Monroe City Lake B
Monroe County, MissouriView mapDirections
Missouri DNR publishes the water-quality measurements for Monroe City Lake B. Here is what has been measured.
- Impaired · Algal growth
- 35 ft max depth
- Limited data
Monroe City Lake B in Monroe County, Missouri has water-quality measurements published by Missouri DNR, shown here as reported. Phosphorus: 44 µg/L.
Monroe City Lake B is a lake in Monroe County, Missouri with an estimated average depth of about 35 feet.
Source: EPA Water Quality Portal sampling records, Missouri DNR, last sampled 2025-07-28. Methodology: how these readings are compared.
Swimming conditions
No readingLimited data
Nutrient and algae readings are not a swimming clearance. Monroe City Lake B is listed impaired under Clean Water Act §303(d) (IR 5) for algal growth. Check local advisories before you swim.
Whether Monroe City Lake B 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 Monroe City Lake B
These are the measurements Missouri DNR publishes for Monroe City Lake B, shown as reported. The condition class beside each reading is the EPA National Lakes Assessment class for this lake’s ecoregion.
No clarity data. Phosphorus 44 µg/L. TSI 59.
| Measure | Reading | Where it sits |
|---|---|---|
| Water clarity (Secchi depth) | No reading How deep a black-and-white disk stays visible from the surface. Higher is clearer. | |
| Total phosphorus | 44µg/L | Measured, not scored The nutrient that most limits algae growth in freshwater. More phosphorus, more algae potential. |
| Chlorophyll-a (algae) | No reading 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. | 59 | Eutrophic OligotrophicMesotrophicEutrophicHypereutrophic |
High nutrients, frequent algae, reduced clarity
Ask about Monroe City Lake B
Answers come straight from the public measurements and survey records on this page.
Lake Details
Max depth
~35 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 Monroe City Lake B.
Lake Size & Watershed
Watershed (drainage) area
6 sq mi
HydroLAKES / HydroSHEDS
Surface area
54 acres
HydroLAKES / HydroSHEDS
Shoreline
1.4 mi
HydroLAKES / HydroSHEDS
Elevation
705 ft
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.
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Fishing Monroe City Lake B
EPA Impairment Status
Monroe City Lake B is officially listed as impaired under Clean Water Act §303(d) in the 2022 EPA reporting cycle (IR category 5).
Causes of impairment
Designated uses not supporting: Aquatic life.
Source: EPA ATTAINS assessment unit MO_7034.00 · Official waterbody report
Nearby Lakes in Monroe County
Frequently asked questions about Monroe City Lake B
Where is Monroe City Lake B?
- Monroe City Lake B is a lake in Monroe County, Missouri. Its water-quality measurements are published by Missouri DNR and shown on this page as reported.
What is the water quality of Monroe City Lake B?
- Monroe City Lake B in Monroe County, Missouri has water-quality measurements published by Missouri DNR, shown here as reported. Phosphorus: 44 µg/L.
Is Monroe City Lake B safe to swim in?
- Nutrient and algae readings are not a swimming clearance. Monroe City Lake B is listed impaired under Clean Water Act §303(d) (IR 5) for algal growth. Check local advisories before you swim.
How deep is Monroe City Lake B?
- No published bathymetric survey covers Monroe City Lake B, so its depth has not been measured. The HydroLAKES global model estimates an average depth of about 35 feet, but that is a modelled estimate derived from surrounding terrain rather than a measurement on the water, so treat it as approximate.
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Where this data comes from
1 measurement from 1 monitoring station, 2025. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- Missouri Dept. of Natural Resources
MDNR1 sample · 2025
Analytical methods
- Nitrogen and Phosphorus, Total, Whole-water, Alkaline Persulfate Digest
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
Lake size & watershed from HydroLAKES (HydroSHEDS)