Lake Beulah
Lake Beulah in Walworth County, Wisconsin has a water quality grade of A (Excellent). Water clarity: 10 ft visibility. Phosphorus: 13.4 µg/L. Chlorophyll-a (algae): 2.5 µg/L. Maximum depth: 58 ft. Surface area: 812 acres.
Wisconsin DNR lists Panfish as common on Lake Beulah. DNR survey details →
- Clarity
- 10 ft
- Typical in August
- 77°F
- Max depth
- 58 ft
- Area
- 812 acres
- Type
- Mesotrophic
- Trend
- ↑ Improving
- Public access
- Yes
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Lake Beulah is a 812-acre mesotrophic lake in Walworth County, Wisconsin with a maximum depth of 58 feet. Water quality is graded A based on 2 sampling years through 2026. 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, Lake Beulah ranks #2 for water quality.
Source: EPA Water Quality Portal sampling records, Wisconsin DNR Surface Water, last sampled 2026-05-08. Grade methodology: LakeGrade 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.
Excellent for swimming, crystal clear water with minimal algae
Water Quality Grade: A (Excellent)
Good clarity, visible to about 10 ft. Phosphorus level: 13.4 µg/L. Chlorophyll-a: 2.5 µg/L. Trophic State Index: 42.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 10 ft | Not graded |
| Phosphorus | 13.4 µg/L | Good |
| Chlorophyll-a (Algae) | 2.5 µg/L | Good |
| Trophic State Index (TSI) | 42 | Mesotrophic |
Moderate nutrients, good water quality
Where to stay near Lake Beulah
Compare lakeside cabins, hotels, and vacation rentals near Lake Beulah 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 Lake Beulah
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Planning a whole trip? See where to stay at Wisconsin’s top lakes →
Water Temperature
Lake Beulah typically sits around 77°F at the surface in August. Summer average is about 80°F. Usually warmest in Jun (about 82°F) and coldest in May (about 58°F). These are typical values by month — not a live reading.
Typical surface water temperature by month, from 14 field readings (2024–2026) via the EPA Water Quality Portal.
Blue-Green Algae (Cyanobacteria)
There’s no recent EPA CyAN cyanobacteria estimate for Lake Beulah — clouds, ice, or an off-season gap in coverage. The most recent reading was high (222,844 cells/mL) on March 28, 2026.
Blue-green algae can appear and clear within days, so check your state’s current advisory before swimming. EPA CyAN ↗
Wisconsin DNR lists Panfish as common on Lake Beulah.
A DNR fisheries survey reports fish abundance and catch rates, not a water-quality grade. LakeQuality grades Lake Beulah A 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. Monitored by volunteers since 1991. 7 stations on file (most recent sample 2026).
Fish Species (DNR-rated)
Lake Details
| Characteristic | Value |
|---|---|
| Maximum Depth | 58 ft |
| Surface Area | 812 acres |
| Public Access | Yes |
Recreation & Access
Fish Species
Click a species to see every graded lake where it is documented.
Fishing Lake Beulah
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 | +0.726 m/yr | 6 |
| Phosphorus | ↑ Improving | -0.61 µg/L/yr | 6 |
| Chlorophyll-a | ↓ Declining | +0.1 µg/L/yr | 3 |
Reservoir Info (USACE NID)
Lake Beulah is a man-made reservoir impounded by the Lake Beulah (completed 1840), built primarily for recreation on the Lake Beulah Outlet; gravity-type dam, 14 ft tall and 300 ft long.
- Surface area
- 834 ac
- Normal storage
- 5,000 ac-ft
- Max storage
- 7,000 ac-ft
- Drainage area
- 10 sq mi
- Hazard class
- High
- Owner
- Lake Beulah Management District;Walworth County
Source: USACE National Inventory of Dams, NID ID WI00699 · Operator website
EPA Impairment Status
Lake Beulah 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
Regulated Pollution Sources Nearby
1 EPA-permitted facility operate within about 5 miles of Lake Beulah under Clean Water Act (NPDES) discharge permits, including 1 classified by the EPA as major discharger.
- Plymouth Tube Co East Troy & Trent PlantsEast Troy · 1.7 mi away · NPDES WI0038938Major
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 #2 of 19 lakes in Walworth County
Nearby Lakes in Walworth County
Frequently asked questions about Lake Beulah
Where is Lake Beulah?
- Lake Beulah is a lake in Walworth County, Wisconsin. LakeQuality grades it A for nutrients and algae. The letter is not a swimming clearance.
What is the water quality grade for Lake Beulah?
- Lake Beulah in Walworth County, Wisconsin has a water quality grade of A (Excellent). Water clarity: 10 ft visibility. Phosphorus: 13.4 µg/L. Chlorophyll-a (algae): 2.5 µg/L. Maximum depth: 58 ft. Surface area: 812 acres.
Is Lake Beulah safe to swim in?
- Excellent for swimming, crystal clear water with minimal algae. Lake Beulah has a water quality grade of A (Excellent). Algae concentration (chlorophyll-a) is 2.5 µg/L. Always check local health department advisories before swimming.
What is the water temperature of Lake Beulah?
- Lake Beulah typically sits around 77°F at the surface in August, from 14 EPA Water Quality Portal field readings (2024–2026). That is a typical value for the month, not a live reading.
How deep is Lake Beulah?
- Lake Beulah has a maximum depth of 58 feet. The lake covers 812 acres.
What fish are in Lake Beulah?
- Fish species found in Lake Beulah include Panfish, Largemouth Bass, Northern Pike. Lake Beulah is located in Walworth County, Wisconsin.
What did the DNR fisheries survey find at Lake Beulah?
- Wisconsin DNR lists Panfish as common on Lake Beulah. A DNR fisheries survey reports fish abundance and catch rates, not a water-quality grade. LakeQuality grades Lake Beulah A 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.
Does Lake Beulah have blue-green algae?
- There is no recent EPA CyAN cyanobacteria estimate for Lake Beulah (clouds, ice, or an off-season gap). The most recent reading was high (222,844 cells/mL). Blue-green algae can appear and clear within days, so check Wisconsin's current advisory before swimming.
Are there boat ramps on Lake Beulah?
- Lake Beulah has 1 documented boat landing in the USGS National Boat Ramps inventory. Public access is listed as yes.
Explore Lake Beulah across LakeGrade
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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
147 measurements from 6 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_WQX95 samples · 2020–2026 - USGS Wisconsin Water Science Center
USGS-WI52 samples · 2020–2022
Analytical methods
- Phosphorus by Colorimetry
- Turbidity in Water
Monitoring station identifiers (6)
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