Marais des Cygnes Nwr Lake
Linn County, KansasView mapDirections
Not enough samples to grade — no nutrient or algae measurement meets the evidence bar (at least 3 samples within 10 years). No letter yet. Here is what we do have.
- Limited data
Marais des Cygnes Nwr Lake in Linn County, Kansas is not rated for water quality — its monitoring record does not meet the evidence bar. Water clarity: 0.6 ft visibility. Phosphorus: 810 µg/L. Chlorophyll-a (algae): 255 µg/L.
- Clarity
- 0.6 ft
- Phosphorus
- 810 µg/L
- Chlorophyll-a
- 255 µg/L
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Stays near Marais des Cygnes Nwr Lake
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Watch Marais des Cygnes Nwr Lake’s letter
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Why Marais des Cygnes Nwr 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 Marais des Cygnes Nwr Lake, no nutrient or algae measurement meets the evidence bar (at least 3 samples within 10 years). Sampling here has recorded water clarity, 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 KDHE and volunteer programs, and published through the EPA Water Quality Portal. Read the full grading methodology.
Marais des Cygnes Nwr Lake is a lake in Linn County, Kansas.
Source: EPA Water Quality Portal sampling records, KDHE, last sampled 2014-07-08. Grade methodology: LakeQuality methodology.
Swimming Safety
Not ratedLimited data
The letter is not a swimming clearance. Check local advisories before you swim.
Water quality measurements for Marais des Cygnes Nwr Lake
These readings exist but are not enough for an A–F grade — see why.
Very murky, less than 0.6 ft of visibility. Phosphorus 810 µg/L. Chlorophyll-a 255 µg/L. TSI 90.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 0.6 ft | Not graded |
| Phosphorus | 810 µg/L | Not graded |
| Chlorophyll-a (Algae) | 255 µg/L | Not graded |
| Trophic State Index (TSI) | 90 | Hypereutrophic |
Very high nutrients, dense algae, poor clarity
Fishing Marais des Cygnes Nwr Lake
Graded lakes near Marais des Cygnes Nwr Lake
Marais des Cygnes Nwr Lake has no grade, but these lakes within a short drive do.
Nearby Lakes in Linn County
Frequently asked questions about Marais des Cygnes Nwr Lake
Where is Marais des Cygnes Nwr Lake?
- Marais des Cygnes Nwr Lake is a lake in Linn County, Kansas. LakeQuality has not rated this lake (UNRATED) — no nutrient or algae measurement meets the evidence bar (at least 3 samples within 10 years).
What is the water quality grade for Marais des Cygnes Nwr Lake?
- Marais des Cygnes Nwr Lake in Linn County, Kansas is not rated for water quality — its monitoring record does not meet the evidence bar. Water clarity: 0.6 ft visibility. Phosphorus: 810 µg/L. Chlorophyll-a (algae): 255 µg/L.
Is Marais des Cygnes Nwr Lake safe to swim in?
- The letter is not a swimming clearance. Check local advisories before you swim.
Explore Marais des Cygnes Nwr Lake across LakeQuality
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Where this data comes from
5 measurements from 1 monitoring station, 2014. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- Kansas Department Of Health And Environment
21KAN001_WQX5 samples · 2014
Analytical methods
- Depth, Secchi disk depth
- Phosphorus by Colorimetry
- 10200 H ~ Chlorophyll a-b-c Determination
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.