Is Monroe City Lake B Nr. Dam Polluted?
Yes — Monroe City Lake B Nr. Dam in Monroe County, Missouri is on the EPA's Clean Water Act 303(d) impaired-waters list (2022 assessment cycle). It is cited for Algal growth. No cleanup plan (TMDL) has been completed yet. "Impaired" is a legal designation, separate from the lake's A–F water-quality grade: it means at least one designated use (such as swimming, aquatic life, or fish consumption) does not meet state standards for the listed pollutant.
EPA 303(d) Listing
| On 303(d) impaired list | Yes |
| Cleanup plan (TMDL) | Not yet written |
| Assessment cycle | 2022 |
| EPA IR category | 5 |
| Location | Monroe County, Missouri |
Pollutants Cited
- Algal growth — listed by EPA as exceeding water-quality standards for at least one designated use.
Specific parameters in the EPA record: CHLOROPHYLL-A.
What this means for using Monroe City Lake B Nr. Dam
Review the EPA assessment and any state advisories before relying on Monroe City Lake B Nr. Dam for swimming, fishing, or other uses. An impairment listing does not mean the lake is closed — most impaired lakes remain open for boating and swimming. It means a specific pollutant exceeds a standard for a specific use. Monroe City Lake B Nr. Dam carries an overall water-quality grade of C and phosphorus at 44 µg/L — see the full breakdown on the lake report. The official EPA assessment is available in the ATTAINS waterbody report.