St Jacobs Well Lake
Clark County, KansasView mapDirections
KDHE publishes the water-quality measurements for St Jacobs Well Lake. Here is what has been measured.
- Impaired · Nutrients (phosphorus, nitrogen)
- Limited data
St Jacobs Well Lake in Clark County, Kansas has water-quality measurements published by KDHE, shown here as reported. Water clarity: 5.2 ft visibility. Phosphorus: 27.5 µg/L. Chlorophyll-a (algae): 3.6 µg/L.
St Jacobs Well Lake is a lake in Clark County, Kansas.
Source: EPA Water Quality Portal sampling records, KDHE, last sampled 2014-06-17. Methodology: how these readings are compared.
Swimming conditions
No readingRecreation use not supported
Nutrient and algae readings are not a swimming clearance. St Jacobs Well Lake is listed impaired under Clean Water Act §303(d) (IR 4A) for nutrients (phosphorus, nitrogen). Check local advisories before you swim.
Whether St Jacobs Well 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 St Jacobs Well Lake
These are the measurements KDHE publishes for St Jacobs Well Lake, shown as reported. The condition class beside each reading is the EPA National Lakes Assessment class for this lake’s ecoregion.
Murky, only visible to about 5.2 ft. Phosphorus 27.5 µg/L. Chlorophyll-a 3.6 µg/L. TSI 49.
| Measure | Reading | Where it sits |
|---|---|---|
| Water clarity (Secchi depth) | 5.2ft | Measured, not scored How deep a black-and-white disk stays visible from the surface. Higher is clearer. |
| Total phosphorus | 27.5µg/L | Measured, not scored The nutrient that most limits algae growth in freshwater. More phosphorus, more algae potential. |
| Chlorophyll-a (algae) | 3.6µg/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. | 49 | Mesotrophic OligotrophicMesotrophicEutrophicHypereutrophic |
Moderate nutrients, good water quality
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EPA Impairment Status
St Jacobs Well Lake is officially listed as impaired under Clean Water Act §303(d) in the 2024 EPA reporting cycle (IR category 4A).
Causes of impairment
Designated uses not supporting: Drinking water, Aquatic life, Recreation.
A Total Maximum Daily Load (TMDL) plan has been approved.
Source: EPA ATTAINS assessment unit KS-LM060001 · Official waterbody report
Nearby Lakes in Clark County
Frequently asked questions about St Jacobs Well Lake
Where is St Jacobs Well Lake?
- St Jacobs Well Lake is a lake in Clark County, Kansas. Its water-quality measurements are published by KDHE and shown on this page as reported.
What is the water quality of St Jacobs Well Lake?
- St Jacobs Well Lake in Clark County, Kansas has water-quality measurements published by KDHE, shown here as reported. Water clarity: 5.2 ft visibility. Phosphorus: 27.5 µg/L. Chlorophyll-a (algae): 3.6 µg/L.
Is St Jacobs Well Lake safe to swim in?
- Nutrient and algae readings are not a swimming clearance. St Jacobs Well Lake is listed impaired under Clean Water Act §303(d) (IR 4A) for nutrients (phosphorus, nitrogen). 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.
Other records on this page
Impairment status from EPA ATTAINS 303(d) database