Vienna Correctional Center Lake is a 74-acre productive, nutrient-rich eutrophic lake in Johnson County, Illinois. Water quality is graded C based on 2 sampling years through 2020. Compared to the 1 other monitored lakes in Johnson County, Vienna Correctional Center Lake ranks #1 for water quality.
Source: EPA Water Quality Portal sampling records, Illinois DNR, last sampled 2020-11-05. Grade methodology: LakeGrade methodology.
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Swimming Safety
Generally safe for swimming, moderate water quality
Water Quality Grade: C, Fair
Murky, only visible to about 4.5 ft. Phosphorus level: 20 µg/L. Trophic State Index: 51.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 4.5 ft | D |
| Phosphorus | 20 µg/L | B |
| Chlorophyll-a (Algae) | No data | |
| Trophic State Index (TSI) | 51 | Eutrophic |
High nutrients, frequent algae, reduced clarity
Lake Details
| Characteristic | Value |
|---|---|
| Surface Area | 74 acres |
Where to stay near Vienna Correctional Center Lake
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Fishing Vienna Correctional Center Lake
Water Temperature
Vienna Correctional Center Lake averages about 77°F at the surface in summer, usually warmest in Aug (about 79°F) and coldest in Dec (about 48°F). These are typical values by month — not a live reading.
Typical surface water temperature by month, from 361 field readings (2010–2022) via the EPA Water Quality Portal. See the full Vienna Correctional Center Lake water temperature breakdown →
Location
County Ranking
Ranked #1 of 2 lakes in Johnson County
Cleaner Lakes Within 30 Miles
Vienna Correctional Center Lake holds Grade C. 3 nearby lakes hold higher grades.
- BGlendale LakePope County · 5.9 mi · Higher grade (C → B)
- BOne Horse Gap LakePope County · 19 mi · Higher grade (C → B)
- BTecumseh LakeHardin County · 24.8 mi · Higher grade (C → B)
Nearby Lakes in Johnson County
Explore Vienna Correctional Center Lake across LakeGrade
More Illinois Lake Rankings
Other Grade C Lakes in Illinois
Eutrophic Lakes in Illinois
More records, surveys & data sources
Reservoir Info (USACE NID)
Vienna Correctional Center Lake is a man-made reservoir impounded by the Vienna Correctional Center Lake Dam (completed 1964), built primarily for recreation on the TRIB BAY CREEK; earth-type dam, 29 ft tall and 680 ft long.
- Surface area
- 74 ac
- Normal storage
- 558 ac-ft
- Max storage
- 1,169 ac-ft
- Drainage area
- 1.5 sq mi
- Hazard class
- Low
- Owner
- ILLINOIS DEPARTMENT OF CORRECTIONS
All listed purposes: Recreation;Water Supply.
Source: USACE National Inventory of Dams, NID ID IL00028 · Operator website
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 Vienna Correctional Center Lake under Clean Water Act (NPDES) discharge permits. 1 facility has a reported Clean Water Act violation in the past three years.
- Vienna Correctional Center StpVienna · 0.3 mi away · NPDES IL0036757Recent violation
- Patrician Of Vienna Inc StpVienna · 3.2 mi away · NPDES IL0053660
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
Regulated discharger data from EPA ECHO (ICIS-NPDES)
Lake size & watershed from HydroLAKES (HydroSHEDS)
Grading methodology based on Metropolitan Council standards
Most recent sample: 2020-11-05
Monitoring stations: 3