La Cygne Lake
Linn County, Kansas2,600 acresView 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.
- Impaired · Nutrients (phosphorus, nitrogen)
- 69 ft max depth
- Public access
- Limited data
La Cygne Lake in Linn County, Kansas is not rated for water quality — its monitoring record does not meet the evidence bar. Water clarity: 2.4 ft visibility. Phosphorus: 37 µg/L. Chlorophyll-a (algae): 56 µg/L. Surface area: 2600 acres.
- Clarity
- 2.4 ft
- Max depth
- ~69 ft est.
- Area
- 2,600 acres
- Phosphorus
- 37 µg/L
- Chlorophyll-a
- 56 µg/L
- Public access
- Yes
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Watch La Cygne Lake’s letter
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Why La Cygne 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 La Cygne 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.
La Cygne Lake is a 2,600-acre lake in Linn County, Kansas with an estimated average depth of about 69 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 2016-07-11. Grade methodology: LakeQuality methodology.
What La Cygne Lake is good for
From access and monitoring records, not editorial picks.
- Boat launch1 documented ramp
- Big water2,600 acres
Swimming Safety
Not ratedLimited data
The letter is not a swimming clearance. La Cygne Lake is listed impaired under Clean Water Act §303(d) (IR 5) for nutrients (phosphorus, nitrogen). Check local advisories before you swim.
Water quality measurements for La Cygne Lake
These readings exist but are not enough for an A–F grade — see why.
Very murky, less than 2.4 ft of visibility. Phosphorus 37 µg/L. Chlorophyll-a 56 µg/L. TSI 64.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 2.4 ft | Not graded |
| Phosphorus | 37 µg/L | Not graded |
| Chlorophyll-a (Algae) | 56 µg/L | Not graded |
| Trophic State Index (TSI) | 64 | Eutrophic |
High nutrients, frequent algae, reduced clarity
Lake Details
| Characteristic | Value |
|---|---|
| Maximum Depth | ~69 ft est. |
| Average Depth | ~38 ft est. |
| Surface Area | 2,600 acres |
| 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 La Cygne 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
- La Cygnes-EastPublic
Named access points in the USGS National Boat Ramps inventory, within about 3 miles. More lakes with boat ramps
Fishing La Cygne Lake
Reservoir Info (USACE NID)
La Cygne Lake is a man-made reservoir impounded by the Lacygne Lake Dam (completed 1971), built primarily for other on the North Sugar Creek; earth-type dam, 76 ft tall and 6,970 ft long.
- Surface area
- 2,600 ac
- Normal storage
- 40,000 ac-ft
- Max storage
- 85,000 ac-ft
- Drainage area
- 57.5 sq mi
- Hazard class
- High
- Owner
- EVERGY, INC.
All listed purposes: Other;Recreation.
Source: USACE National Inventory of Dams, NID ID KS01305 · Operator website
EPA Impairment Status
La Cygne Lake is officially listed as impaired under Clean Water Act §303(d) in the 2024 EPA reporting cycle (IR category 5).
Causes of impairment
Source: EPA ATTAINS assessment unit KS-LM044002 · Official waterbody report
Graded lakes near La Cygne Lake
La Cygne Lake has no grade, but these lakes within a short drive do.
Nearby Lakes in Linn County
Frequently asked questions about La Cygne Lake
Where is La Cygne Lake?
- La Cygne 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 La Cygne Lake?
- La Cygne Lake in Linn County, Kansas is not rated for water quality — its monitoring record does not meet the evidence bar. Water clarity: 2.4 ft visibility. Phosphorus: 37 µg/L. Chlorophyll-a (algae): 56 µg/L. Surface area: 2600 acres.
Is La Cygne Lake safe to swim in?
- The letter is not a swimming clearance. La Cygne Lake is listed impaired under Clean Water Act §303(d) (IR 5) for nutrients (phosphorus, nitrogen). Check local advisories before you swim.
How deep is La Cygne Lake?
- No published bathymetric survey covers La Cygne Lake, so its depth has not been measured. The HydroLAKES global model estimates an average depth of about 69 feet, but that is a modelled estimate derived from surrounding terrain rather than a measurement on the water, so treat it as approximate. The lake covers 2600 acres.
Are there boat ramps on La Cygne Lake?
- La Cygne Lake has 1 documented boat landing in the USGS National Boat Ramps inventory. Named access points include La Cygnes-East. Public access is listed as yes.
Explore La Cygne Lake across LakeQuality
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Where this data comes from
5 measurements from 1 monitoring station, 2016. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- Kansas Department Of Health And Environment
21KAN001_WQX5 samples · 2016
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
Impairment status from EPA ATTAINS 303(d) database
Lake size & watershed from HydroLAKES (HydroSHEDS)
Named boat-access points from the USGS National Boat Ramps inventory