Avoca Lake
Avoca Lake in Iowa County, Wisconsin has a water quality grade of D (Nutrient-rich). Water clarity: 2 ft visibility. Phosphorus: 80.5 µg/L. Maximum depth: 10 ft. Surface area: 63 acres.
- Clarity
- 2 ft
- Typical in August
- 77°F
- Max depth
- 10 ft
- Area
- 63 acres
- Type
- Eutrophic
- Public access
- Yes
Grade D measures nutrients and algae, not whether this is a good place for a cabin trip. Cabins and rentals near Avoca Lake →
Next lake in Iowa County
Avoca Lake is a 63-acre productive, nutrient-rich eutrophic lake in Iowa County, Wisconsin with a maximum depth of 10 feet. Water quality is graded D based on 1 sampling years through 2024. The lake supports 4 documented fish species including Panfish, Largemouth Bass, and Northern Pike. Public access is available with 2 public boat landings. Compared to the 5 other monitored lakes in Iowa County, Avoca Lake ranks #6 for water quality.
Source: EPA Water Quality Portal sampling records, Wisconsin DNR Surface Water, last sampled 2024-10-28. Grade methodology: LakeGrade 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.
Nutrients and algae run higher than average — check local advisories before swimming, and skip the water if you see scum
Water Quality Grade: D (Nutrient-rich)
Very murky, less than 2 ft of visibility. Phosphorus level: 80.5 µg/L. Trophic State Index: 67.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 2 ft | Not graded |
| Phosphorus | 80.5 µg/L | Poor |
| Chlorophyll-a (Algae) | No recent samples | |
| Trophic State Index (TSI) | 67 | Eutrophic |
High nutrients, frequent algae, reduced clarity
Where to stay near Avoca Lake
Compare lakeside cabins, hotels, and vacation rentals near Avoca Lake in Iowa 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. The water-quality grade measures nutrients and algae, not lodging — cabins and rentals around Avoca Lake are listed below.
Top-rated places to stay near Avoca Lake
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Planning a whole trip? See where to stay at Wisconsin’s top lakes →
Water Temperature
Avoca Lake typically sits around 77°F at the surface in August. Summer average is about 76°F. Usually warmest in Aug (about 77°F) and coldest in Oct (about 52°F). These are typical values by month — not a live reading.
Typical surface water temperature by month, from 16 field readings (2024–2024) via the EPA Water Quality Portal. See the full Avoca Lake water temperature breakdown →
Lake Details
| Characteristic | Value |
|---|---|
| Maximum Depth | 10 ft |
| Surface Area | 63 acres |
| Public Access | Yes |
Recreation & Access
- Avoca LakePublic
- Buena VistaPublic
Fish Species
Click a species to see every graded lake where it is documented.
Fishing Avoca 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.
WI DNR Lake Profile
Authoritative data from the Wisconsin DNR LakePages. 1 station on file (most recent sample 2005).
Fish Species (DNR-rated)
Regulated Pollution Sources Nearby
2 EPA-permitted facilities operate within about 5 miles of Avoca Lake under Clean Water Act (NPDES) discharge permits. 1 facility has a reported Clean Water Act violation in the past three years.
- Avoca Wastewater Treatment FacilityAvoca · 1 mi away · NPDES WI0060151Recent violation
- Schmidt Farms West LlcBuena Vista, Town Of · 3 mi away · NPDES WI0066010
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 #6 of 6 lakes in Iowa County
Nearby Lakes With Higher Grades
Avoca Lake holds Grade D. 2 nearby lakes hold higher nutrient-and-algae grades — useful for a swim day, not a reason to skip lodging here.
Nearby Lakes in Iowa County
Frequently asked questions about Avoca Lake
What is the water quality grade for Avoca Lake?
- Avoca Lake in Iowa County, Wisconsin has a water quality grade of D (Nutrient-rich). Water clarity: 2 ft visibility. Phosphorus: 80.5 µg/L. Maximum depth: 10 ft. Surface area: 63 acres.
Is Avoca Lake safe to swim in?
- Nutrients and algae run higher than average — check local advisories before swimming, and skip the water if you see scum. Avoca Lake has a water quality grade of D (Nutrient-rich). Always check local health department advisories before swimming.
What is the water temperature of Avoca Lake?
- Avoca Lake typically sits around 77°F at the surface in August, from 16 EPA Water Quality Portal field readings (2024–2024). That is a typical value for the month, not a live reading.
How deep is Avoca Lake?
- Avoca Lake has a maximum depth of 10 feet. The lake covers 63 acres.
What fish are in Avoca Lake?
- Fish species found in Avoca Lake include Panfish, Largemouth Bass, Northern Pike, Walleye. Avoca Lake is located in Iowa County, Wisconsin.
Are there boat ramps on Avoca Lake?
- Avoca Lake has 2 documented boat landings in the USGS National Boat Ramps inventory. Named access points include Avoca Lake, Buena Vista. Public access is listed as yes.
Explore Avoca Lake across LakeGrade
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Species activity outlook by water temperature and season
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High nutrients, frequent algae, reduced clarity
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Where this data comes from
11 measurements from 1 monitoring station, 2024. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- Wisconsin Department of Natural Resources
WIDNR_WQX11 samples · 2024
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
Regulated discharger data from EPA ECHO (ICIS-NPDES)
Fish and recreation data from Wisconsin DNR Lakes
Named boat-access points from the USGS National Boat Ramps inventory