Little Long Lake
Forest County, Wisconsin101 acresView mapDirections
Wisconsin DNR publishes the water-quality measurements for Little Long Lake. Here is what has been measured.
- Purple Loosestrife
- 30 ft max depth
- Public access
- Limited data
Little Long Lake in Forest County, Wisconsin has water-quality measurements published by Wisconsin DNR, shown here as reported. Water clarity: 13.1 ft visibility. Maximum depth: 30 ft. Surface area: 101 acres.
Wisconsin DNR lists Panfish as common on Little Long Lake. DNR survey details →
Little Long Lake is a 101-acre lake in Forest County, Wisconsin with a maximum depth of 30 feet. Overall water quality is declining over recent sampling years. The lake supports 3 documented fish species including Panfish, Largemouth Bass, and Northern Pike. Public access is available.
Source: EPA Water Quality Portal sampling records, Wisconsin DNR Surface Water, last sampled 2025-08-27. Methodology: how these readings are compared.
What Little Long Lake is good for
From access and monitoring records, not editorial picks.
- Clear water13.1 ft of visibility
- Fishing3 species recorded
- Deep water30 ft surveyed max depth
Swimming conditions
No readingLimited data
Nutrient and algae readings are not a swimming clearance. Check local advisories before you swim.
Whether Little Long Lake is safe to swim in today is a call for the Wisconsin Department of Natural Resources and the county health department, who post current advisories. LakeQuality does not issue swimming clearances.
Water quality measurements for Little Long Lake
These are the measurements Wisconsin DNR publishes for Little Long Lake, shown as reported. The condition class beside each reading is the EPA National Lakes Assessment class for this lake’s ecoregion.
Good clarity, visible to about 13.1 ft. TSI 40.
| Measure | Reading | Where it sits |
|---|---|---|
| Water clarity (Secchi depth) | 13.1ft | Measured, not scored How deep a black-and-white disk stays visible from the surface. Higher is clearer. |
| Total phosphorus | No reading The nutrient that most limits algae growth in freshwater. More phosphorus, more algae potential. | |
| Chlorophyll-a (algae) | No reading The green pigment in algae — a direct measure of how much algae is in the water. | |
| Trophic state (TSI)Carlson's 0–100 index of how much algae a lake can support, from clarity, phosphorus and chlorophyll-a. | 40 | Mesotrophic OligotrophicMesotrophicEutrophicHypereutrophic |
Moderate nutrients, good water quality
Ask about Little Long Lake
Answers come straight from the public measurements and survey records on this page.
Water Temperature
Little Long Lake typically sits around 73°F at the surface in September. Summer average is about 74°F. Usually warmest in Jul (about 76°F) and coldest in May (about 63°F). These are typical values by month — not a live reading.
Column height runs from this lake’s coldest month (63°F) to its warmest (76°F).
Typical surface water temperature by month, from 28 field readings (2024–2025) via the EPA Water Quality Portal. See the full Little Long Lake water temperature breakdown →
Wisconsin DNR lists Panfish as common on Little Long Lake.
A DNR fisheries survey reports fish abundance and catch rates, not water quality. LakeQuality shows Little Long Lake’s water-quality measurements separately, and the water-quality trend over 2 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 1994. 1 station on file (most recent sample 2025).
Fish Species (DNR-rated)
Lake Details
Max depth
30 ft
Surface area
101 acres
Public access
Yes
Listed by Wisconsin DNR
Lake Size & Watershed
Watershed (drainage) area
1 sq mi
HydroLAKES / HydroSHEDS
Shoreline
2.1 mi
HydroLAKES / HydroSHEDS
Elevation
1,568 ft
Size, shoreline, and watershed area from HydroLAKES (HydroSHEDS).
Stays via Stay22
Stays near Little Long Lake
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Top-rated places to stay near Little Long Lake
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Follow Little Long Lake’s readings
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Fish Species
Click a species to see every lake where it is documented.
Fishing Little Long Lake
- → Little Long Lake fishing: DNR survey catch rates, species & stocking
- → Little Long Lake fishing forecast & best times (species outlook + 14-day solunar calendar)
- → Little Long Lake fishing regulations (limits, seasons, special rules)
- → Is it safe to eat fish from Little Long Lake? (mercury & PFAS guide)
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 readings over time
2 seasons of samples on record (2024–2025). Calling a direction takes at least 4 years of the same measurement.
Water clarity
Worsening2 years
Regulated Pollution Sources Nearby
1 EPA-permitted facility operate within about 5 miles of Little Long Lake under Clean Water Act (NPDES) discharge permits.
- Forest Sanitary District No 1Forest · 1.8 mi away · NPDES WI0060747
Facilities permitted to discharge under the Clean Water Act within ~5 miles; proximity does not by itself mean a facility affects this lake. Source: EPA ECHO (ICIS-NPDES), as of 2026-07.
Nearby Lakes in Forest County
Frequently asked questions about Little Long Lake
Where is Little Long Lake?
- Little Long Lake is a lake in Forest County, Wisconsin. Its water-quality measurements are published by Wisconsin DNR and shown on this page as reported.
What is the water quality of Little Long Lake?
- Little Long Lake in Forest County, Wisconsin has water-quality measurements published by Wisconsin DNR, shown here as reported. Water clarity: 13.1 ft visibility. Maximum depth: 30 ft. Surface area: 101 acres.
Is Little Long Lake safe to swim in?
- Nutrient and algae readings are not a swimming clearance. Check local advisories before you swim.
What is the water temperature of Little Long Lake?
- Little Long Lake typically sits around 73°F at the surface in September, from 28 EPA Water Quality Portal field readings (2024–2025). That is a typical value for the month, not a live reading.
How deep is Little Long Lake?
- Little Long Lake has a maximum depth of 30 feet. The lake covers 101 acres.
What fish are in Little Long Lake?
- Fish species found in Little Long Lake include Panfish, Largemouth Bass, Northern Pike. Little Long Lake is located in Forest County, Wisconsin.
What did the DNR fisheries survey find at Little Long Lake?
- Wisconsin DNR lists Panfish as common on Little Long Lake. A DNR fisheries survey reports fish abundance and catch rates, not water quality. LakeQuality shows Little Long Lake’s water-quality measurements separately, and the water-quality trend over 2 years of monitoring is declining. Catch rate is not a swim clearance and is not a weekly bite report.
Can I fish at Little Long Lake?
- Public access to Little Long Lake is listed as yes on the lake record. Seasons, size and bag limits, and whether you need a license are set by Wisconsin's fish and wildlife agency, so check its current regulations before you go.
Explore Little Long Lake across LakeQuality
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Where this data comes from
23 measurements from 1 monitoring station, 2024–2025. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- Wisconsin Department of Natural Resources
WIDNR_WQX23 samples · 2024–2025
Monitoring station identifiers (1)
EPA condition classes from the National Lakes Assessment (EPA 841-R-24-006, Table 6-3), applied by ecoregion. See where the data comes from and data sources.
Other records on this page
Regulated discharger data from EPA ECHO (ICIS-NPDES)
Lake size & watershed from HydroLAKES (HydroSHEDS)
Fish and recreation data from Wisconsin DNR Lakes