Marais des Cygnes Wildlife Area 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.
- 47 ft max depth
- Public access
- Limited data
Marais des Cygnes Wildlife Area Lake in Linn County, Kansas is not rated for water quality — its monitoring record does not meet the evidence bar. Water clarity: 0.5 ft visibility. Phosphorus: 2.3 µg/L. Chlorophyll-a (algae): 454 µg/L.
- Clarity
- 0.5 ft
- Max depth
- ~47 ft est.
- Phosphorus
- 2.3 µg/L
- Chlorophyll-a
- 454 µg/L
- Public access
- Yes
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Why Marais des Cygnes Wildlife Area 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 Wildlife Area 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 Wildlife Area Lake is a lake in Linn County, Kansas with an estimated average depth of about 47 feet. Limited fish-species data available. Public access is available with 1 public boat landing.
Source: EPA Water Quality Portal sampling records, KDHE, last sampled 2018-07-24. Grade methodology: LakeQuality methodology.
What Marais des Cygnes Wildlife Area Lake is good for
From access and monitoring records, not editorial picks.
- Boat launch1 documented ramp
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 Wildlife Area Lake
These readings exist but are not enough for an A–F grade — see why.
Very murky, less than 0.5 ft of visibility. Phosphorus 2.3 µg/L. Chlorophyll-a 454 µg/L. TSI 65.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 0.5 ft | Not graded |
| Phosphorus | 2.3 µg/L | Not graded |
| Chlorophyll-a (Algae) | 454 µg/L | Not graded |
| Trophic State Index (TSI) | 65 | Eutrophic |
High nutrients, frequent algae, reduced clarity
Lake Details
| Characteristic | Value |
|---|---|
| Maximum Depth | ~47 ft est. |
| Average Depth | ~17 ft est. |
| Public Access | Yes |
Depth marked “est.” is a modeled maximum from GLOBathy (Khazaei et al. 2022, CC0), not a measured survey. Kansas has not published bathymetry for Marais des Cygnes Wildlife Area Lake.
Lake Size & Watershed
Size, shoreline, and watershed area from HydroLAKES (HydroSHEDS). Mean depth here is modelled, not surveyed — HydroLAKES v1.0 estimates lake depth from surrounding terrain rather than from soundings. Treat it as an approximation, and prefer a state bathymetric survey where one exists.
Recreation & Access
- Unit G-SouthPublic
Named access points in the USGS National Boat Ramps inventory, within about 3 miles. More lakes with boat ramps
Fishing Marais des Cygnes Wildlife Area Lake
Graded lakes near Marais des Cygnes Wildlife Area Lake
Marais des Cygnes Wildlife Area Lake has no grade, but these lakes within a short drive do.
Nearby Lakes in Linn County
Frequently asked questions about Marais des Cygnes Wildlife Area Lake
Where is Marais des Cygnes Wildlife Area Lake?
- Marais des Cygnes Wildlife Area 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 Wildlife Area Lake?
- Marais des Cygnes Wildlife Area Lake in Linn County, Kansas is not rated for water quality — its monitoring record does not meet the evidence bar. Water clarity: 0.5 ft visibility. Phosphorus: 2.3 µg/L. Chlorophyll-a (algae): 454 µg/L.
Is Marais des Cygnes Wildlife Area Lake safe to swim in?
- The letter is not a swimming clearance. Check local advisories before you swim.
How deep is Marais des Cygnes Wildlife Area Lake?
- No published bathymetric survey covers Marais des Cygnes Wildlife Area Lake, so its depth has not been measured. The HydroLAKES global model estimates an average depth of about 47 feet, but that is a modelled estimate derived from surrounding terrain rather than a measurement on the water, so treat it as approximate.
Are there boat ramps on Marais des Cygnes Wildlife Area Lake?
- Marais des Cygnes Wildlife Area Lake has 1 documented boat landing in the USGS National Boat Ramps inventory. Named access points include Unit G-South. Public access is listed as yes.
Explore Marais des Cygnes Wildlife Area Lake across LakeQuality
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Where this data comes from
4 measurements from 1 monitoring station, 2018. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- Kansas Department Of Health And Environment
21KAN001_WQX4 samples · 2018
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.
Other records on this page
Lake size & watershed from HydroLAKES (HydroSHEDS)
Named boat-access points from the USGS National Boat Ramps inventory