Army Lake
Army Lake in Walworth County, Wisconsin has a water quality grade of B (Good). 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 →
- Clarity
- 8.2 ft
- Max depth
- 17 ft
- Area
- 80 acres
- Type
- Mesotrophic
- Trend
- ↑ Improving
- Public access
- Yes
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Army Lake is a 80-acre mesotrophic lake in Walworth County, Wisconsin with a maximum depth of 17 feet. Water quality is graded B based on 1 sampling years through 2025. 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. Grade methodology: LakeQuality methodology.
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Swimming Safety
Grade onlyLimited data
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.
Good for swimming, clear water with low algae levels
Water Quality Grade: B (Good)
Moderate clarity, visible to about 8.2 ft. Phosphorus level: 11.7 µg/L. Trophic State Index: 43.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 8.2 ft | Not graded |
| Phosphorus | 11.7 µg/L | Good |
| Chlorophyll-a (Algae) | No recent samples | |
| Trophic State Index (TSI) | 43 | Mesotrophic |
Moderate nutrients, good water quality
Where to stay 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
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Planning a whole trip? See where to stay at Wisconsin’s top lakes →
Wisconsin DNR rates Panfish as abundant on Army Lake.
A DNR fisheries survey reports fish abundance and catch rates, not a water-quality grade. LakeQuality grades Army Lake B from EPA Water Quality Portal chemistry, 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
| Characteristic | Value |
|---|---|
| Maximum Depth | 17 ft |
| Surface Area | 80 acres |
| Public Access | Yes |
Lake Size & Watershed
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
Fish Species
Click a species to see every graded 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 data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Water Clarity | ↑ Improving | +1.3 m/yr | 6 |
| Phosphorus | ↑ Improving | -0.96 µg/L/yr | 5 |
| Chlorophyll-a | ↑ Improving | -0.1 µg/L/yr | 3 |
EPA Impairment Status
Army Lake is officially listed as impaired under Clean Water Act §303(d) in the 2024 EPA reporting cycle (IR category 5).
Causes of impairment
Source: EPA ATTAINS assessment unit WI10000591 · Official waterbody report · Matched by proximity (1.99 km)
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.
County Ranking
Ranked #12 of 19 lakes in Walworth County
Nearby Lakes With Higher Grades
Army Lake holds Grade B. One nearby lake has a higher nutrient-and-algae grade — useful for a swim day, not a reason to skip lodging here.
Nearby Lakes in Walworth County
Frequently asked questions about Army Lake
Where is Army Lake?
- Army Lake is a lake in Walworth County, Wisconsin. LakeQuality grades it B for nutrients and algae. The letter is not a swimming clearance.
What is the water quality grade for Army Lake?
- Army Lake in Walworth County, Wisconsin has a water quality grade of B (Good). 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?
- Good for swimming, clear water with low algae levels. Army Lake has a water quality grade of B (Good). Always check local health department advisories before swimming.
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 a water-quality grade. LakeQuality grades Army Lake B from EPA Water Quality Portal chemistry, 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.
Explore Army Lake across LakeQuality
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Species activity outlook by water temperature and season
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Moderate nutrients, good water quality
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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)
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
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