Gilbert Lake
Gilbert Lake in Waushara County, Wisconsin has a water quality grade of B (Good). Water clarity: 12 ft visibility. Phosphorus: 11.9 µg/L. Maximum depth: 65 ft. Surface area: 139 acres.
Wisconsin DNR lists Largemouth Bass as common on Gilbert Lake. DNR survey details →
- Clarity
- 12 ft
- Max depth
- 65 ft
- Area
- 139 acres
- Type
- Mesotrophic
- Trend
- ↑ Improving
- Public access
- Yes
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Gilbert Lake is a 139-acre mesotrophic lake in Waushara County, Wisconsin with a maximum depth of 65 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 5 documented fish species including Panfish, Largemouth Bass, and Smallmouth Bass. Public access is available with 1 public boat landing. Compared to the 15 other monitored lakes in Waushara County, Gilbert Lake ranks #9 for water quality.
Source: EPA Water Quality Portal sampling records, Wisconsin DNR Surface Water, last sampled 2026-06-24. 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)
Good clarity, visible to about 12 ft. Phosphorus level: 11.9 µg/L. Trophic State Index: 41.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 12 ft | Not graded |
| Phosphorus | 11.9 µg/L | Good |
| Chlorophyll-a (Algae) | No recent samples | |
| Trophic State Index (TSI) | 41 | Mesotrophic |
Moderate nutrients, good water quality
Where to stay near Gilbert Lake
Compare lakeside cabins, hotels, and vacation rentals near Gilbert Lake in Waushara 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 Gilbert Lake
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Wisconsin DNR lists Largemouth Bass as common on Gilbert Lake.
A DNR fisheries survey reports fish abundance and catch rates, not a water-quality grade. LakeQuality grades Gilbert Lake B from EPA Water Quality Portal chemistry, and the water-quality trend over 7 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 1986. 1 station on file (most recent sample 2025).
Fish Species (DNR-rated)
Lake Details
| Characteristic | Value |
|---|---|
| Maximum Depth | 65 ft |
| Surface Area | 139 acres |
| Public Access | Yes |
Lake Size & Watershed
Size, shoreline, and watershed area from HydroLAKES (HydroSHEDS).
Recreation & Access
- Gilbert LakePublic
Named access points in the USGS National Boat Ramps inventory, within about 3 miles. More lakes with boat ramps
Fish Species
Click a species to see every graded lake where it is documented.
Fishing Gilbert 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.
Water Quality Trend: ↑ Improving
Based on 7 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Water Clarity | ↑ Improving | +0.414 m/yr | 6 |
| Phosphorus | → Stable | +0.01 µg/L/yr | 7 |
County Ranking
Ranked #9 of 16 lakes in Waushara County
Nearby Lakes in Waushara County
Frequently asked questions about Gilbert Lake
Where is Gilbert Lake?
- Gilbert Lake is a lake in Waushara County, Wisconsin. LakeQuality grades it B for nutrients and algae. The letter is not a swimming clearance.
What is the water quality grade for Gilbert Lake?
- Gilbert Lake in Waushara County, Wisconsin has a water quality grade of B (Good). Water clarity: 12 ft visibility. Phosphorus: 11.9 µg/L. Maximum depth: 65 ft. Surface area: 139 acres.
Is Gilbert Lake safe to swim in?
- Good for swimming, clear water with low algae levels. Gilbert Lake has a water quality grade of B (Good). Always check local health department advisories before swimming.
How deep is Gilbert Lake?
- Gilbert Lake has a maximum depth of 65 feet. The lake covers 139 acres.
What fish are in Gilbert Lake?
- Fish species found in Gilbert Lake include Panfish, Largemouth Bass, Smallmouth Bass, Northern Pike, Walleye. Gilbert Lake is located in Waushara County, Wisconsin.
What did the DNR fisheries survey find at Gilbert Lake?
- Wisconsin DNR lists Largemouth Bass as common on Gilbert Lake. A DNR fisheries survey reports fish abundance and catch rates, not a water-quality grade. LakeQuality grades Gilbert Lake B from EPA Water Quality Portal chemistry, and the water-quality trend over 7 years of monitoring is improving. Catch rate is not a swim clearance and is not a weekly bite report.
Are there boat ramps on Gilbert Lake?
- Gilbert Lake has 1 documented boat landing in the USGS National Boat Ramps inventory. Named access points include Gilbert Lake. Public access is listed as yes.
Explore Gilbert Lake across LakeQuality
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Fish species and best lakes in Waushara County
Species activity outlook by water temperature and season
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Moderate nutrients, good water quality
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State Parks Near Gilbert Lake
Other Grade B Lakes in Wisconsin
Mesotrophic Lakes in Wisconsin
Where this data comes from
43 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_WQX43 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