Mallard Lake
Morton 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.
- Impaired · Nutrients (phosphorus, nitrogen)
- Limited data
Mallard Lake in Morton County, Kansas is not rated for water quality — its monitoring record does not meet the evidence bar. Water clarity: 1.5 ft visibility. Phosphorus: 145 µg/L. Chlorophyll-a (algae): 11.4 µg/L.
- Clarity
- 1.5 ft
- Phosphorus
- 145 µg/L
- Chlorophyll-a
- 11.4 µg/L
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Watch Mallard Lake’s letter
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Why Mallard 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 Mallard 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.
Mallard Lake is a lake in Morton County, Kansas.
Source: EPA Water Quality Portal sampling records, KDHE, last sampled 2014-06-16. Grade methodology: LakeQuality methodology.
Swimming Safety
Not ratedLimited data
The letter is not a swimming clearance. Mallard 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 Mallard Lake
These readings exist but are not enough for an A–F grade — see why.
Very murky, less than 1.5 ft of visibility. Phosphorus 145 µg/L. Chlorophyll-a 11.4 µg/L. TSI 67.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 1.5 ft | Not graded |
| Phosphorus | 145 µg/L | Not graded |
| Chlorophyll-a (Algae) | 11.4 µg/L | Not graded |
| Trophic State Index (TSI) | 67 | Eutrophic |
High nutrients, frequent algae, reduced clarity
Fishing Mallard Lake
EPA Impairment Status
Mallard 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-LM060401 · Official waterbody report · Matched by proximity (2.74 km)
Nearby Lakes in Morton County
Frequently asked questions about Mallard Lake
Where is Mallard Lake?
- Mallard Lake is a lake in Morton 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 Mallard Lake?
- Mallard Lake in Morton County, Kansas is not rated for water quality — its monitoring record does not meet the evidence bar. Water clarity: 1.5 ft visibility. Phosphorus: 145 µg/L. Chlorophyll-a (algae): 11.4 µg/L.
Is Mallard Lake safe to swim in?
- The letter is not a swimming clearance. Mallard Lake is listed impaired under Clean Water Act §303(d) (IR 5) for nutrients (phosphorus, nitrogen). Check local advisories before you swim.
Explore Mallard 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.
Other records on this page
Impairment status from EPA ATTAINS 303(d) database