Meder Lake
Meder Lake in Ashland County, Wisconsin is not rated for water quality — its monitoring record does not meet the evidence bar. Water clarity: 3.6 ft visibility. Maximum depth: 10 ft. Surface area: 135 acres.
- Clarity
- 3.6 ft
- Max depth
- 10 ft
- Area
- 135 acres
- Public access
- Yes
Next lake in Ashland County
Why Meder 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 Meder Lake, no nutrient or algae measurement meets the evidence bar (at least 3 samples within 10 years). 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.
Meder Lake is a 135-acre lake in Ashland County, Wisconsin with a maximum depth of 10 feet. The lake supports 4 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 2022-07-28. 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 Meder Lake
These readings exist but do not meet the evidence bar for an A–F grade — see why.
Murky, only visible to about 3.6 ft. Trophic State Index: 58.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 3.6 ft | Not graded |
| Phosphorus | No recent samples | |
| Chlorophyll-a (Algae) | No recent samples | |
| Trophic State Index (TSI) | 58 | Eutrophic |
High nutrients, frequent algae, reduced clarity
Where to stay near Meder Lake
Compare lakeside cabins, hotels, and vacation rentals near Meder Lake in Ashland 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 Meder Lake
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Lake Details
| Characteristic | Value |
|---|---|
| Maximum Depth | 10 ft |
| Surface Area | 135 acres |
| Public Access | Yes |
Recreation & Access
- Meder LakePublic
- Long LakePublic
Fish Species
Click a species to see every graded lake where it is documented.
Fishing Meder 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. 3 stations on file (most recent sample 2025).
Fish Species (DNR-rated)
Regulated Pollution Sources Nearby
2 EPA-permitted facilities operate within about 5 miles of Meder Lake under Clean Water Act (NPDES) discharge permits. 1 facility has a reported Clean Water Act violation in the past three years.
- Mellen City OfMellen · 3.6 mi away · NPDES WI0020311Recent violation
- Wi Dnr Copper Falls State ParkClam Falls · 3.6 mi away · NPDES WI0030449
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 Meder Lake
Meder Lake has no grade, but these lakes within a short drive do.
Nearby Lakes in Ashland County
Frequently asked questions about Meder Lake
What is the water quality grade for Meder Lake?
- Meder Lake in Ashland County, Wisconsin is not rated for water quality — its monitoring record does not meet the evidence bar. Water clarity: 3.6 ft visibility. Maximum depth: 10 ft. Surface area: 135 acres.
Is Meder Lake safe to swim in?
- Not rated for swimming — there is not enough monitoring data to judge this lake. Meder Lake is not rated for water quality — its monitoring record does not meet the evidence bar. Always check local health department advisories before swimming.
How deep is Meder Lake?
- Meder Lake has a maximum depth of 10 feet. The lake covers 135 acres.
What fish are in Meder Lake?
- Fish species found in Meder Lake include Panfish, Largemouth Bass, Northern Pike, Walleye. Meder Lake is located in Ashland County, Wisconsin.
Are there boat ramps on Meder Lake?
- Meder Lake has 2 documented boat landings in the USGS National Boat Ramps inventory. Named access points include Meder Lake, Long Lake. Public access is listed as yes.
Explore Meder Lake across LakeGrade
3 documented falls within 13.9 mi, nearest Brownstone Falls
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Where this data comes from
1 measurement from 1 monitoring station, 2022. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- Wisconsin Department of Natural Resources
WIDNR_WQX1 sample · 2022
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)
Fish and recreation data from Wisconsin DNR Lakes
Named boat-access points from the USGS National Boat Ramps inventory