Armstrong Lake
Armstrong Lake in Leelanau County, Michigan is not rated for water quality — its monitoring record does not meet the evidence bar. Water clarity: 11.5 ft visibility. Surface area: 40.8 acres.
- Clarity
- 11.5 ft
- Area
- 41 acres
- Public access
- Yes
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Why Armstrong 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 Armstrong 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 EGLE and volunteer programs, and published through the EPA Water Quality Portal. Read the full grading methodology.
Armstrong Lake is a 41-acre lake in Leelanau County, Michigan. Limited fish-species data available. Public access is available with 1 public boat landing.
Source: EPA Water Quality Portal sampling records, EGLE, last sampled 2019-09-08. Grade methodology: LakeQuality methodology.
Watch Armstrong Lake water quality
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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 Armstrong Lake
These readings exist but are not enough for an A–F grade — see why.
Good clarity, visible to about 11.5 ft. Trophic State Index: 42.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 11.5 ft | Not graded |
| Phosphorus | No recent samples | |
| Chlorophyll-a (Algae) | No recent samples | |
| Trophic State Index (TSI) | 42 | Mesotrophic |
Moderate nutrients, good water quality
Where to stay near Armstrong Lake
Compare lakeside cabins, hotels, and vacation rentals near Armstrong Lake in Leelanau County, Michigan — 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 Armstrong Lake
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Lake Details
| Characteristic | Value |
|---|---|
| Surface Area | 41 acres |
| Public Access | Yes |
No bathymetric survey has been published for Armstrong Lake, so its depth is not documented here.
Recreation & Access
Fishing Armstrong Lake
Graded lakes near Armstrong Lake
Armstrong Lake has no grade, but these lakes within a short drive do.
Nearby Lakes in Leelanau County
Frequently asked questions about Armstrong Lake
Where is Armstrong Lake?
- Armstrong Lake is a lake in Leelanau County, Michigan. LakeQuality has not rated this lake (UNRATED) — there is not enough recent sampling to assign a letter.
What is the water quality grade for Armstrong Lake?
- Armstrong Lake in Leelanau County, Michigan is not rated for water quality — its monitoring record does not meet the evidence bar. Water clarity: 11.5 ft visibility. Surface area: 40.8 acres.
Is Armstrong Lake safe to swim in?
- Not rated for swimming — there is not enough monitoring data to judge this lake. Armstrong 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 Armstrong Lake?
- Armstrong Lake has 1 documented boat landing in the USGS National Boat Ramps inventory. Public access is listed as yes.
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Where this data comes from
8 measurements from 1 monitoring station, 2019. Retrieved from the EPA Water Quality Portal on 2026-08-26.
Collected and reported by
- North American Lake Management Society
NALMS8 samples · 2019
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
Named boat-access points from the USGS National Boat Ramps inventory