Marais des Cygnes Nwr Lake
Linn County, KansasView mapDirections
KDHE publishes the water-quality measurements for Marais des Cygnes Nwr Lake. Here is what has been measured.
- Limited data
Marais des Cygnes Nwr Lake in Linn County, Kansas has water-quality measurements published by KDHE, shown here as reported. Water clarity: 0.6 ft visibility. Phosphorus: 810 µg/L. Chlorophyll-a (algae): 255 µg/L.
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. Methodology: how these readings are compared.
Swimming conditions
No readingLimited data
Nutrient and algae readings are not a swimming clearance. Check local advisories before you swim.
Whether Marais des Cygnes Nwr Lake is safe to swim in today is a call for the Kansas Department of Health and Environment and the county health department, who post current advisories. LakeQuality does not issue swimming clearances.
Water quality measurements for Marais des Cygnes Nwr Lake
These are the measurements KDHE publishes for Marais des Cygnes Nwr Lake, shown as reported. The condition class beside each reading is the EPA National Lakes Assessment class for this lake’s ecoregion.
Very murky, less than 0.6 ft of visibility. Phosphorus 810 µg/L. Chlorophyll-a 255 µg/L. TSI 90.
| Measure | Reading | Where it sits |
|---|---|---|
| Water clarity (Secchi depth) | 0.6ft | Measured, not scored How deep a black-and-white disk stays visible from the surface. Higher is clearer. |
| Total phosphorus | 810µg/L | Measured, not scored The nutrient that most limits algae growth in freshwater. More phosphorus, more algae potential. |
| Chlorophyll-a (algae) | 255µg/L | Measured, not scored The green pigment in algae — a direct measure of how much algae is in the water. |
| Trophic state (TSI)Carlson's 0–100 index of how much algae a lake can support, from clarity, phosphorus and chlorophyll-a. | 90 | Hypereutrophic OligotrophicMesotrophicEutrophicHypereutrophic |
Very high nutrients, dense algae, poor clarity
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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. Its water-quality measurements are published by KDHE and shown on this page as reported.
What is the water quality of Marais des Cygnes Nwr Lake?
- Marais des Cygnes Nwr Lake in Linn County, Kansas has water-quality measurements published by KDHE, shown here as reported. 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?
- Nutrient and algae readings are not a swimming clearance. Check local advisories before you swim.
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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)
EPA condition classes from the National Lakes Assessment (EPA 841-R-24-006, Table 6-3), applied by ecoregion. See where the data comes from and data sources.