Lake Tishomingo
Jefferson County, MissouriView mapDirections
Missouri DNR publishes the water-quality measurements for Lake Tishomingo. Here is what has been measured.
- Eutrophic
- 31 ft max depth
Ask about Lake Tishomingo
Answers come straight from the public measurements and survey records on this page.
Lake Tishomingo in Jefferson County, Missouri has water-quality measurements published by Missouri DNR, shown here as reported. Water clarity: 5.4 ft visibility. Phosphorus: 23.5 µg/L. Chlorophyll-a (algae): 7.1 µg/L.
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Lake Tishomingo is a productive, nutrient-rich eutrophic lake in Jefferson County, Missouri with an estimated average depth of about 31 feet. Overall water quality is improving over recent sampling years. Compared to the 3 other monitored lakes in Jefferson County, Lake Tishomingo ranks #2 for water quality.
Source: EPA Water Quality Portal sampling records, Missouri DNR, last sampled 2024-08-13. Grade methodology: LakeQuality methodology.
Swimming conditions
Readings onlyModerate 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 Lake Tishomingo is safe to swim in today is a call for the Missouri Department of Natural Resources and the county health department, who post current advisories. LakeQuality does not issue swimming clearances.
Water quality measurements for Lake Tishomingo
These are the measurements Missouri DNR publishes for Lake Tishomingo, 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 5.4 ft. Phosphorus 23.5 µg/L. Chlorophyll-a 7.1 µg/L. TSI 51.
| Metric | Value | EPA condition class |
|---|---|---|
| Water Clarity (Secchi Depth) | 5.4 ft | Measured, not scored |
| Phosphorus | 23.5 µg/L | Fair |
| Chlorophyll-a (Algae) | 7.1 µg/L | Fair |
| Trophic State Index (TSI) | 51 | Eutrophic |
High nutrients, frequent algae, reduced clarity
Lake Details
| Characteristic | Value |
|---|---|
| Maximum Depth | ~31 ft est. |
| Average Depth | ~16 ft est. |
Depth marked “est.” is a modeled maximum from GLOBathy (Khazaei et al. 2022, CC0), not a measured survey. Missouri has not published bathymetry for Lake Tishomingo.
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.
Fishing Lake Tishomingo
Water Quality Trend: ↑ Improving
Based on 3 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Water Clarity | ↑ Improving | +1.54 m/yr | 2 |
| Phosphorus | ↑ Improving | -6.85 µg/L/yr | 3 |
| Chlorophyll-a | ↑ Improving | -3.65 µg/L/yr | 3 |
Nearby Lakes in Jefferson County
Frequently asked questions about Lake Tishomingo
Where is Lake Tishomingo?
- Lake Tishomingo is a lake in Jefferson County, Missouri. Its water-quality measurements are published by Missouri DNR and shown on this page as reported.
What is the water quality of Lake Tishomingo?
- Lake Tishomingo in Jefferson County, Missouri has water-quality measurements published by Missouri DNR, shown here as reported. Water clarity: 5.4 ft visibility. Phosphorus: 23.5 µg/L. Chlorophyll-a (algae): 7.1 µg/L.
Is Lake Tishomingo safe to swim in?
- Nutrient and algae readings are not a swimming clearance. Check local advisories before you swim.
How deep is Lake Tishomingo?
- No published bathymetric survey covers Lake Tishomingo, so its depth has not been measured. The HydroLAKES global model estimates an average depth of about 31 feet, but that is a modelled estimate derived from surrounding terrain rather than a measurement on the water, so treat it as approximate.
Explore Lake Tishomingo across LakeQuality
Planning a trip around Gateway Arch?
Lake Tishomingo is about 31 miles from Gateway Arch National Park. Crowds there swing hard by season, so the month you pick changes both how busy the park is and what lodging costs.
Best time to visit Gateway Arch →More lakes in Missouri
Other Lakes in Missouri
Eutrophic Lakes in Missouri
Where this data comes from
48 measurements from 1 monitoring station, 2022–2024. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- Univ. of Missouri, Columbia
UMC48 samples · 2022–2024
Analytical methods
- Depth, Secchi disk in meters
- 4500 P E ~ Phosphorus in Water by Colorimetry- Ascorbic Acid Method
- 445.0 ~ EPA; Chlorophyll and Pheophytin in Algae by Fluorescence
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
Lake size & watershed from HydroLAKES (HydroSHEDS)