Squash Lake
Squash Lake in Oneida County, Wisconsin has a water quality grade of B (Good). Water clarity: 17.5 ft visibility. Phosphorus: 10 µg/L. Maximum depth: 74 ft. Surface area: 398 acres.
Wisconsin DNR lists Panfish as common on Squash Lake. DNR survey details →
- Clarity
- 17.5 ft
- Typical in August
- 71°F
- Max depth
- 74 ft
- Area
- 398 acres
- Type
- Oligotrophic
- Trend
- ↓ Declining
- Public access
- Yes
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Squash Lake is a 398-acre cold, clear oligotrophic lake in Oneida County, Wisconsin with a maximum depth of 74 feet. Water quality is graded B based on 1 sampling years through 2026. Overall water quality is declining over recent sampling years. The lake supports 6 documented fish species including Panfish, Largemouth Bass, and Smallmouth Bass. Public access is available with 1 public boat landing. Compared to the 66 other monitored lakes in Oneida County, Squash Lake ranks #15 for water quality.
Source: EPA Water Quality Portal sampling records, Wisconsin DNR Surface Water, last sampled 2026-04-25. 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.
Good for swimming, clear water with low algae levels
Water Quality Grade: B (Good)
Crystal clear, you can see 17.5 ft down. Phosphorus level: 10 µg/L. Trophic State Index: 37.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 17.5 ft | Not graded |
| Phosphorus | 10 µg/L | Good |
| Chlorophyll-a (Algae) | No recent samples | |
| Trophic State Index (TSI) | 37 | Oligotrophic |
Low nutrients, clear water, excellent for swimming
Where to stay near Squash Lake
Compare lakeside cabins, hotels, and vacation rentals near Squash Lake in Oneida 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 Squash Lake
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Planning a whole trip? See where to stay at Wisconsin’s top lakes →
Water Temperature
Squash Lake typically sits around 71°F at the surface in August. Summer average is about 72°F. Usually warmest in Jul (about 75°F) and coldest in Apr (about 46°F). These are typical values by month — not a live reading.
Typical surface water temperature by month, from 8 field readings (2024–2025) via the EPA Water Quality Portal. See the full Squash Lake water temperature breakdown →
Blue-Green Algae (Cyanobacteria)
There’s no recent EPA CyAN cyanobacteria estimate for Squash Lake — clouds, ice, or an off-season gap in coverage. The most recent reading was high (194,089 cells/mL) on May 23, 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 Squash Lake.
A DNR fisheries survey reports fish abundance and catch rates, not a water-quality grade. LakeQuality grades Squash Lake B from EPA Water Quality Portal chemistry, and the water-quality trend over 7 years of monitoring is declining. 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 1989. 2 stations on file (most recent sample 2025).
Fish Species (DNR-rated)
Lake Details
| Characteristic | Value |
|---|---|
| Maximum Depth | 74 ft |
| Surface Area | 398 acres |
| Public Access | Yes |
Lake Size & Watershed
Size, shoreline, and watershed area from HydroLAKES (HydroSHEDS).
Recreation & Access
- GudisPublic
Named access points from the USGS National Boat Ramps inventory, snapped within 5 km. More lakes with boat ramps
Fish Species
Click a species to see every graded lake where it is documented.
Fishing Squash 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: ↓ Declining
Based on 7 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Water Clarity | ↓ Declining | -0.743 m/yr | 7 |
| Phosphorus | → Stable | +0.11 µg/L/yr | 6 |
County Ranking
Ranked #15 of 67 lakes in Oneida County
Nearby Lakes in Oneida County
Frequently asked questions about Squash Lake
Where is Squash Lake?
- Squash Lake is a lake in Oneida County, Wisconsin. LakeQuality grades it B for nutrients and algae. The letter is not a swimming clearance.
What is the water quality grade for Squash Lake?
- Squash Lake in Oneida County, Wisconsin has a water quality grade of B (Good). Water clarity: 17.5 ft visibility. Phosphorus: 10 µg/L. Maximum depth: 74 ft. Surface area: 398 acres.
Is Squash Lake safe to swim in?
- Good for swimming, clear water with low algae levels. Squash Lake has a water quality grade of B (Good). Always check local health department advisories before swimming.
What is the water temperature of Squash Lake?
- Squash Lake typically sits around 71°F at the surface in August, from 8 EPA Water Quality Portal field readings (2024–2025). That is a typical value for the month, not a live reading.
How deep is Squash Lake?
- Squash Lake has a maximum depth of 74 feet. The lake covers 398 acres.
What fish are in Squash Lake?
- Fish species found in Squash Lake include Panfish, Largemouth Bass, Smallmouth Bass, Northern Pike, Trout, Walleye. Squash Lake is located in Oneida County, Wisconsin.
What did the DNR fisheries survey find at Squash Lake?
- Wisconsin DNR lists Panfish as common on Squash Lake. A DNR fisheries survey reports fish abundance and catch rates, not a water-quality grade. LakeQuality grades Squash Lake B from EPA Water Quality Portal chemistry, and the water-quality trend over 7 years of monitoring is declining. Catch rate is not a swim clearance and is not a weekly bite report.
Does Squash Lake have blue-green algae?
- There is no recent EPA CyAN cyanobacteria estimate for Squash Lake (clouds, ice, or an off-season gap). The most recent reading was high (194,089 cells/mL). Blue-green algae can appear and clear within days, so check Wisconsin's current advisory before swimming.
Are there boat ramps on Squash Lake?
- Squash Lake has 1 documented boat landing in the USGS National Boat Ramps inventory. Named access points include Gudis. Public access is listed as yes.
Explore Squash Lake across LakeGrade
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Where this data comes from
46 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_WQX46 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