Roberts Lake
Roberts Lake in Forest County, Wisconsin has a water quality grade of B (Good). Water clarity: 11.7 ft visibility. Phosphorus: 11.1 µg/L. Maximum depth: 31 ft. Surface area: 435 acres.
- Clarity
- 11.7 ft
- Max depth
- 31 ft
- Area
- 435 acres
- Type
- Mesotrophic
- Trend
- ↑ Improving
- Public access
- Yes
Next lake in Forest County
Roberts Lake is a 435-acre mesotrophic lake in Forest County, Wisconsin with a maximum depth of 31 feet. Water quality is graded B based on 1 sampling years through 2026. Overall water quality is improving over recent sampling years. The lake supports 6 documented fish species including Musky, Panfish, and Largemouth Bass. Public access is available with 1 public boat landing. Compared to the 22 other monitored lakes in Forest County, Roberts Lake ranks #15 for water quality.
Source: EPA Water Quality Portal sampling records, Wisconsin DNR Surface Water, last sampled 2026-06-06. 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.
Good for swimming, clear water with low algae levels
Water Quality Grade: B (Good)
Good clarity, visible to about 11.7 ft. Phosphorus level: 11.1 µg/L. Trophic State Index: 40.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 11.7 ft | Not graded |
| Phosphorus | 11.1 µg/L | Good |
| Chlorophyll-a (Algae) | No recent samples | |
| Trophic State Index (TSI) | 40 | Mesotrophic |
Moderate nutrients, good water quality
Where to stay near Roberts Lake
Compare lakeside cabins, hotels, and vacation rentals near Roberts Lake in Forest 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.
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Lake Details
| Characteristic | Value |
|---|---|
| Maximum Depth | 31 ft |
| Surface Area | 435 acres |
| Public Access | Yes |
Lake Size & Watershed
Size, shoreline, and watershed area from HydroLAKES (HydroSHEDS).
Recreation & Access
- Roberts LakePublic
Fish Species
Click a species to see every graded lake where it is documented.
Fishing Roberts 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. Monitored by volunteers since 1995. 1 station on file (most recent sample 2025).
Fish Species (DNR-rated)
DNR Reports & Resources
Wisconsin DNR Fisheries scientists publish multi-year survey reports for Roberts Lake covering fish populations, stocking, water quality, and management. 1 report on file.
These links open on the official state DNR websites (Wisconsin DNR survey PDFs · Minnesota DNR LakeFinder).
- 2022Roberts Lake fisheries summary, 2022Fisheries Survey · WI DNR · 2022 (PDF)
Water Quality Trend: ↑ Improving
Based on 6 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Water Clarity | ↑ Improving | +0.578 m/yr | 5 |
| Phosphorus | ↑ Improving | -0.85 µg/L/yr | 3 |
County Ranking
Ranked #15 of 23 lakes in Forest County
Nearby Lakes in Forest County
Frequently asked questions about Roberts Lake
What is the water quality grade for Roberts Lake?
- Roberts Lake in Forest County, Wisconsin has a water quality grade of B (Good). Water clarity: 11.7 ft visibility. Phosphorus: 11.1 µg/L. Maximum depth: 31 ft. Surface area: 435 acres.
Is Roberts Lake safe to swim in?
- Good for swimming, clear water with low algae levels. Roberts Lake has a water quality grade of B (Good). Always check local health department advisories before swimming.
How deep is Roberts Lake?
- Roberts Lake has a maximum depth of 31 feet. The lake covers 435 acres.
What fish are in Roberts Lake?
- Fish species found in Roberts Lake include Musky, Panfish, Largemouth Bass, Smallmouth Bass, Northern Pike, Walleye. Roberts Lake is located in Forest County, Wisconsin.
Are there boat ramps on Roberts Lake?
- Roberts Lake has 1 documented boat landing in the USGS National Boat Ramps inventory. Named access points include Roberts Lake. Public access is listed as yes.
Explore Roberts Lake across LakeGrade
Depth, room, public access, and the state wake-sport rules
Fish species and top-graded lakes across Wisconsin
Fish species and best lakes in Forest County
Species activity outlook by water temperature and season
Top lakes and where to stay in the Northwoods Wisconsin area
Where to stay at Wisconsin's top lakes, each with its grade
Lakes in the Wolf River Watershed, ranked by water quality
Moderate nutrients, good water quality
Wisconsin's cleanest and most-polluted lakes, ranked
More Wisconsin Lake Rankings
Other Grade B Lakes in Wisconsin
Mesotrophic Lakes in Wisconsin
Compare Roberts Lake With Nearby Lakes
Where this data comes from
28 measurements from 1 monitoring station, 2020–2026. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- Wisconsin Department of Natural Resources
WIDNR_WQX28 samples · 2020–2026
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
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