Long Lake
Long Lake in Waupaca County, Wisconsin has a water quality grade of B (Good). Water clarity: 13 ft visibility. Phosphorus: 12.5 µg/L. Maximum depth: 76 ft. Surface area: 112 acres.
- Clarity
- 13 ft
- Typical in August
- 72°F
- Max depth
- 76 ft
- Area
- 112 acres
- Type
- Mesotrophic
- Trend
- → Stable
- Public access
- Yes
Next lake in Waupaca County
Long Lake is a 112-acre mesotrophic lake in Waupaca County, Wisconsin with a maximum depth of 76 feet. Water quality is graded B based on 1 sampling years through 2026. Water clarity is improving over recent sampling years. The lake supports 7 documented fish species including Musky, Panfish, and Largemouth Bass. Public access is available with 1 public boat landing. Compared to the 20 other monitored lakes in Waupaca County, Long Lake ranks #7 for water quality.
Source: EPA Water Quality Portal sampling records, Wisconsin DNR Surface Water, last sampled 2026-06-28. Grade methodology: LakeGrade methodology.
Watch Long Lake water quality
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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 13 ft. Phosphorus level: 12.5 µg/L. Trophic State Index: 40.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 13 ft | Not graded |
| Phosphorus | 12.5 µg/L | Good |
| Chlorophyll-a (Algae) | No recent samples | |
| Trophic State Index (TSI) | 40 | Mesotrophic |
Moderate nutrients, good water quality
Where to stay near Long Lake
Compare lakeside cabins, hotels, and vacation rentals near Long Lake in Waupaca 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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Water Temperature
Long Lake typically sits around 72°F at the surface in August. Summer average is about 73°F. Usually warmest in Jul (about 75°F) and coldest in May (about 58°F). These are typical values by month — not a live reading.
Typical surface water temperature by month, from 23 field readings (2024–2026) via the EPA Water Quality Portal. See the full Long Lake water temperature breakdown →
Lake Details
| Characteristic | Value |
|---|---|
| Maximum Depth | 76 ft |
| Surface Area | 112 acres |
| Public Access | Yes |
Lake Size & Watershed
Size, shoreline, and watershed area from HydroLAKES (HydroSHEDS).
Recreation & Access
- Dake LakePublic
Fish Species
Click a species to see every graded lake where it is documented.
Fishing Long 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 2006. 2 stations on file (most recent sample 2025).
Fish Species (DNR-rated)
Water Quality Trend: → Stable
Based on 7 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Water Clarity | ↑ Improving | +0.527 m/yr | 7 |
| Phosphorus | ↓ Declining | +0.32 µg/L/yr | 6 |
EPA Impairment Status
Long 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 WI10016632 · Official waterbody report · Matched by proximity (1.03 km)
County Ranking
Ranked #7 of 21 lakes in Waupaca County
Nearby Lakes in Waupaca County
Frequently asked questions about Long Lake
What is the water quality grade for Long Lake?
- Long Lake in Waupaca County, Wisconsin has a water quality grade of B (Good). Water clarity: 13 ft visibility. Phosphorus: 12.5 µg/L. Maximum depth: 76 ft. Surface area: 112 acres.
Is Long Lake safe to swim in?
- Good for swimming, clear water with low algae levels. Long Lake has a water quality grade of B (Good). Always check local health department advisories before swimming.
What is the water temperature of Long Lake?
- Long Lake typically sits around 72°F at the surface in August, from 23 EPA Water Quality Portal field readings (2024–2026). That is a typical value for the month, not a live reading.
How deep is Long Lake?
- Long Lake has a maximum depth of 76 feet. The lake covers 112 acres.
What fish are in Long Lake?
- Fish species found in Long Lake include Musky, Panfish, Largemouth Bass, Smallmouth Bass, Northern Pike, Trout, Walleye. Long Lake is located in Waupaca County, Wisconsin.
Are there boat ramps on Long Lake?
- Long Lake has 1 documented boat landing in the USGS National Boat Ramps inventory. Named access points include Dake Lake. Public access is listed as yes.
Explore Long Lake across LakeGrade
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Species activity outlook by water temperature and season
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Moderate nutrients, good water quality
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State Parks Near Long Lake
Other Grade B Lakes in Wisconsin
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Where this data comes from
50 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_WQX50 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
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