Hilbert Lake
Hilbert Lake in Marinette County, Wisconsin is not rated for water quality — its monitoring record does not meet the evidence bar. Water clarity: 12 ft visibility. Phosphorus: 13.1 µg/L. Maximum depth: 32 ft. Surface area: 278 acres.
- Clarity
- 12 ft
- Max depth
- 32 ft
- Area
- 278 acres
- Trend
- ↓ Declining
- Public access
- Yes
Next lake in Marinette County
Why Hilbert Lake has no grade
We grade a lake only when its monitoring record clears the evidence bar: at least three phosphorus or chlorophyll-a samples in the last ten years, scored against EPA National Lakes Assessment thresholds for this lake’s ecoregion. For Hilbert Lake, no nutrient or algae measurement meets the evidence bar (at least 3 samples within 10 years). Sampling here has recorded water clarity and phosphorus, but not algae (chlorophyll-a).
Not Rated is not an F. It is EPA Integrated Reporting Category 3 — insufficient information. The water here may be excellent or poor; nobody has measured enough of it to say. Everything below that has been measured is still reported on this page.
Sampling is run by WI DNR and volunteer programs, and published through the EPA Water Quality Portal. Read the full grading methodology.
Hilbert Lake is a 278-acre lake in Marinette County, Wisconsin with a maximum depth of 32 feet. Overall water quality is declining 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.
Source: EPA Water Quality Portal sampling records, Wisconsin DNR Surface Water, last sampled 2023-08-31. Grade methodology: LakeGrade methodology.
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Swimming Safety
Not ratedLimited data
Not rated for swimming — there is not enough monitoring data to judge this lake
Water quality measurements for Hilbert Lake
These readings exist but do not meet the evidence bar for an A–F grade — see why.
Good clarity, visible to about 12 ft. Phosphorus level: 13.1 µg/L. Trophic State Index: 41.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 12 ft | Not graded |
| Phosphorus | 13.1 µg/L | Not graded |
| Chlorophyll-a (Algae) | No recent samples | |
| Trophic State Index (TSI) | 41 | Mesotrophic |
Moderate nutrients, good water quality
Where to stay near Hilbert Lake
Compare lakeside cabins, hotels, and vacation rentals near Hilbert Lake in Marinette 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 Hilbert Lake
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Lake Details
| Characteristic | Value |
|---|---|
| Maximum Depth | 32 ft |
| Surface Area | 278 acres |
| Public Access | Yes |
Lake Size & Watershed
Size, shoreline, and watershed area from HydroLAKES (HydroSHEDS).
Recreation & Access
- Hilbert Lake - EastPublic
Fish Species
Click a species to see every graded lake where it is documented.
Fishing Hilbert 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. 2 stations on file (most recent sample 2023).
Fish Species (DNR-rated)
DNR Reports & Resources
Wisconsin DNR Fisheries scientists publish multi-year survey reports for Hilbert 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).
- 2021Hilbert Lake comprehensive survey, 2021Comprehensive Survey · WI DNR · 2021 (PDF)
Water Quality Trend: ↓ Declining
Based on 3 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Water Clarity | ↓ Declining | -2.25 m/yr | 2 |
| Phosphorus | ↓ Declining | +1.92 µg/L/yr | 3 |
EPA Impairment Status
Hilbert Lake 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 WI10001760 · Official waterbody report · Matched by proximity (1.42 km)
Graded lakes near Hilbert Lake
Hilbert Lake has no grade, but these lakes within a short drive do.
Nearby Lakes in Marinette County
Frequently asked questions about Hilbert Lake
What is the water quality grade for Hilbert Lake?
- Hilbert Lake in Marinette County, Wisconsin is not rated for water quality — its monitoring record does not meet the evidence bar. Water clarity: 12 ft visibility. Phosphorus: 13.1 µg/L. Maximum depth: 32 ft. Surface area: 278 acres.
Is Hilbert Lake safe to swim in?
- Not rated for swimming — there is not enough monitoring data to judge this lake. Hilbert Lake is not rated for water quality — its monitoring record does not meet the evidence bar. Always check local health department advisories before swimming.
How deep is Hilbert Lake?
- Hilbert Lake has a maximum depth of 32 feet. The lake covers 278 acres.
What fish are in Hilbert Lake?
- Fish species found in Hilbert Lake include Panfish, Largemouth Bass, Smallmouth Bass, Northern Pike, Walleye. Hilbert Lake is located in Marinette County, Wisconsin.
Are there boat ramps on Hilbert Lake?
- Hilbert Lake has 1 documented boat landing in the USGS National Boat Ramps inventory. Named access points include Hilbert Lake - East. Public access is listed as yes.
Explore Hilbert 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 Marinette County
Species activity outlook by water temperature and season
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Wisconsin's cleanest and most-polluted lakes, ranked
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Where this data comes from
2 measurements from 1 monitoring station, 2023. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- Wisconsin Department of Natural Resources
WIDNR_WQX2 samples · 2023
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
Impairment status from EPA ATTAINS 303(d) database
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