Montgomery Lake
Montgomery Lake in Florence County, Wisconsin is not rated for water quality — its monitoring record does not meet the evidence bar. Water clarity: 6.8 ft visibility.
- Clarity
- 6.8 ft
- Trend
- ↑ Improving
- Public access
- Yes
Next lake in Florence County
Why Montgomery 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 Montgomery 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.
Montgomery Lake is a lake in Florence County, Wisconsin. Overall water quality is improving over recent sampling years. Limited fish-species data available. Public access is available with 1 public boat landing.
Source: EPA Water Quality Portal sampling records, Wisconsin DNR Surface Water, last sampled 2023-07-14. 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 Montgomery Lake
These readings exist but do not meet the evidence bar for an A–F grade — see why.
Moderate clarity, visible to about 6.8 ft. Trophic State Index: 50.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 6.8 ft | Not graded |
| Phosphorus | No recent samples | |
| Chlorophyll-a (Algae) | No recent samples | |
| Trophic State Index (TSI) | 50 | Mesotrophic |
Moderate nutrients, good water quality
Where to stay near Montgomery Lake
Compare lakeside cabins, hotels, and vacation rentals near Montgomery Lake in Florence 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 Montgomery Lake
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Recreation & Access
- Woods RoadPublic
Fishing Montgomery Lake
Water Quality Trend: ↑ Improving
Based on 7 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Water Clarity | ↑ Improving | +0.55 m/yr | 7 |
Nearby Lakes in Florence County
Frequently asked questions about Montgomery Lake
What is the water quality grade for Montgomery Lake?
- Montgomery Lake in Florence County, Wisconsin is not rated for water quality — its monitoring record does not meet the evidence bar. Water clarity: 6.8 ft visibility.
Is Montgomery Lake safe to swim in?
- Not rated for swimming — there is not enough monitoring data to judge this lake. Montgomery Lake is not rated for water quality — its monitoring record does not meet the evidence bar. Always check local health department advisories before swimming.
Are there boat ramps on Montgomery Lake?
- Montgomery Lake has 1 documented boat landing in the USGS National Boat Ramps inventory. Named access points include Woods Road. Public access is listed as yes.
Explore Montgomery Lake across LakeGrade
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Where this data comes from
3 measurements from 2 monitoring stations, 2022–2023. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- Wisconsin Department of Natural Resources
WIDNR_WQX3 samples · 2022–2023
Monitoring station identifiers (2)
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
Named boat-access points from the USGS National Boat Ramps inventory