Little Long Lake
Little Long Lake in Forest County, Wisconsin is not rated for water quality — its monitoring record does not meet the evidence bar. Water clarity: 13.1 ft visibility. Maximum depth: 30 ft. Surface area: 101 acres.
- Clarity
- 13.1 ft
- Typical in August
- 75°F
- Max depth
- 30 ft
- Area
- 101 acres
- Trend
- ↓ Declining
- Public access
- Yes
Next lake in Forest County
Why Little Long Lake has no grade
We grade a lake only when its monitoring record clears the evidence bar: at least three phosphorus or chlorophyll-a samples in the last ten years, scored against EPA National Lakes Assessment thresholds for this lake’s ecoregion. For Little Long Lake, the only measurement available is water clarity, which is not a water-quality indicator on its own — EPA's National Lakes Assessment does not grade clarity. Sampling here has recorded water clarity, but not phosphorus and algae (chlorophyll-a).
Not Rated is not an F. It is EPA Integrated Reporting Category 3 — insufficient information. The water here may be excellent or poor; nobody has measured enough of it to say. Everything below that has been measured is still reported on this page.
Sampling is run by WI DNR and volunteer programs, and published through the EPA Water Quality Portal. Read the full grading methodology.
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 with 2 public boat landings.
Source: EPA Water Quality Portal sampling records, Wisconsin DNR Surface Water, last sampled 2025-08-27. Grade methodology: LakeGrade methodology.
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Swimming Safety
Not ratedLimited data
Not rated for swimming — there is not enough monitoring data to judge this lake
Water quality measurements for Little Long Lake
These readings exist but do not meet the evidence bar for an A–F grade — see why.
Good clarity, visible to about 13.1 ft. Trophic State Index: 40.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 13.1 ft | Not graded |
| Phosphorus | No recent samples | |
| Chlorophyll-a (Algae) | No recent samples | |
| Trophic State Index (TSI) | 40 | Mesotrophic |
Moderate nutrients, good water quality
Where to stay near Little Long Lake
Compare lakeside cabins, hotels, and vacation rentals near Little Long Lake in Forest 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 Little Long Lake
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Water Temperature
Little Long Lake typically sits around 75°F at the surface in August. 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.
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 →
Lake Details
| Characteristic | Value |
|---|---|
| Maximum Depth | 30 ft |
| Surface Area | 101 acres |
| Public Access | Yes |
Lake Size & Watershed
Size, shoreline, and watershed area from HydroLAKES (HydroSHEDS).
Recreation & Access
- Richardson LakePublic
- Shoe LakePublic
Fish Species
Click a species to see every graded lake where it is documented.
Fishing Little 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 1994. 1 station on file (most recent sample 2025).
Fish Species (DNR-rated)
Water Quality Trend: ↓ Declining
Based on 2 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Water Clarity | ↓ Declining | -1.88 m/yr | 2 |
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.
Graded lakes near Little Long Lake
Little Long Lake has no grade, but these lakes within a short drive do.
Nearby Lakes in Forest County
Frequently asked questions about Little Long Lake
What is the water quality grade for Little Long Lake?
- Little Long Lake in Forest County, Wisconsin is not rated for water quality — its monitoring record does not meet the evidence bar. Water clarity: 13.1 ft visibility. Maximum depth: 30 ft. Surface area: 101 acres.
Is Little Long Lake safe to swim in?
- Not rated for swimming — there is not enough monitoring data to judge this lake. Little Long Lake is not rated for water quality — its monitoring record does not meet the evidence bar. Always check local health department advisories before swimming.
What is the water temperature of Little Long Lake?
- Little Long Lake typically sits around 75°F at the surface in August, 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.
Are there boat ramps on Little Long Lake?
- Little Long Lake has 2 documented boat landings in the USGS National Boat Ramps inventory. Named access points include Richardson Lake, Shoe Lake. Public access is listed as yes.
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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)
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
Regulated discharger data from EPA ECHO (ICIS-NPDES)
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