Fawn Lake
Fawn Lake in Adams County, Wisconsin has a water quality grade of B (Good). Water clarity: 9.5 ft visibility. Phosphorus: 20.6 µg/L. Surface area: 19 acres.
- Clarity
- 9.5 ft
- Typical in August
- 79°F
- Area
- 19 acres
- Type
- Mesotrophic
- Trend
- ↓ Declining
- Public access
- Yes
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Fawn Lake is a 19-acre mesotrophic lake in Adams County, Wisconsin. Water quality is graded B based on 1 sampling years through 2026. Overall water quality is declining over recent sampling years. Limited fish-species data available. Public access is available with 1 public boat landing. Compared to the 17 other monitored lakes in Adams County, Fawn Lake ranks #5 for water quality.
Source: EPA Water Quality Portal sampling records, Wisconsin DNR Surface Water, last sampled 2026-07-04. Grade methodology: LakeQuality methodology.
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Swimming Safety
Grade onlyLow algae
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 9.5 ft. Phosphorus level: 20.6 µg/L. Trophic State Index: 46.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 9.5 ft | Not graded |
| Phosphorus | 20.6 µg/L | Good |
| Chlorophyll-a (Algae) | No recent samples | |
| Trophic State Index (TSI) | 46 | Mesotrophic |
Moderate nutrients, good water quality
Where to stay near Fawn Lake
Compare lakeside cabins, hotels, and vacation rentals near Fawn Lake in Adams 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 Fawn Lake
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Planning a whole trip? See where to stay at Wisconsin’s top lakes →
Water Temperature
Fawn Lake typically sits around 79°F at the surface in August. Summer average is about 79°F. Usually warmest in Jul (about 82°F) and coldest in May (about 69°F). These are typical values by month — not a live reading.
Typical surface water temperature by month, from 16 field readings (2024–2026) via the EPA Water Quality Portal. See the full Fawn Lake water temperature breakdown →
Lake Details
| Characteristic | Value |
|---|---|
| Surface Area | 19 acres |
| Public Access | Yes |
No bathymetric survey has been published for Fawn Lake, so its depth is not documented here.
Recreation & Access
- Fawn LakePublic
Named access points in the USGS National Boat Ramps inventory, within about 3 miles. More lakes with boat ramps
Fishing Fawn Lake
Water Quality Trend: ↓ Declining
Based on 7 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Water Clarity | ↓ Declining | -0.259 m/yr | 7 |
| Phosphorus | ↓ Declining | +1.21 µg/L/yr | 7 |
Reservoir Info (USACE NID)
Fawn Lake is a man-made reservoir impounded by the Fawn Lake (completed 1972), built primarily for recreation on the TROUT CREEK; earth-type dam, 19 ft tall and 1,000 ft long.
- Surface area
- 19 ac
- Normal storage
- 90 ac-ft
- Max storage
- 190 ac-ft
- Drainage area
- 2.2 sq mi
- Hazard class
- High
- Owner
- Adams County
Source: USACE National Inventory of Dams, NID ID WI00094 · Operator website
Regulated Pollution Sources Nearby
3 EPA-permitted facilities operate within about 5 miles of Fawn Lake under Clean Water Act (NPDES) discharge permits. 1 facility has a reported Clean Water Act violation in the past three years.
- Lyndon Station Wastewater Treatment FacilityLyndon Station · 3.8 mi away · NPDES WI0060488Recent violation
- Crockett'S ResortJuneau County · 4 mi away · NPDES WI0061263
- Arrowhead Resort CampgroundWisconsin Dells · 4.3 mi away · NPDES WI0031909
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 #5 of 18 lakes in Adams County
Nearby Lakes in Adams County
Frequently asked questions about Fawn Lake
Where is Fawn Lake?
- Fawn Lake is a lake in Adams County, Wisconsin. LakeQuality grades it B for nutrients and algae. The letter is not a swimming clearance.
What is the water quality grade for Fawn Lake?
- Fawn Lake in Adams County, Wisconsin has a water quality grade of B (Good). Water clarity: 9.5 ft visibility. Phosphorus: 20.6 µg/L. Surface area: 19 acres.
Is Fawn Lake safe to swim in?
- Good for swimming, clear water with low algae levels. Fawn Lake has a water quality grade of B (Good). Always check local health department advisories before swimming.
What is the water temperature of Fawn Lake?
- Fawn Lake typically sits around 79°F at the surface in August, from 16 EPA Water Quality Portal field readings (2024–2026). That is a typical value for the month, not a live reading.
Are there boat ramps on Fawn Lake?
- Fawn Lake has 1 documented boat landing in the USGS National Boat Ramps inventory. Named access points include Fawn Lake. Public access is listed as yes.
Explore Fawn Lake across LakeQuality
20.9 mi away · cable-pulled, no boat wake
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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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State Parks Near Fawn Lake
Other Grade B Lakes in Wisconsin
Mesotrophic Lakes in Wisconsin
Where this data comes from
59 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 Resources
WIDNR_WQX59 samples · 2020–2026
Analytical methods
- Phosphorus by Colorimetry
Monitoring station identifiers (2)
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)
Named boat-access points from the USGS National Boat Ramps inventory