Yenruogis Pond
Keokuk County, IowaView mapDirections
Iowa DNR publishes the water-quality measurements for Yenruogis Pond. Here is what has been measured.
- Mesotrophic
Yenruogis Pond in Keokuk County, Iowa has water-quality measurements published by Iowa DNR, shown here as reported. Water clarity: 9.9 ft visibility. Phosphorus: 21 µg/L. Chlorophyll-a (algae): 6.2 µg/L.
Yenruogis Pond is a mesotrophic lake in Keokuk County, Iowa. Overall water quality is improving over recent sampling years. Compared to the 1 other monitored lakes in Keokuk County, Yenruogis Pond ranks #1 for water quality.
Source: EPA Water Quality Portal sampling records, Iowa DNR, last sampled 2024-09-09. Methodology: how these readings are compared.
What Yenruogis Pond is good for
From access and monitoring records, not editorial picks.
- Clear water9.9 ft of visibility
Swimming conditions
Readings onlyLow algae
Based on clarity and algae readings from past sampling — there is no live water temperature and a current cyanobacteria reading for this lake. Check your state or county health department before you swim.
Nutrient and algae readings are not a swimming clearance. Check local advisories before you swim.
Whether Yenruogis Pond is safe to swim in today is a call for the Iowa Department of Natural Resources and the county health department, who post current advisories. LakeQuality does not issue swimming clearances.
Water quality measurements for Yenruogis Pond
These are the measurements Iowa DNR publishes for Yenruogis Pond, shown as reported. The condition class beside each reading is the EPA National Lakes Assessment class for this lake’s ecoregion.
Good clarity, visible to about 9.9 ft. Phosphorus 21 µg/L. Chlorophyll-a 6.2 µg/L. TSI 47.
| Measure | Reading | Where it sits |
|---|---|---|
| Water clarity (Secchi depth) | 9.9ft | Measured, not scored How deep a black-and-white disk stays visible from the surface. Higher is clearer. |
| Total phosphorus | 21µg/L | Good GoodFairPoor |
| Chlorophyll-a (algae) | 6.2µg/L | Good GoodFairPoor |
| Trophic state (TSI)Carlson's 0–100 index of how much algae a lake can support, from clarity, phosphorus and chlorophyll-a. | 47 | Mesotrophic OligotrophicMesotrophicEutrophicHypereutrophic |
Moderate nutrients, good water quality
Ask about Yenruogis Pond
Answers come straight from the public measurements and survey records on this page.
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Fishing Yenruogis Pond
Water quality readings over time
2 seasons of samples on record (2023–2024). Calling a direction takes at least 4 years of the same measurement.
Water clarity
Improving2 years
Phosphorus
Worsening+4.5 µg/L/yr2 years
Chlorophyll-a
Improving-7.8 µg/L/yr2 years
Regulated Pollution Sources Nearby
1 EPA-permitted facility operate within about 5 miles of Yenruogis Pond under Clean Water Act (NPDES) discharge permits. 1 facility has a reported Clean Water Act violation in the past three years.
- Sigourney City Of Stp (East)Sigourney · 3.2 mi away · NPDES IA0036595Recent violation
Facilities permitted to discharge under the Clean Water Act within ~5 miles; proximity does not by itself mean a facility affects this lake. Source: EPA ECHO (ICIS-NPDES), as of 2026-07.
Nearby Lakes in Keokuk County
Frequently asked questions about Yenruogis Pond
Where is Yenruogis Pond?
- Yenruogis Pond is a lake in Keokuk County, Iowa. Its water-quality measurements are published by Iowa DNR and shown on this page as reported.
What is the water quality of Yenruogis Pond?
- Yenruogis Pond in Keokuk County, Iowa has water-quality measurements published by Iowa DNR, shown here as reported. Water clarity: 9.9 ft visibility. Phosphorus: 21 µg/L. Chlorophyll-a (algae): 6.2 µg/L.
Is Yenruogis Pond safe to swim in?
- Nutrient and algae readings are not a swimming clearance. Check local advisories before you swim.
Explore Yenruogis Pond across LakeQuality
More lakes in Iowa
Other Lakes in Iowa
Mesotrophic Lakes in Iowa
Where this data comes from
29 measurements from 1 monitoring station, 2023–2024. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- Iowa DNR Surface Water Monitoring Data
21IOWA_WQX29 samples · 2023–2024
Analytical methods
- Unknown
- Phosphorus by Colorimetry
- In-Vitro Determination of Chlorophyll
- ISU modification of APHA 2130-B
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
Regulated discharger data from EPA ECHO (ICIS-NPDES)