Boundary Lake
Boundary Lake in Oconto County, Wisconsin has a water quality grade of B (Good). Water clarity: 14 ft visibility. Phosphorus: 12.1 µg/L. Maximum depth: 19 ft. Surface area: 36 acres.
Wisconsin DNR rates Panfish as abundant on Boundary Lake. DNR survey details →
- Clarity
- 14 ft
- Typical in August
- 77°F
- Max depth
- 19 ft
- Area
- 36 acres
- Type
- Oligotrophic
- Trend
- ↑ Improving
- Public access
- Yes
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Boundary Lake is a 36-acre cold, clear oligotrophic lake in Oconto County, Wisconsin with a maximum depth of 19 feet. Water quality is graded B based on 1 sampling years through 2024. Overall water quality is improving over recent sampling years. The lake supports 4 documented fish species including Panfish, Largemouth Bass, and Smallmouth Bass. Public access is available with 1 public boat landing. Compared to the 38 other monitored lakes in Oconto County, Boundary Lake ranks #30 for water quality.
Source: EPA Water Quality Portal sampling records, Wisconsin DNR Surface Water, last sampled 2024-09-10. Grade methodology: LakeQuality 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 14 ft. Phosphorus level: 12.1 µg/L. Trophic State Index: 40.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 14 ft | Not graded |
| Phosphorus | 12.1 µg/L | Good |
| Chlorophyll-a (Algae) | No recent samples | |
| Trophic State Index (TSI) | 40 | Oligotrophic |
Low nutrients, clear water, excellent for swimming
Where to stay near Boundary Lake
Compare lakeside cabins, hotels, and vacation rentals near Boundary Lake in Oconto 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 Boundary Lake
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Water Temperature
Boundary Lake typically sits around 77°F at the surface in August. Summer average is about 79°F. Usually warmest in Jul (about 82°F) and coldest in May (about 67°F). These are typical values by month — not a live reading.
Typical surface water temperature by month, from 16 field readings (2024–2024) via the EPA Water Quality Portal. See the full Boundary Lake water temperature breakdown →
Wisconsin DNR rates Panfish as abundant on Boundary Lake.
A DNR fisheries survey reports fish abundance and catch rates, not a water-quality grade. LakeQuality grades Boundary Lake B from EPA Water Quality Portal chemistry, and the water-quality trend over 2 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. 1 station on file (most recent sample 2024).
Fish Species (DNR-rated)
Lake Details
| Characteristic | Value |
|---|---|
| Maximum Depth | 19 ft |
| Surface Area | 36 acres |
| Public Access | Yes |
Recreation & Access
- Boundary 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 Boundary 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 2 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Water Clarity | ↑ Improving | +1.5 m/yr | 2 |
County Ranking
Ranked #30 of 39 lakes in Oconto County
Nearby Lakes in Oconto County
Frequently asked questions about Boundary Lake
Where is Boundary Lake?
- Boundary Lake is a lake in Oconto County, Wisconsin. LakeQuality grades it B for nutrients and algae. The letter is not a swimming clearance.
What is the water quality grade for Boundary Lake?
- Boundary Lake in Oconto County, Wisconsin has a water quality grade of B (Good). Water clarity: 14 ft visibility. Phosphorus: 12.1 µg/L. Maximum depth: 19 ft. Surface area: 36 acres.
Is Boundary Lake safe to swim in?
- Good for swimming, clear water with low algae levels. Boundary Lake has a water quality grade of B (Good). Always check local health department advisories before swimming.
What is the water temperature of Boundary Lake?
- Boundary Lake typically sits around 77°F at the surface in August, from 16 EPA Water Quality Portal field readings (2024–2024). That is a typical value for the month, not a live reading.
How deep is Boundary Lake?
- Boundary Lake has a maximum depth of 19 feet. The lake covers 36 acres.
What fish are in Boundary Lake?
- Fish species found in Boundary Lake include Panfish, Largemouth Bass, Smallmouth Bass, Northern Pike. Boundary Lake is located in Oconto County, Wisconsin.
What did the DNR fisheries survey find at Boundary Lake?
- Wisconsin DNR rates Panfish as abundant on Boundary Lake. A DNR fisheries survey reports fish abundance and catch rates, not a water-quality grade. LakeQuality grades Boundary Lake B from EPA Water Quality Portal chemistry, and the water-quality trend over 2 years of monitoring is improving. Catch rate is not a swim clearance and is not a weekly bite report.
Are there boat ramps on Boundary Lake?
- Boundary Lake has 1 documented boat landing in the USGS National Boat Ramps inventory. Named access points include Boundary Lake. Public access is listed as yes.
Explore Boundary Lake across LakeQuality
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Where this data comes from
37 measurements from 1 monitoring station, 2023–2024. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- Wisconsin Department of Natural Resources
WIDNR_WQX37 samples · 2023–2024
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
Fish and recreation data from Wisconsin DNR Lakes
Named boat-access points from the USGS National Boat Ramps inventory