Long Lake
Long Lake in Chippewa County, Wisconsin has a water quality grade of B (Good). Water clarity: 13.1 ft visibility. Phosphorus: 12.4 µg/L. Maximum depth: 101 ft. Surface area: 936 acres.
Wisconsin DNR rates Walleye as abundant on Long Lake. DNR survey details →
- Clarity
- 13.1 ft
- Max depth
- 101 ft
- Area
- 936 acres
- Type
- Mesotrophic
- Trend
- ↑ Improving
- Public access
- Yes
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Long Lake is a 936-acre mesotrophic lake in Chippewa County, Wisconsin with a maximum depth of 101 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 6 documented fish species including Musky, Panfish, and Largemouth Bass. Public access is available with 1 public boat landing. Compared to the 6 other monitored lakes in Chippewa County, Long Lake ranks #3 for water quality.
Source: EPA Water Quality Portal sampling records, Wisconsin DNR Surface Water, last sampled 2026-07-07. Grade methodology: LakeQuality methodology.
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Swimming Safety
Grade onlyBacteria A
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.
Based on E. coli testing, Long Lake never exceeded the EPA safe-swimming threshold (235 MPN/100mL) — on 0% of 35 samples across 3 seasons.
This is a historical summary of past testing, not a current condition — bacteria levels change quickly, especially after rain. Always check Wisconsin’s current beach and health-department advisories before swimming.
Water Quality Grade: B (Good)
Good clarity, visible to about 13.1 ft. Phosphorus level: 12.4 µg/L. Trophic State Index: 40.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 13.1 ft | Not graded |
| Phosphorus | 12.4 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 Chippewa 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 Long Lake
Availability and prices from Stay22 partners (Booking.com, Vrbo, Expedia). We may earn a commission from bookings, at no extra cost to you.
Planning a whole trip? See where to stay at Wisconsin’s top lakes →
Blue-Green Algae (Cyanobacteria)
There’s no recent EPA CyAN cyanobacteria estimate for Long Lake — clouds, ice, or an off-season gap in coverage. The most recent reading was low (12,942 cells/mL) on July 7, 2026.
Blue-green algae can appear and clear within days, so check your state’s current advisory before swimming. EPA CyAN ↗
Wisconsin DNR rates Walleye as abundant on Long Lake.
A DNR fisheries survey reports fish abundance and catch rates, not a water-quality grade. LakeQuality grades Long 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 1989. 5 stations on file (most recent sample 2026).
Fish Species (DNR-rated)
DNR Reports & Resources
Wisconsin DNR Fisheries scientists publish multi-year survey reports for Long Lake covering fish populations, stocking, water quality, and management. 2 reports on file.
These links open on the official state DNR websites (Wisconsin DNR survey PDFs · Minnesota DNR LakeFinder).
- 2025Long Lake spring shocking and netting survey, 2025Spring Shocking Survey · WI DNR · 2025 (PDF)
- 2021Long Lake spring survey, 2021Fisheries Survey · WI DNR · 2021 (PDF)
Lake Details
| Characteristic | Value |
|---|---|
| Maximum Depth | 101 ft |
| Surface Area | 936 acres |
| Public Access | Yes |
Lake Size & Watershed
Size, shoreline, and watershed area from HydroLAKES (HydroSHEDS).
Recreation & Access
- Morris-Erickson County ParkPublic
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 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.
Water Quality Trend: ↑ Improving
Based on 7 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Water Clarity | ↑ Improving | +0.7 m/yr | 7 |
| Phosphorus | ↑ Improving | -0.96 µg/L/yr | 7 |
County Ranking
Ranked #3 of 7 lakes in Chippewa County
Nearby Lakes in Chippewa County
Frequently asked questions about Long Lake
Where is Long Lake?
- Long Lake is a lake in Chippewa County, Wisconsin. LakeQuality grades it B for nutrients and algae. The letter is not a swimming clearance.
What is the water quality grade for Long Lake?
- Long Lake in Chippewa County, Wisconsin has a water quality grade of B (Good). Water clarity: 13.1 ft visibility. Phosphorus: 12.4 µg/L. Maximum depth: 101 ft. Surface area: 936 acres.
Is Long Lake safe to swim in?
- Based on E. coli testing, Long Lake never exceeded the EPA safe-swimming threshold (235 MPN/100mL) — on 0% of 35 samples across 3 seasons. That works out to a bacteria swim-safety grade of A — a historical summary of past testing, not a current reading. Long Lake has a water quality grade of B (Good). Bacteria levels can spike quickly after heavy rain, so always check Wisconsin's current beach and health-department advisories before you swim.
How deep is Long Lake?
- Long Lake has a maximum depth of 101 feet. The lake covers 936 acres.
What fish are in Long Lake?
- Fish species found in Long Lake include Musky, Panfish, Largemouth Bass, Smallmouth Bass, Northern Pike, Walleye. Long Lake is located in Chippewa County, Wisconsin.
What did the DNR fisheries survey find at Long Lake?
- Wisconsin DNR rates Walleye as abundant on Long Lake. A DNR fisheries survey reports fish abundance and catch rates, not a water-quality grade. LakeQuality grades Long 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.
Does Long Lake have blue-green algae?
- There is no recent EPA CyAN cyanobacteria estimate for Long Lake (clouds, ice, or an off-season gap). The most recent reading was low (12,942 cells/mL). Blue-green algae can appear and clear within days, so check Wisconsin's current advisory before swimming.
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 Morris-Erickson County Park. Public access is listed as yes.
Explore Long Lake across LakeQuality
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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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Mesotrophic Lakes in Wisconsin
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Where this data comes from
60 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_WQX60 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