Montana Lake
Montana Lake in Marinette County, Wisconsin is not rated for water quality — its monitoring record does not meet the evidence bar. Water clarity: 8 ft visibility. Phosphorus: 17.5 µg/L. Maximum depth: 28 ft. Surface area: 143 acres.
Wisconsin DNR lists Panfish as present on Montana Lake. DNR survey details →
- Clarity
- 8 ft
- Max depth
- 28 ft
- Area
- 143 acres
- Public access
- Yes
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Why Montana Lake has no grade
We grade a lake only when the monitoring record supports a letter: 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 Montana Lake, no nutrient or algae measurement meets the evidence bar (at least 3 samples within 10 years). Sampling here has recorded water clarity and phosphorus, but not 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.
Montana Lake is a 143-acre lake in Marinette County, Wisconsin with a maximum depth of 28 feet. 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 2025-07-24. Grade methodology: LakeQuality 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 Montana Lake
These readings exist but are not enough for an A–F grade — see why.
Moderate clarity, visible to about 8 ft. Phosphorus level: 17.5 µg/L. Trophic State Index: 46.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 8 ft | Not graded |
| Phosphorus | 17.5 µg/L | Not graded |
| Chlorophyll-a (Algae) | No recent samples | |
| Trophic State Index (TSI) | 46 | Mesotrophic |
Moderate nutrients, good water quality
Where to stay near Montana Lake
Compare lakeside cabins, hotels, and vacation rentals near Montana Lake in Marinette 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 Montana 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 →
Wisconsin DNR lists Panfish as present on Montana Lake.
A DNR fisheries survey reports fish abundance and catch rates, not a water-quality grade. LakeQuality does not assign an A–F grade on Montana Lake — official chemistry is on file, not a letter. 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. 1 station on file (most recent sample 2025).
Fish Species (DNR-rated)
Lake Details
| Characteristic | Value |
|---|---|
| Maximum Depth | 28 ft |
| Surface Area | 143 acres |
| Public Access | Yes |
Lake Size & Watershed
Size, shoreline, and watershed area from HydroLAKES (HydroSHEDS).
Recreation & Access
- Montana LakePublic
- Rost LakePublic
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 Montana 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.
Regulated Pollution Sources Nearby
1 EPA-permitted facility operate within about 5 miles of Montana Lake under Clean Water Act (NPDES) discharge permits.
- Coleman Ponderosa LlcPound, Town Of · 2.5 mi away · NPDES WI0064912
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 Montana Lake
Montana Lake has no grade, but these lakes within a short drive do.
Nearby Lakes in Marinette County
Frequently asked questions about Montana Lake
Where is Montana Lake?
- Montana Lake is a lake in Marinette County, Wisconsin. LakeQuality has not rated this lake (UNRATED) — there is not enough recent sampling to assign a letter.
What is the water quality grade for Montana Lake?
- Montana Lake in Marinette County, Wisconsin is not rated for water quality — its monitoring record does not meet the evidence bar. Water clarity: 8 ft visibility. Phosphorus: 17.5 µg/L. Maximum depth: 28 ft. Surface area: 143 acres.
Is Montana Lake safe to swim in?
- Not rated for swimming — there is not enough monitoring data to judge this lake. Montana 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 Montana Lake?
- Montana Lake has a maximum depth of 28 feet. The lake covers 143 acres.
What fish are in Montana Lake?
- Fish species found in Montana Lake include Panfish, Largemouth Bass, Northern Pike. Montana Lake is located in Marinette County, Wisconsin.
What did the DNR fisheries survey find at Montana Lake?
- Wisconsin DNR lists Panfish as present on Montana Lake. A DNR fisheries survey reports fish abundance and catch rates, not a water-quality grade. LakeQuality does not assign an A–F grade on Montana Lake — official chemistry is on file, not a letter. Catch rate is not a swim clearance and is not a weekly bite report.
Are there boat ramps on Montana Lake?
- Montana Lake has 2 documented boat landings in the USGS National Boat Ramps inventory. Named access points include Montana Lake, Rost Lake. Public access is listed as yes.
Explore Montana Lake across LakeQuality
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Where this data comes from
3 measurements from 1 monitoring station, 2025. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- Wisconsin Department of Natural Resources
WIDNR_WQX3 samples · 2025
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
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