrophicMesotrophicEutrophicHypereutrophic

Moderate nutrients, good water quality

Ask about Big Moon Lake at

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

DNR fisheries survey

Wisconsin DNR lists Panfish as common on Big Moon Lake at.

A DNR fisheries survey reports fish abundance and catch rates, not water quality. LakeQuality shows Big Moon Lake at’s water-quality measurements separately, and the water-quality trend over 6 years of monitoring is stable. 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 1999. 1 station on file (most recent sample 2025).

Fish Species (DNR-rated)

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

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

Lake Details

Max depth

48 ft

Surface area

187 acres

Public access

Yes

Listed by Wisconsin DNR

Lake Size & Watershed

Watershed (drainage) area

10 sq mi

HydroLAKES / HydroSHEDS

Shoreline

2.5 mi

HydroLAKES / HydroSHEDS

Elevation

1,158 ft

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

Stays via Stay22

Stays near Big Moon Lake at

Compare lakeside cabins, hotels, and vacation rentals near Big Moon Lake at in Barron 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 Big Moon Lake at

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 Big Moon Lake at’s readings

Email me when new measurements post for this lake. Updates stay free.

Or email

Fish Species

Musky Panfish Largemouth Bass Northern Pike Walleye

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

Fishing Big Moon Lake at

Invasive & Introduced Species

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

Chinese Mystery SnailCurly-Leaf Pondweed

Water Quality Trend: Stable

Based on 6 years of monitoring (2020–2026).

Water clarity
Stable
4 years
Phosphorus
Stable
+0.19 µg/L/yr6 years

See year-by-year chart →

Reservoir Info (USACE NID)

Big Moon Lake at is a man-made reservoir impounded by the Big Moon Lake (completed 1968), built primarily for recreation on the Moon Creek; earth-type dam, 9 ft tall and 500 ft long.

Surface area: 187 ac
Normal storage: 900 ac-ft
Max storage: 2,000 ac-ft
Drainage area: 7 sq mi
Hazard class: Low
Owner: Barron County

Source: USACE National Inventory of Dams, NID ID WI00486 · Operator website · Matched by proximity (0.38 km)

EPA Impairment Status

Big Moon Lake at is officially listed as impaired under Clean Water Act §303(d) in the 2024 EPA reporting cycle (IR category 5R).

Causes of impairment

Nutrients (phosphorus, nitrogen)

Designated uses not supporting: Aquatic life, Recreation.

Source: EPA ATTAINS assessment unit WI10004359 · Official waterbody report

Regulated Pollution Sources Nearby

1 EPA-permitted facility operate within about 5 miles of Big Moon Lake at under Clean Water Act (NPDES) discharge permits. 1 facility has a reported Clean Water Act violation in the past three years.

Almena Village Of
Almena · 1.1 mi away · NPDES WI0023183
Recent violation

Facilities permitted to discharge under the Clean Water Act within ~5 miles; proximity does not by itself mean a facility affects this lake. Source: EPA ECHO (ICIS-NPDES), as of 2026-07.

Nearby Lakes in Barron County

Little Moon Lake—View →Mud Lake—View →Lower Turtle Lake4 ft clear · Eutrophic—View →Musket Lake—View →Skinaway Lake—View →Upper Turtle Lake4 ft clear · Eutrophic—View →

Frequently asked questions about Big Moon Lake at

Where is Big Moon Lake at?: Big Moon Lake at is a lake in Barron County, Wisconsin. Its water-quality measurements are published by Wisconsin DNR and shown on this page as reported.
What is the water quality of Big Moon Lake at?: Big Moon Lake at in Barron County, Wisconsin has water-quality measurements published by Wisconsin DNR, shown here as reported. Water clarity: 10 ft visibility. Phosphorus: 23.3 µg/L. Maximum depth: 48 ft. Surface area: 187 acres.
Is Big Moon Lake at safe to swim in?: Nutrient and algae readings are not a swimming clearance. Big Moon Lake at is listed impaired under Clean Water Act §303(d) (IR 5R) for nutrients (phosphorus, nitrogen). Check local advisories before you swim.
How deep is Big Moon Lake at?: Big Moon Lake at has a maximum depth of 48 feet. The lake covers 187 acres.
What fish are in Big Moon Lake at?: Fish species found in Big Moon Lake at include Musky, Panfish, Largemouth Bass, Northern Pike, Walleye. Big Moon Lake at is located in Barron County, Wisconsin.
What did the DNR fisheries survey find at Big Moon Lake at?: Wisconsin DNR lists Panfish as common on Big Moon Lake at. A DNR fisheries survey reports fish abundance and catch rates, not water quality. LakeQuality shows Big Moon Lake at’s water-quality measurements separately, and the water-quality trend over 6 years of monitoring is stable. Catch rate is not a swim clearance and is not a weekly bite report.
Can I fish at Big Moon Lake at?: Public access to Big Moon Lake at is listed as yes on the lake record. 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 Big Moon Lake at across LakeQuality

Wisconsin Fishing Guide

Fish species and the cleanest lakes across Wisconsin

Barron County Fishing

Fish species and best lakes in Barron County

Lake Fishing Forecast

Species activity outlook by water temperature and season

Wisconsin Lake Trips

Where to stay at Wisconsin's top lakes, each with its readings

The State of Wisconsin's Lakes

Wisconsin's cleanest lakes, ranked on agency measurements

More lakes in Wisconsin

Clearest lakes in Wisconsin

Ranked by Secchi water clarity

All Wisconsin lakes

Every Wisconsin lake with its Wisconsin DNR measurements

Lake water quality by country

Official ratings and named-lake measurements

State Parks Near Big Moon Lake at

Straight Lake State Park

State Park · 23.2 mi

Other Lakes in Wisconsin

Horseshoe Lake

Polk County · 8.5 ft

Clear Lake

Polk County · 15.5 ft

Unnamed Lake

Polk County · 5 ft

Dace Lake

Polk County · Measured

Pipe Lake

Polk County · 11.5 ft

Mud Lake

Polk County · 4.3 ft

Mesotrophic Lakes in Wisconsin

Horseshoe Lake Dace Lake Pipe Lake Pike Lake

Where this data comes from

25 measurements from 1 monitoring station, 2020–2026. Retrieved from the EPA Water Quality Portal on 2026-08-02.

Collected and reported by

Wisconsin Department of Natural ResourcesWIDNR_WQX25 samples · 2020–2026

Analytical methods

Phosphorus by Colorimetry

Monitoring station identifiers (1)

WIDNR_WQX-033186

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

Regulated discharger data from EPA ECHO (ICIS-NPDES)

Lake size & watershed from HydroLAKES (HydroSHEDS)

Fish and recreation data from Wisconsin DNR Lakes