Caesar Creek Lake is a 2,830-acre productive, nutrient-rich eutrophic lake in Warren County, Ohio. Water quality is graded D based on 3 sampling years through 2021. Overall water quality is declining over recent sampling years. Compared to the 3 other monitored lakes in Warren County, Caesar Creek Lake ranks #3 for water quality.
Source: EPA Water Quality Portal sampling records, Ohio DNR, last sampled 2021-10-18. Grade methodology: LakeGrade methodology.
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Caesar Creek Lake Water Quality Report Card (2026)
A printable one-page report card for Caesar Creek Lake: grade, clarity, phosphorus, algae, multi-year trend, depth, and fish — with sources.
Swimming Safety
Swimming not recommended, poor water quality with high algae risk
Water Quality Grade: D, Poor
Very murky, less than 3.2 ft of visibility. Phosphorus level: 26 µg/L. Chlorophyll-a: 20.1 µg/L. Trophic State Index: 57.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 3.2 ft | F |
| Phosphorus | 26 µg/L | B |
| Chlorophyll-a (Algae) | 20.1 µg/L | D |
| Trophic State Index (TSI) | 57 | Eutrophic |
High nutrients, frequent algae, reduced clarity
Lake Details
| Characteristic | Value |
|---|---|
| Surface Area | 2,830 acres |
Where to stay near Caesar Creek Lake
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Fishing Caesar Creek Lake
Water Quality Trend: ↓ Declining
Based on 2 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Water Clarity | ↑ Improving | +0.1 m/yr | 2 |
| Phosphorus | ↓ Declining | +5 µg/L/yr | 2 |
| Chlorophyll-a | ↓ Declining | +18.5 µg/L/yr | 2 |
Current Conditions
Latest reading Jul 6, 2026, 4:45 AM from USGS gauge 03242340. See live data ↗ — readings update every 15–60 minutes; this page refreshes on each build.
Location
County Ranking
Ranked #3 of 4 lakes in Warren County
Cleaner Lakes Within 30 Miles
Caesar Creek Lake holds Grade D. 2 nearby lakes hold higher grades.
- CCaesar Creek LakeWarren County · 1 mi · Higher grade (D → C)
- CCaesar Creek LakeWarren County · 2.3 mi · Higher grade (D → C)
Nearby Lakes in Warren County
Explore Caesar Creek Lake across LakeGrade
More Ohio Lake Rankings
Other Grade D Lakes in Ohio
Eutrophic Lakes in Ohio
Compare Caesar Creek Lake With Nearby Lakes
More records, surveys & data sources
Reservoir Info (USACE NID)
Caesar Creek Lake is a man-made reservoir impounded by the Caesar Creek Dam (completed 1976), built primarily for flood risk reduction on the CAESAR CREEK; rockfill-type dam, 180 ft tall and 2,650 ft long.
- Surface area
- 2,830 ac
- Normal storage
- 102,000 ac-ft
- Max storage
- 242,200 ac-ft
- Drainage area
- 237 sq mi
- Hazard class
- High
- Owner
- USACE - Louisville District
All listed purposes: Flood Risk Reduction;Other;Recreation;Water Supply.
Source: USACE National Inventory of Dams, NID ID OH00927 · Operator website
EPA Impairment Status
Caesar Creek Lake is officially listed as impaired under Clean Water Act §303(d) in the 2024 EPA reporting cycle (IR category 5).
Causes of impairment
A Total Maximum Daily Load (TMDL) plan has been approved.
Source: EPA ATTAINS assessment unit OH050902020406 · Official waterbody report · Matched by proximity (2.25 km)
Lake Size & Watershed
Size, shoreline, and watershed area from HydroLAKES (HydroSHEDS). Mean depth is a modeled estimate.
Regulated Pollution Sources Nearby
2 EPA-permitted facilities operate within about 5 miles of Caesar Creek Lake under Clean Water Act (NPDES) discharge permits. 2 facilities have a reported Clean Water Act violation in the past three years.
- Caesar Creek Flea MarketWilmington · 3.7 mi away · NPDES OH0072575Recent violation
- Shell Food MartWilmington · 4.2 mi away · NPDES OH0151633Recent violation
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)
Lake size & watershed from HydroLAKES (HydroSHEDS)
Grading methodology based on Metropolitan Council standards
Most recent sample: 2021-10-18
Monitoring stations: 1