Jamesport City Lake is a 22-acre productive, nutrient-rich eutrophic lake in Daviess County, Missouri. Water quality is graded D based on 2 sampling years through 2024. Compared to the 1 other monitored lakes in Daviess County, Jamesport City Lake ranks #1 for water quality.
Source: EPA Water Quality Portal sampling records, Missouri DNR, last sampled 2024-05-23. Grade methodology: LakeGrade methodology.
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Swimming Safety
Swimming not recommended, poor water quality with high algae risk
Water Quality Grade: D, Poor
No clarity data. Phosphorus level: 147.7 µg/L. Chlorophyll-a: 15.5 µg/L. Trophic State Index: 67.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | No data | |
| Phosphorus | 147.7 µg/L | F |
| Chlorophyll-a (Algae) | 15.5 µg/L | C |
| Trophic State Index (TSI) | 67 | Eutrophic |
High nutrients, frequent algae, reduced clarity
Lake Details
| Characteristic | Value |
|---|---|
| Surface Area | 22 acres |
Where to stay near Jamesport City Lake
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Fishing Jamesport City Lake
Water Temperature
Jamesport City Lake averages about 79°F at the surface in summer, usually warmest in Jul (about 80°F) and coldest in May (about 74°F). These are typical values by month — not a live reading.
Typical surface water temperature by month, from 12 field readings (2013–2024) via the EPA Water Quality Portal. See the full Jamesport City Lake water temperature breakdown →
Location
County Ranking
Ranked #1 of 2 lakes in Daviess County
Cleaner Lakes Within 30 Miles
Jamesport City Lake holds Grade D. 2 nearby lakes hold higher grades.
- BNorth Bethany City ReservoirHarrison County · 25.2 mi · Two grade letters higher (D → B)
- DIndian Creek LakeLivingston County · 8.9 mi · Higher overall water quality score
Nearby Lakes in Daviess County
Explore Jamesport City Lake across LakeGrade
More Missouri Lake Rankings
Other Grade D Lakes in Missouri
Eutrophic Lakes in Missouri
More records, surveys & data sources
Reservoir Info (USACE NID)
Jamesport City Lake is a man-made reservoir impounded by the Jamesport City Lake Dam (completed 1955), built primarily for water supply on the TR-EAST BRUSHY CREEK; earth-type dam, 35 ft tall and 580 ft long.
- Surface area
- 22 ac
- Normal storage
- 385 ac-ft
- Max storage
- 385 ac-ft
- Drainage area
- 0.03 sq mi
- Hazard class
- Low
- Owner
- CITY OF JAMESPORT
Source: USACE National Inventory of Dams, NID ID MO10559 · Operator website
EPA Impairment Status
Jamesport City Lake 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_7104.00 · Official waterbody report
Regulated Pollution Sources Nearby
2 EPA-permitted facilities operate within about 5 miles of Jamesport City Lake under Clean Water Act (NPDES) discharge permits. 1 facility has a reported Clean Water Act violation in the past three years.
- Jamesport WwtfJamesport · 1.8 mi away · NPDES MO0087149Recent violation
- Yoder Sausage KitchenJamesport · 1 mi away · NPDES MONX00860
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.
Data Sources
Water quality data from the EPA Water Quality Portal
Impairment status from EPA ATTAINS 303(d) database
Regulated discharger data from EPA ECHO (ICIS-NPDES)
Grading methodology based on Metropolitan Council standards
Most recent sample: 2024-05-23
Monitoring stations: 1