Army Lake
Walworth County, Wisconsin80 acresView mapDirections
Wisconsin DNR publishes the water-quality measurements for Army Lake. Here is what has been measured.
- Mesotrophic
- Zebra Mussel
- 17 ft max depth
- Public access
- Limited data
Army Lake in Walworth County, Wisconsin has water-quality measurements published by Wisconsin DNR, shown here as reported. Water clarity: 8.2 ft visibility. Phosphorus: 11.7 µg/L. Maximum depth: 17 ft. Surface area: 80 acres.
Wisconsin DNR rates Panfish as abundant on Army Lake. DNR survey details →
Army Lake is a 80-acre mesotrophic lake in Walworth County, Wisconsin with a maximum depth of 17 feet. Overall water quality is improving over recent sampling years. The lake supports 3 documented fish species including Panfish, Largemouth Bass, and Northern Pike. Public access is available with 1 public boat landing. Compared to the 18 other monitored lakes in Walworth County, Army Lake ranks #12 for water quality.
Source: EPA Water Quality Portal sampling records, Wisconsin DNR Surface Water, last sampled 2025-09-11. Methodology: how these readings are compared.
Army Lake covers about 80 acres in Walworth County. It has one public boat landing. For a place on the water, look through cabin and lake-house rentals near Army Lake on Vrbo. For a hotel or motel room, Booking.com and Expedia both search around the lake.
What Army Lake is good for
From access and monitoring records, not editorial picks.
- Boat launch1 documented ramp
- Fishing3 species recorded
Swimming conditions
Readings onlyLimited data
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 Army 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.
Water quality measurements for Army Lake
These are the measurements Wisconsin DNR publishes for Army Lake, shown as reported. The condition class beside each reading is the EPA National Lakes Assessment class for this lake’s ecoregion.
Moderate clarity, visible to about 8.2 ft. Phosphorus 11.7 µg/L. TSI 43.
| Measure | Reading | Where it sits |
|---|---|---|
| Water clarity (Secchi depth) | 8.2ft | Measured, not scored How deep a black-and-white disk stays visible from the surface. Higher is clearer. |
| Total phosphorus | 11.7µg/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. | 43 | Mesotrophic OligotrophicMesotrophicEutrophicHypereutrophic |
Moderate nutrients, good water quality
Ask about Army Lake
Answers come straight from the public measurements and survey records on this page.
Wisconsin DNR rates Panfish as abundant on Army Lake.
A DNR fisheries survey reports fish abundance and catch rates, not water quality. LakeQuality shows Army Lake’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. 1 station on file (most recent sample 2025).
Fish Species (DNR-rated)
Lake Details
Max depth
17 ft
Surface area
80 acres
Public access
Yes
Listed by Wisconsin DNR
Lake Size & Watershed
Watershed (drainage) area
1 sq mi
HydroLAKES / HydroSHEDS
Shoreline
1.4 mi
HydroLAKES / HydroSHEDS
Elevation
810 ft
Size, shoreline, and watershed area from HydroLAKES (HydroSHEDS).
Recreation & Access
- Army 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 Army Lake
Compare lakeside cabins, hotels, and vacation rentals near Army Lake in Walworth 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 Army Lake
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 →
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Fish Species
Click a species to see every lake where it is documented.
Fishing Army 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: Improving
Based on 6 years of monitoring (2020–2025).
Water clarity
Improving6 years
Phosphorus
Improving-0.96 µg/L/yr5 years
Chlorophyll-a
Improving-0.1 µg/L/yr3 years
Regulated Pollution Sources Nearby
1 EPA-permitted facility operate within about 5 miles of Army Lake under Clean Water Act (NPDES) discharge permits. 1 facility has a reported Clean Water Act violation in the past three years.
- East Troy Wastewater Treatment FacilityEast Troy · 2.9 mi away · NPDES WI0020397Recent 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 Walworth County
Frequently asked questions about Army Lake
Where is Army Lake?
- Army Lake is a lake in Walworth County, Wisconsin. Its water-quality measurements are published by Wisconsin DNR and shown on this page as reported.
What is the water quality of Army Lake?
- Army Lake in Walworth County, Wisconsin has water-quality measurements published by Wisconsin DNR, shown here as reported. Water clarity: 8.2 ft visibility. Phosphorus: 11.7 µg/L. Maximum depth: 17 ft. Surface area: 80 acres.
Is Army Lake safe to swim in?
- Nutrient and algae readings are not a swimming clearance. Check local advisories before you swim.
How deep is Army Lake?
- Army Lake has a maximum depth of 17 feet. The lake covers 80 acres.
What fish are in Army Lake?
- Fish species found in Army Lake include Panfish, Largemouth Bass, Northern Pike. Army Lake is located in Walworth County, Wisconsin.
What did the DNR fisheries survey find at Army Lake?
- Wisconsin DNR rates Panfish as abundant on Army Lake. A DNR fisheries survey reports fish abundance and catch rates, not water quality. LakeQuality shows Army Lake’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 Army Lake?
- Army Lake has 1 documented boat landing in the USGS National Boat Ramps inventory. Named access points include Army Lake. Public access is listed as yes.
Can I fish at Army Lake?
- Army 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 Army Lake across LakeQuality
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Fish species and best lakes in Walworth County
Species activity outlook by water temperature and season
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Where this data comes from
12 measurements from 1 monitoring station, 2021–2025. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- Wisconsin Department of Natural Resources
WIDNR_WQX12 samples · 2021–2025
Analytical methods
- Phosphorus by Colorimetry
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
Regulated discharger data from EPA ECHO (ICIS-NPDES)
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