Thomas Hill Lake @ Hwy T is a productive, nutrient-rich eutrophic lake in Macon County, Missouri. Water quality is graded C based on 2 sampling years through 2025. Limited fish-species data available. Public access is available with 2 public boat landings. Compared to the 3 other monitored lakes in Macon County, Thomas Hill Lake @ Hwy T ranks #2 for water quality.
Source: EPA Water Quality Portal sampling records, Missouri DNR, last sampled 2025-08-14. Grade methodology: LakeGrade methodology.
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Swimming Safety
Swim with caution, moderate algae may be present
Water Quality Grade: C, Fair
No clarity data. Phosphorus level: 51 µg/L. Chlorophyll-a: 21.4 µg/L. Trophic State Index: 61.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | No data | |
| Phosphorus | 51 µg/L | C |
| Chlorophyll-a (Algae) | 21.4 µg/L | D |
| Trophic State Index (TSI) | 61 | Eutrophic |
High nutrients, frequent algae, reduced clarity
Where to stay near Thomas Hill Lake @ Hwy T
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Top-rated places to stay near Thomas Hill Lake @ Hwy T
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Fishing Thomas Hill Lake @ Hwy T
Recreation & Access
Location
County Ranking
Ranked #2 of 4 lakes in Macon County
Cleaner Lakes Within 30 Miles
Thomas Hill Lake @ Hwy T holds Grade C. One nearby lake has a higher grade.
See full comparison →Nearby Lakes in Macon County
Explore Thomas Hill Lake @ Hwy T across LakeGrade
More Missouri Lake Rankings
Other Grade C Lakes in Missouri
Randolph County · Clarity: 3.6 ft
Randolph County · Clarity: 3.6 ft
Chariton County · Clarity: 3.5 ft
Adair County · Clarity: 2.3 ft
Adair County · Clarity: 3.6 ft
Adair County · Clarity: 2.8 ft
Eutrophic Lakes in Missouri
More records, surveys & data sources
EPA Impairment Status
Thomas Hill Lake @ Hwy T is officially listed as impaired under Clean Water Act §303(d) in the 2022 EPA reporting cycle (IR category 5).
Causes of impairment
Source: EPA ATTAINS assessment unit MO_7173.00 · Official waterbody report · Matched by proximity (1.42 km)
Lake Size & Watershed
Size, shoreline, and watershed area from HydroLAKES (HydroSHEDS). Mean depth is a modeled estimate.
Data Sources
Water quality data from the EPA Water Quality Portal
Impairment status from EPA ATTAINS 303(d) database
Lake size & watershed from HydroLAKES (HydroSHEDS)
Grading methodology based on Metropolitan Council standards
Public boat-access points from the USGS National Boat Ramps inventory
Most recent sample: 2025-08-14
Monitoring stations: 1