Fawn Lake
Adams County, Wisconsin19 acresView mapDirections
Wisconsin DNR publishes the water-quality measurements for Fawn Lake. Here is what has been measured.
- Mesotrophic
- Public access
Fawn Lake in Adams County, Wisconsin has water-quality measurements published by Wisconsin DNR, shown here as reported. Water clarity: 9.5 ft visibility. Phosphorus: 20.6 µg/L. Surface area: 19 acres.
Fawn Lake is a 19-acre mesotrophic lake in Adams County, Wisconsin. 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. Methodology: how these readings are compared.
Fawn Lake covers about 19 acres in Adams County. It has one public boat landing. Vrbo is where to look for cabins and lake homes around Fawn Lake, and Booking.com and Expedia search hotels near the lake for your dates.
What Fawn Lake is good for
From access and monitoring records, not editorial picks.
- Boat launch1 documented ramp
Swimming conditions
Readings onlyLow algae
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 Fawn 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 Fawn Lake
These are the measurements Wisconsin DNR publishes for Fawn 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 9.5 ft. Phosphorus 20.6 µg/L. TSI 46.
| Measure | Reading | Where it sits |
|---|---|---|
| Water clarity (Secchi depth) | 9.5ft | Measured, not scored How deep a black-and-white disk stays visible from the surface. Higher is clearer. |
| Total phosphorus | 20.6µg/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. | 46 | Mesotrophic OligotrophicMesotrophicEutrophicHypereutrophic |
Moderate nutrients, good water quality
Ask about Fawn Lake
Answers come straight from the public measurements and survey records on this page.
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.
Column height runs from this lake’s coldest month (69°F) to its warmest (82°F).
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
Surface area
19 acres
Public access
Yes
Listed by Wisconsin DNR
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
Stays via Stay22
Stays 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
Prices for Oct 9–11, 4 adults. Change dates on the map below.
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Planning a whole trip? See where to stay at Wisconsin’s top lakes →
Follow Fawn Lake’s readings
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Fishing Fawn Lake
Water Quality Trend: Worsening
Based on 7 years of monitoring (2020–2026).
Water clarity
Worsening7 years
Phosphorus
Worsening+1.21 µg/L/yr7 years
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.
Nearby Lakes in Adams County
Frequently asked questions about Fawn Lake
Where is Fawn Lake?
- Fawn Lake is a lake in Adams County, Wisconsin. Its water-quality measurements are published by Wisconsin DNR and shown on this page as reported.
What is the water quality of Fawn Lake?
- Fawn Lake in Adams County, Wisconsin has water-quality measurements published by Wisconsin DNR, shown here as reported. Water clarity: 9.5 ft visibility. Phosphorus: 20.6 µg/L. Surface area: 19 acres.
Is Fawn Lake safe to swim in?
- Nutrient and algae readings are not a swimming clearance. Check local advisories before you swim.
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.
Can I fish at Fawn Lake?
- Fawn 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 Fawn Lake across LakeQuality
20.9 mi away · cable-pulled, no boat wake
Fish species and the cleanest lakes across Wisconsin
Fish species and best lakes in Adams County
Species activity outlook by water temperature and season
Where to stay at Wisconsin's top lakes, each with its readings
Lakes in the Wisconsin River Watershed, ranked by water quality
Wisconsin's cleanest lakes, ranked on agency measurements
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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)
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)
Named boat-access points from the USGS National Boat Ramps inventory